Document per-app collective orders and the order's oauth_client_id

Collective orders are kept per app on Anikeen ID now: an app's subscriptions
are never billed on another app's order, even with the same group. Document
oauth_client_id on orders (Order property, app orders) and how legacy orders
that billed several apps appear (own lines only, invoice PDF refused with
403 invoice_includes_other_apps).

.github/workflows/tests.yml

@@ -0,0 +1,22 @@
+name: tests
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+
+jobs:
+  tests:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        php: ['8.3', '8.4']
+    steps:
+      - uses: actions/checkout@v6
+      - uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php }}
+          coverage: none
+      - run: composer update --no-interaction --prefer-dist --no-progress
+      - run: vendor/bin/phpunit

CLAUDE.md

@@ -0,0 +1,64 @@
+# CLAUDE.md
+
+Guidance for Claude Code (and other contributors) working in this repository.
+
+## What this is
+
+`anikeen/id` is the public PHP client for the Anikeen ID API, shipped as a Laravel package
+(Laravel 11–13, PHP 8.2+). It covers OAuth/Socialite login, an API token guard, and the billing
+API (subscriptions, orders, checkout sessions, shipments, invoices, webhooks). This is a public
+repo published on Packagist: never commit secrets, internal hostnames or customer data.
+
+## Commands
+
+```shell
+composer install
+composer test                                   # vendor/bin/phpunit
+vendor/bin/phpunit --filter AppSubscriptionsTest
+composer docs                                   # regenerate README.md from README.stub
+```
+
+CI (`.github/workflows/tests.yml`) runs PHPUnit on PHP 8.3 and 8.4.
+
+## Layout
+
+- `src/Id/AnikeenId.php` – the API client (singleton, facade `AnikeenId`). Reads
+  `config('services.anikeen.*')`; `mode=staging` switches to the staging base URL unless
+  `base_url` is set. `request()` wraps Guzzle and returns a `Result`.
+- `src/Id/Billable.php` – trait for the app's user model; composes the `Concerns/Manages*` traits.
+  Its API caches are declared properties on purpose (undeclared ones would be treated as Eloquent
+  attributes and break `save()`). Add a new cache property there when a concern caches.
+- `src/Id/Concerns/` – one trait per API area. Traits on `AnikeenId` act as the app/client;
+  traits on `Billable` act for one user.
+- `src/Id/Resources/` – `BaseResource` (single object) and `BaseCollection` (lists, built via
+  `::builder()`). Failed requests throw `ApiException::fromResult()` (`CollectionException` for
+  lists), no response `::unreachable()`, `confirmation_required` a `ConfirmationRequiredException`.
+  All extend `ResourceException`.
+- `src/Id/Resources/App*` – "app" variants that use the app's own client-credentials token
+  (`AnikeenId::asApp()`, `Support/AppRequest`) instead of the user's token, for trusted apps.
+  They must not send any request until a method is called.
+- `src/Id/Auth/`, `Providers/AnikeenIdServiceProvider.php`, `Http/Middleware/` – the `anikeen`
+  guard driver and user provider, JWT validation (`Helpers/JwtParser.php` with the bundled
+  `oauth-public*.key`), scope middleware.
+- `src/Id/Webhooks/` – signature verification (`Webhook::constructEvent`) and `EventType`
+  constants.
+- `src/Support/Query.php` – query-string builder.
+- `generator/generate-docs.php` – reflects the public methods of `AnikeenId` and `Billable` traits
+  into the README.
+
+## Conventions
+
+- **README:** edit `README.stub`, never `README.md` directly, then run `composer docs`. The
+  `<!-- GENERATED-DOCS -->` marker is replaced with the method reference. Commit both files.
+- **New endpoints:** add a method to the matching `Concerns/Manages*` trait (or a resource class),
+  document request attributes with an `array{…}` PHPDoc shape and a short description per key,
+  and add an example to `README.stub` when it is a new feature.
+- **Tests:** extend `Anikeen\Id\Tests\TestCase` (Orchestra Testbench). No live API: queue
+  responses with `$this->respond($status, $body)` (Guzzle `MockHandler`) and assert the sent
+  requests via `$this->sent` / `$this->sentJson($i)` – method, path, `Authorization` header and
+  JSON body. The app token is faked as `app-token`.
+- **Compatibility:** this is a library used by several apps. Keep public method signatures
+  backwards compatible; add optional parameters instead of changing existing ones.
+- Code, comments, docs and commit messages in English. Commit subjects are short, imperative,
+  sentence case (e.g. "Ship orders: shipments with delivery notes"). Work happens on feature
+  branches merged via PR into `main`.

composer.json

@@ -1,28 +1,30 @@
 {
   "name": "anikeen/id",
-  "description": "PHP AnikeenId API Client for Laravel 10+",
+  "description": "PHP Anikeen ID API client for Laravel 11+",
   "license": "MIT",
   "authors": [
     {
-      "name": "René Preuß",
+      "name": "Ren\u00e9 Preu\u00df",
       "email": "rene@anikeen.com"
     },
     {
-      "name": "Maurice Preuß",
+      "name": "Maurice Preu\u00df",
       "email": "maurice@anikeen.com"
     }
   ],
   "require": {
-    "php": "^8.0",
+    "php": "^8.2",
     "ext-json": "*",
-    "illuminate/support": "^11.0|^12.0",
-    "illuminate/console": "^11.0|^12.0",
-    "guzzlehttp/guzzle": "^6.3|^7.0",
-    "socialiteproviders/manager": "^3.4|^4.0.1",
-    "firebase/php-jwt": "^6.0"
+    "illuminate/support": "^12.69|^13.0",
+    "illuminate/console": "^12.69|^13.0",
+    "guzzlehttp/guzzle": "^7.8",
+    "socialiteproviders/manager": "^4.6",
+    "firebase/php-jwt": "^7.0"
   },
   "require-dev": {
-    "phpunit/phpunit": "^8.0|^9.0"
+    "laravel/framework": "^12.69|^13.0",
+    "orchestra/testbench": "^10.0|^11.0",
+    "phpunit/phpunit": "^11.0|^12.0"
   },
   "autoload": {
     "psr-4": {

generator/generate-docs.php

@@ -7,6 +7,20 @@ use Anikeen\Id\Billable;
 use Illuminate\Support\Arr;
 use Illuminate\Support\Str;
 
+// short type name incl. union, intersection and nullable types
+function typeName(ReflectionType $type): string
+{
+    if ($type instanceof ReflectionUnionType || $type instanceof ReflectionIntersectionType) {
+        $separator = $type instanceof ReflectionUnionType ? '|' : '&';
+
+        return collect($type->getTypes())->map(fn (ReflectionType $t) => typeName($t))->implode($separator);
+    }
+
+    $name = Arr::last(explode('\\', $type->getName()));
+
+    return ($type->allowsNull() && !in_array($name, ['mixed', 'null'], true) ? '?' : '') . $name;
+}
+
 // Liste der Klassen, die ausgewertet werden sollen
 $classes = [
     AnikeenId::class,
@@ -51,10 +65,7 @@ $allMarkdown = collect($classes)
                                 // Typ-Hint
                                 $typeHint = '';
                                 if ($p->hasType()) {
-                                    $type = $p->getType();
-                                    $nullable = $type->allowsNull() ? '?' : '';
-                                    $name     = Arr::last(explode('\\', $type->getName()));
-                                    $typeHint = $nullable . $name . ' ';
+                                    $typeHint = typeName($p->getType()) . ' ';
                                 }
 
                                 // Parameter-Name
@@ -84,10 +95,7 @@ $allMarkdown = collect($classes)
 
                         // Rückgabetyp, falls vorhanden
                         if ($method->hasReturnType()) {
-                            $retType  = $method->getReturnType();
-                            $nullable = $retType->allowsNull() ? '?' : '';
-                            $typeName = Arr::last(explode('\\', $retType->getName()));
-                            $decl    .= ': ' . $nullable . $typeName;
+                            $decl    .= ': ' . typeName($method->getReturnType());
                         }
 
                         return $decl;

oauth-public.staging.key

@@ -0,0 +1,14 @@
+-----BEGIN PUBLIC KEY-----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+-----END PUBLIC KEY-----

phpunit.xml

@@ -1,29 +1,16 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<phpunit bootstrap="vendor/autoload.php"
-         backupGlobals="false"
-         backupStaticAttributes="false"
-         colors="true"
-         verbose="true"
-         convertErrorsToExceptions="true"
-         convertNoticesToExceptions="true"
-         convertWarningsToExceptions="true"
-         processIsolation="false"
-         stopOnFailure="false"
-         printerClass="\Codedungeon\PHPUnitPrettyResultPrinter\Printer">
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:noNamespaceSchemaLocation="vendor/phpunit/phpunit/phpunit.xsd"
+         bootstrap="vendor/autoload.php"
+         colors="true">
     <testsuites>
         <testsuite name="Unit">
             <directory>tests</directory>
         </testsuite>
     </testsuites>
-    <filter>
-        <whitelist processUncoveredFilesFromWhitelist="true">
+    <source>
+        <include>
             <directory suffix=".php">src</directory>
-        </whitelist>
-    </filter>
-    <php>
-        <env name="ANIKEEN_ID_KEY" value="38"/>
-        <env name="ANIKEEN_ID_SECRET" value="2goNRF8x37HPVZVaa28ySZGVXJuksvxnxM7TcGzM"/>
-        <env name="ANIKEEN_ID_BASE_URL" value="https://id.anikeen.com/api/"/>
-        <env name="CLIENT_ACCESS_TOKEN" value="eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiJ9.eyJhdWQiOiIxNSIsImp0aSI6IjAxN2QxZDg0Y2MxNjAyZTYxOGZkNjYwZGViZWVjMDY4MTk2YmYzMDk1OGMzY2RiYzBjZmJkZWFjZjFhOTUxODQzZDU1YTk3OGY2YWIxY2YzIiwiaWF0IjoxNjY0NjIzMzA4LjQyODI4MSwibmJmIjoxNjY0NjIzMzA4LjQyODI4NCwiZXhwIjoxNjgwMzQ4MTA4LjQxNjc4MSwic3ViIjoiMzkiLCJzY29wZXMiOlsiYXBpIiwicmVhZF91c2VyIl0sImNsaWVudCI6eyJ0cnVzdGVkIjpmYWxzZX19.vxnzCaU4PpOrNVHa5AnGSS6gX_RCvxIERAnHFhjTrUzRafV9mr2Cvwd-BDVYoUr10wHvxa_TJSYfnAdDuhE-MEyDv13O3dL2XGTtJNa_Rg6L6CQ0JvC3wL-lWPvGPFax9pu-_lqbA3jm5B08hc3-7tq3f2nXcxjhtkqT6TTJv1-RCAppb2HCXiUDAqANzbhyInDjOH2WvFj1OGC_AI03J3W2KRWyeFLtUne8XKPFyr9XGcPuTrqogcuuXLeUt2kcf2bXbuIV1OlgIECrDiP1Ee0F2AzPs27ZVJ2z0R0JbT6AubKhGl5_Qi27cwjOH7hT2dmjcF1mLjzpN1uChLIdSnGSoStH8VzYHnHE2I8G-owW_aadG2UmGdnRY143q6g_28f3WIZNSucBSXkwFeS_t4fylsvpxhpjYJusf5qiEU_X3YbeawYMUCFUkSD2XTIypAqMJLNZQAeJ52eyL-9fln-Bv7n9v7K9G6ieR6Tm0tsJ1PRnaQi7rA1NTFwHoQmIOW9tfMycLzT7bgSoz3ra6Ez2J7ZNuWBZNKS0O-0YfSrAWyWK5U8YRfQuSVzP2VrIU63K6RGU2c284PfQGy11kgKUNQPykirb8p7MDQ8PwrxKaylBnD6hhDgjqEh2bfsr_43DfJA0R58L1HK3BmQnxgap0C77wK1e0yNlABpN28Q"/>
-    </php>
+        </include>
+    </source>
 </phpunit>

src/Id/AnikeenId.php

@@ -3,7 +3,11 @@
 namespace Anikeen\Id;
 
 use Anikeen\Id\Concerns\ManagesPricing;
+use Anikeen\Id\Concerns\ManagesProducts;
+use Anikeen\Id\Concerns\ManagesShippingLabels;
+use Anikeen\Id\Concerns\ManagesSocialiteUsers;
 use Anikeen\Id\Concerns\ManagesSshKeys;
+use Anikeen\Id\Concerns\ManagesUserBilling;
 use Anikeen\Id\Concerns\ManagesUsers;
 use Anikeen\Id\Exceptions\RequestRequiresAuthenticationException;
 use Anikeen\Id\Exceptions\RequestRequiresClientIdException;
@@ -20,6 +24,10 @@ class AnikeenId
 {
     use OauthTrait;
     use ManagesPricing;
+    use ManagesProducts;
+    use ManagesShippingLabels;
+    use ManagesUserBilling;
+    use ManagesSocialiteUsers;
     use ManagesSshKeys;
     use ManagesUsers;
 
@@ -46,11 +54,6 @@ class AnikeenId
      */
     public static bool $unserializesCookies = false;
 
-    /**
-     * The base URL for Anikeen ID API.
-     */
-    private static string $baseUrl = 'https://id.anikeen.com/api/';
-
     /**
      * The key for the access token.
      */
@@ -61,6 +64,8 @@ class AnikeenId
      */
     private static string $refreshTokenField = 'anikeen_id_refresh_token';
 
+    private static string $userIdField = 'anikeen_id';
+
     /**
      * Guzzle is used to make http requests.
      */
@@ -91,6 +96,16 @@ class AnikeenId
      */
     protected ?string $redirectUri = null;
 
+    /**
+     * The base URL for Anikeen ID.
+     */
+    protected string $baseUrl = 'https://id.anikeen.com';
+
+    /**
+     * The staging base URL for Anikeen ID.
+     */
+    protected string $stagingBaseUrl = 'https://staging.id.anikeen.com';
+
     /**
      * Constructor.
      */
@@ -105,22 +120,25 @@ class AnikeenId
         if ($redirectUri = config('services.anikeen.redirect')) {
             $this->setRedirectUri($redirectUri);
         }
+        if (self::getMode() === 'staging' && !config('services.anikeen.base_url')) {
+            self::setBaseUrl($this->stagingBaseUrl);
+        }
         if ($baseUrl = config('services.anikeen.base_url')) {
             self::setBaseUrl($baseUrl);
         }
         $this->client = new Client([
-            'base_uri' => self::$baseUrl,
+            'base_uri' => $this->baseUrl . '/api/',
         ]);
     }
 
-    /**
-     * @param string $baseUrl
-     *
-     * @internal only for internal and debug purposes.
-     */
-    public static function setBaseUrl(string $baseUrl): void
+    protected function setBaseUrl(string $baseUrl): void
     {
-        self::$baseUrl = $baseUrl;
+        $this->baseUrl = $baseUrl;
+    }
+
+    public function getBaseUrl(): string
+    {
+        return rtrim($this->baseUrl, '/');
     }
 
     public static function useAccessTokenField(string $accessTokenField): void
@@ -133,6 +151,46 @@ class AnikeenId
         return self::$accessTokenField;
     }
 
+    /**
+     * Attribute of the billable model that holds the user's Anikeen ID (used by app requests,
+     * e.g. appSubscriptions(), which act on behalf of a user without the user's token).
+     */
+    public static function useUserIdField(string $userIdField): void
+    {
+        self::$userIdField = $userIdField;
+    }
+
+    public static function getUserIdField(): string
+    {
+        return self::$userIdField;
+    }
+
+    /**
+     * A copy that uses the app's own access token (client credentials) instead of a user's token.
+     * The shared instance keeps its token, so app rights never leak into other requests.
+     *
+     * @throws Exceptions\RequestFreshAccessTokenException
+     */
+    public function asApp(): static
+    {
+        return (clone $this)->withToken(app(Contracts\AppTokenRepository::class)->getAccessToken());
+    }
+
+    /**
+     * Replace the HTTP client, e.g. with one using a Guzzle MockHandler in tests.
+     */
+    public function setHttpClient(Client $client): static
+    {
+        $this->client = $client;
+
+        return $this;
+    }
+
+    public static function getMode(): string
+    {
+        return config('services.anikeen.mode') ?: 'production';
+    }
+
     public static function useRefreshTokenField(string $refreshTokenField): void
     {
         self::$refreshTokenField = $refreshTokenField;
@@ -149,7 +207,7 @@ class AnikeenId
      * @param string|null $cookie
      * @return string|static
      */
-    public static function cookie(string $cookie = null): string|static
+    public static function cookie(?string $cookie = null): string|static
     {
         if (is_null($cookie)) {
             return static::$cookie;
@@ -314,7 +372,7 @@ class AnikeenId
      * @throws GuzzleException
      * @throws RequestRequiresClientIdException
      */
-    public function request(string $method, string $path, null|array $payload = null, array $parameters = [], Paginator $paginator = null): Result
+    public function request(string $method, string $path, null|array $payload = null, array $parameters = [], ?Paginator $paginator = null, bool $useClientSecret = false): Result
     {
         if ($paginator !== null) {
             $parameters[$paginator->action] = $paginator->cursor();
@@ -322,7 +380,7 @@ class AnikeenId
 
         try {
             $response = $this->client->request($method, $path, [
-                'headers' => $this->buildHeaders((bool)$payload),
+                'headers' => $this->buildHeaders((bool)$payload, $useClientSecret),
                 'query' => Query::build($parameters),
                 'json' => $payload ?: null,
             ]);
@@ -340,14 +398,15 @@ class AnikeenId
      *
      * @throws RequestRequiresClientIdException
      */
-    private function buildHeaders(bool $json = false): array
+    private function buildHeaders(bool $json = false, bool $useClientSecret = false): array
     {
         $headers = [
             'Client-ID' => $this->getClientId(),
             'Accept' => 'application/json',
         ];
-        if ($this->token) {
-            $headers['Authorization'] = 'Bearer ' . $this->token;
+        // public endpoints (products, order preview, …) work without a token
+        if ($bearerToken = $useClientSecret ? $this->getClientSecret() : $this->token) {
+            $headers['Authorization'] = 'Bearer ' . $bearerToken;
         }
         if ($json) {
             $headers['Content-Type'] = 'application/json';
@@ -360,7 +419,7 @@ class AnikeenId
      * @throws GuzzleException
      * @throws RequestRequiresClientIdException
      */
-    public function get(string $path, array $parameters = [], Paginator $paginator = null): Result
+    public function get(string $path, array $parameters = [], ?Paginator $paginator = null): Result
     {
         return $this->request('GET', $path, null, $parameters, $paginator);
     }
@@ -369,7 +428,7 @@ class AnikeenId
      * @throws GuzzleException
      * @throws RequestRequiresClientIdException
      */
-    public function post(string $path, array $payload = [], array $parameters = [], Paginator $paginator = null): Result
+    public function post(string $path, array $payload = [], array $parameters = [], ?Paginator $paginator = null): Result
     {
         return $this->request('POST', $path, $payload, $parameters, $paginator);
     }
@@ -378,7 +437,7 @@ class AnikeenId
      * @throws GuzzleException
      * @throws RequestRequiresClientIdException
      */
-    public function put(string $path, array $payload = [], array $parameters = [], Paginator $paginator = null): Result
+    public function put(string $path, array $payload = [], array $parameters = [], ?Paginator $paginator = null): Result
     {
         return $this->request('PUT', $path, $payload, $parameters, $paginator);
     }
@@ -387,7 +446,7 @@ class AnikeenId
      * @throws GuzzleException
      * @throws RequestRequiresClientIdException
      */
-    public function delete(string $path, array $payload = [], array $parameters = [], Paginator $paginator = null): Result
+    public function delete(string $path, array $payload = [], array $parameters = [], ?Paginator $paginator = null): Result
     {
         return $this->request('DELETE', $path, $payload, $parameters, $paginator);
     }

src/Id/ApiOperations/Delete.php

@@ -15,5 +15,5 @@ trait Delete
      * @throws RequestRequiresClientIdException
      * @throws GuzzleException
      */
-    abstract public function delete(string $path, array $payload = [], array $parameters = [], Paginator $paginator = null): Result;
+    abstract public function delete(string $path, array $payload = [], array $parameters = [], ?Paginator $paginator = null): Result;
 }

src/Id/ApiOperations/Get.php

@@ -15,5 +15,5 @@ trait Get
      * @throws RequestRequiresClientIdException
      * @throws GuzzleException
      */
-    abstract public function get(string $path, array $parameters = [], Paginator $paginator = null): Result;
+    abstract public function get(string $path, array $parameters = [], ?Paginator $paginator = null): Result;
 }

src/Id/ApiOperations/Post.php

@@ -15,5 +15,5 @@ trait Post
      * @throws RequestRequiresClientIdException
      * @throws GuzzleException
      */
-    abstract public function post(string $path, array $payload = [], array $parameters = [], Paginator $paginator = null): Result;
+    abstract public function post(string $path, array $payload = [], array $parameters = [], ?Paginator $paginator = null): Result;
 }

src/Id/ApiOperations/Put.php

@@ -15,5 +15,5 @@ trait Put
      * @throws RequestRequiresClientIdException
      * @throws GuzzleException
      */
-    abstract public function put(string $path, array $payload = [], array $parameters = [], Paginator $paginator = null): Result;
+    abstract public function put(string $path, array $payload = [], array $parameters = [], ?Paginator $paginator = null): Result;
 }

src/Id/ApiOperations/Request.php

@@ -15,5 +15,5 @@ trait Request
      * @throws RequestRequiresClientIdException
      * @throws GuzzleException
      */
-    abstract public function request(string $method, string $path, null|array $payload = null, array $parameters = [], Paginator $paginator = null): Result;
+    abstract public function request(string $method, string $path, null|array $payload = null, array $parameters = [], ?Paginator $paginator = null): Result;
 }

src/Id/Auth/TokenGuard.php

@@ -9,38 +9,39 @@ use Exception;
 use Firebase\JWT\JWT;
 use Firebase\JWT\Key;
 use Illuminate\Auth\AuthenticationException;
-use Illuminate\Auth\GuardHelpers;
-use Illuminate\Container\Container;
-use Illuminate\Contracts\Container\BindingResolutionException;
-use Illuminate\Contracts\Debug\ExceptionHandler;
+use Illuminate\Contracts\Auth\Authenticatable;
 use Illuminate\Contracts\Encryption\Encrypter;
 use Illuminate\Cookie\CookieValuePrefix;
 use Illuminate\Cookie\Middleware\EncryptCookies;
-use Illuminate\Foundation\Auth\User as Authenticatable;
 use Illuminate\Http\Request;
+use Illuminate\Support\Facades\Cache;
 use stdClass;
 use Throwable;
 
+/**
+ * Resolves the user of a request from an Anikeen ID access token (JWT, "Authorization: Bearer …")
+ * or from the encrypted token cookie of CreateFreshApiToken.
+ *
+ * A bearer token is verified with the JwtParser (signature, expiry). Its `sub` is the user's
+ * Anikeen ID, looked up by the provider (AnikeenIdUserProvider::retrieveByAnikeenId(), column
+ * `anikeen_id` by default). The token is attached to the user: `$user->anikeenTokenCan('scope')`.
+ *
+ * With `services.anikeen.verify_revocation` the token is also checked against Anikeen ID
+ * (GET v1/user, cached per token for `services.anikeen.revocation_cache_ttl` seconds), so
+ * revoked tokens stop working before they expire.
+ */
 class TokenGuard
 {
-    use GuardHelpers;
-
-    private Encrypter $encrypter;
-
-    private JwtParser $jwtParser;
-
-    public function __construct(UserProvider $provider, Encrypter $encrypter, JwtParser $jwtParser)
-    {
-        $this->provider = $provider;
-        $this->encrypter = $encrypter;
-        $this->jwtParser = $jwtParser;
+    public function __construct(
+        protected UserProvider $provider,
+        private Encrypter $encrypter,
+        private JwtParser $jwtParser
+    ) {
+        //
     }
 
     /**
      * Get the user for the incoming request.
-     *
-     * @throws BindingResolutionException
-     * @throws Throwable
      */
     public function user(Request $request): ?Authenticatable
     {
@@ -55,9 +56,6 @@ class TokenGuard
 
     /**
      * Authenticate the incoming request via the Bearer token.
-     *
-     * @throws BindingResolutionException
-     * @throws Throwable
      */
     protected function authenticateViaBearerToken(Request $request): ?Authenticatable
     {
@@ -65,51 +63,97 @@ class TokenGuard
             return null;
         }
 
-        // If the access token is valid we will retrieve the user according to the user ID
-        // associated with the token. We will use the provider implementation which may
-        // be used to retrieve users from Eloquent. Next, we'll be ready to continue.
-        /** @var Authenticatable|HasAnikeenTokens $user */
-        $user = $this->provider->retrieveById(
-            $request->attributes->get('oauth_user_id') ?: null
-        );
+        // client credentials tokens have no user
+        if (!is_scalar($token->sub ?? null) || (string) $token->sub === '') {
+            return null;
+        }
 
-        return $user?->withAnikeenAccessToken($token);
+        if (!$this->tokenIsActive($token, (string) $request->bearerToken())) {
+            return null;
+        }
 
+        /** @var Authenticatable|HasAnikeenTokens|null $user */
+        $user = $this->retrieveUser((string) $token->sub);
+
+        return $user && method_exists($user, 'withAnikeenAccessToken')
+            ? $user->withAnikeenAccessToken($token)
+            : $user;
     }
 
     /**
-     * Authenticate and get the incoming request via the Bearer token.
-     *
-     * @throws BindingResolutionException
-     * @throws Throwable
+     * Verify the Bearer token and expose its claims as request attributes.
      */
     protected function validateRequestViaBearerToken(Request $request): ?stdClass
     {
         try {
             $decoded = $this->jwtParser->decode($request);
-
-            $request->attributes->set('oauth_access_token_id', $decoded->jti);
-            $request->attributes->set('oauth_client_id', $decoded->aud);
-            $request->attributes->set('oauth_client_trusted', $decoded->client->trusted);
-            $request->attributes->set('oauth_user_id', $decoded->sub);
-            $request->attributes->set('oauth_scopes', $decoded->scopes);
-
-            return $decoded;
-        } catch (AuthenticationException $e) {
-            $request->headers->set('Authorization', '', true);
-
-            Container::getInstance()->make(
-                ExceptionHandler::class
-            )->report($e);
-
+        } catch (AuthenticationException) {
             return null;
         }
+
+        $decoded->scopes = array_values(array_filter((array) ($decoded->scopes ?? []), 'is_string'));
+
+        $request->attributes->set('oauth_access_token_id', $decoded->jti ?? null);
+        $request->attributes->set('oauth_client_id', $decoded->aud ?? null);
+        $request->attributes->set('oauth_client_trusted', $decoded->client->trusted ?? null);
+        $request->attributes->set('oauth_user_id', $decoded->sub ?? null);
+        $request->attributes->set('oauth_scopes', $decoded->scopes);
+
+        return $decoded;
+    }
+
+    /**
+     * Whether Anikeen ID still accepts the token (only with services.anikeen.verify_revocation).
+     */
+    protected function tokenIsActive(stdClass $token, string $jwt): bool
+    {
+        if (!config('services.anikeen.verify_revocation')) {
+            return true;
+        }
+
+        $key = 'anikeen-id:token-active:' . hash('sha256', $jwt);
+
+        if (($cached = Cache::get($key)) !== null) {
+            return (bool) $cached;
+        }
+
+        try {
+            $result = (clone app(AnikeenId::class))->withToken($jwt)->getAuthedUser();
+        } catch (Throwable) {
+            return false; // Anikeen ID unreachable: fail closed, ask again next time
+        }
+
+        $status = $result->response?->getStatusCode();
+
+        if ($result->success()) {
+            $active = true;
+        } elseif (in_array($status, [401, 403], true)) {
+            $active = false;
+        } else {
+            return false; // server error: fail closed without caching
+        }
+
+        $ttl = (int) config('services.anikeen.revocation_cache_ttl', 300);
+        if (isset($token->exp)) {
+            $ttl = max(1, min($ttl, (int) $token->exp - time()));
+        }
+        Cache::put($key, $active, $ttl);
+
+        return $active;
+    }
+
+    /**
+     * Find the local user of an Anikeen ID.
+     */
+    protected function retrieveUser(string $anikeenId): ?Authenticatable
+    {
+        return $this->provider->retrieveByAnikeenId($anikeenId);
     }
 
     /**
      * Authenticate the incoming request via the token cookie.
      */
-    protected function authenticateViaCookie(Request $request): mixed
+    protected function authenticateViaCookie(Request $request): ?Authenticatable
     {
         if (!$token = $this->getTokenViaCookie($request)) {
             return null;
@@ -118,9 +162,11 @@ class TokenGuard
         // If this user exists, we will return this user and attach a "transient" token to
         // the user model. The transient token assumes it has all scopes since the user
         // is physically logged into the application via the application's interface.
-        /** @var Authenticatable|HasAnikeenTokens $user */
-        if ($user = $this->provider->retrieveById($token['sub'])) {
-            return $user->withAnikeenAccessToken((object)['scopes' => ['*']]);
+        /** @var Authenticatable|HasAnikeenTokens|null $user */
+        if ($user = $this->retrieveUser((string) $token['sub'])) {
+            return method_exists($user, 'withAnikeenAccessToken')
+                ? $user->withAnikeenAccessToken((object) ['scopes' => ['*']])
+                : $user;
         }
 
         return null;
@@ -136,15 +182,18 @@ class TokenGuard
         // database. If we can't decrypt the value we'll bail out with a null return.
         try {
             $token = $this->decodeJwtTokenCookie($request);
-        } catch (Exception $e) {
+        } catch (Exception) {
+            return null;
+        }
+
+        if (!isset($token['sub'], $token['expiry'])) {
             return null;
         }
 
         // We will compare the CSRF token in the decoded API token against the CSRF header
         // sent with the request. If they don't match then this request isn't sent from
         // a valid source and we won't authenticate the request for further handling.
-        if (!AnikeenId::$ignoreCsrfToken && (!$this->validCsrf($token, $request) ||
-                time() >= $token['expiry'])) {
+        if (time() >= $token['expiry'] || (!AnikeenId::$ignoreCsrfToken && !$this->validCsrf($token, $request))) {
             return null;
         }
 
@@ -156,7 +205,7 @@ class TokenGuard
      */
     protected function decodeJwtTokenCookie(Request $request): array
     {
-        return (array)JWT::decode(
+        return (array) JWT::decode(
             CookieValuePrefix::remove($this->encrypter->decrypt($request->cookie(AnikeenId::cookie()), AnikeenId::$unserializesCookies)),
             new Key(
                 $this->encrypter->getKey(),
@@ -171,8 +220,8 @@ class TokenGuard
     protected function validCsrf(array $token, Request $request): bool
     {
         return isset($token['csrf']) && hash_equals(
-                $token['csrf'], $this->getTokenFromRequest($request)
-            );
+            $token['csrf'], $this->getTokenFromRequest($request)
+        );
     }
 
     /**
@@ -186,7 +235,7 @@ class TokenGuard
             $token = CookieValuePrefix::remove($this->encrypter->decrypt($header, static::serialized()));
         }
 
-        return $token;
+        return (string) $token;
     }
 
     /**

src/Id/Auth/UserProvider.php

@@ -2,6 +2,7 @@
 
 namespace Anikeen\Id\Auth;
 
+use Anikeen\Id\AnikeenId;
 use Illuminate\Contracts\Auth\Authenticatable;
 use Illuminate\Contracts\Auth\UserProvider as Base;
 
@@ -10,11 +11,33 @@ class UserProvider implements Base
     /**
      * Create a new AnikeenId user provider.
      */
-    public function __construct(protected Base $provider, protected string $providerName)
+    public function __construct(protected Base $provider, protected string $providerName, protected ?string $column = null)
     {
         //
     }
 
+    /**
+     * The column that holds a user's Anikeen ID: the provider's `column`, else
+     * `services.anikeen.user_id_column`, else AnikeenId::getUserIdField() (`anikeen_id`).
+     */
+    public function column(): string
+    {
+        return $this->column ?: (config('services.anikeen.user_id_column') ?: AnikeenId::getUserIdField());
+    }
+
+    /**
+     * Find the user of an Anikeen ID (the `sub` of an access token).
+     */
+    public function retrieveByAnikeenId(string $anikeenId): ?Authenticatable
+    {
+        if (method_exists($this->provider, 'retrieveByAnikeenId')) {
+            return $this->provider->retrieveByAnikeenId($anikeenId);
+        }
+
+        // eloquent / database providers: a plain where on the column
+        return $this->provider->retrieveByCredentials([$this->column() => $anikeenId]);
+    }
+
     /**
      * {@inheritdoc}
      */
@@ -65,6 +88,6 @@ class UserProvider implements Base
 
     public function rehashPasswordIfRequired(Authenticatable $user, #[\SensitiveParameter] array $credentials, bool $force = false)
     {
-        // TODO: Implement rehashPasswordIfRequired() method.
+        $this->provider->rehashPasswordIfRequired($user, $credentials, $force);
     }
 }

src/Id/Billable.php

@@ -2,57 +2,68 @@
 
 namespace Anikeen\Id;
 
-use Anikeen\Id\ApiOperations\Request;
+use Anikeen\Id\Concerns\ManagesAddresses;
 use Anikeen\Id\Concerns\ManagesBalance;
+use Anikeen\Id\Concerns\ManagesCountries;
 use Anikeen\Id\Concerns\ManagesInvoices;
 use Anikeen\Id\Concerns\ManagesOrders;
 use Anikeen\Id\Concerns\ManagesPaymentMethods;
+use Anikeen\Id\Concerns\ManagesProfile;
 use Anikeen\Id\Concerns\ManagesSubscriptions;
 use Anikeen\Id\Concerns\ManagesTaxation;
 use Anikeen\Id\Concerns\ManagesTransactions;
-use Anikeen\Id\Exceptions\RequestRequiresClientIdException;
-use Anikeen\Id\Helpers\Paginator;
-use GuzzleHttp\Exception\GuzzleException;
-use stdClass;
+use Anikeen\Id\Concerns\ManagesUserSshKeys;
+use Throwable;
 
 trait Billable
 {
+    use ManagesAddresses;
     use ManagesBalance;
+    use ManagesCountries;
     use ManagesInvoices;
     use ManagesOrders;
     use ManagesPaymentMethods;
+    use ManagesProfile;
     use ManagesSubscriptions;
     use ManagesTaxation;
     use ManagesTransactions;
-    use Request;
+    use ManagesUserSshKeys;
 
-    protected stdClass|null $userData = null;
+    /*
+     * API results cached per instance. Declared, so Eloquent models don't take them for
+     * attributes (an undeclared property goes through Model::__set and save() then fails
+     * with "no such column").
+     */
+    protected mixed $addressesCache = null;
+    protected mixed $countriesCache = null;
+    protected mixed $defaultPaymentMethodCache = null;
+    protected mixed $invoicesCache = null;
+    protected mixed $ordersCache = null;
+    protected mixed $paymentMethodsCache = null;
+    protected mixed $subscriptionsCache = null;
+    protected mixed $transactionsCache = null;
+    protected mixed $userDataCache = null;
 
     /**
      * Get the currently authenticated user.
      *
-     * @throws RequestRequiresClientIdException
-     * @throws GuzzleException
+     * @throws Throwable
      */
-    protected function getUserData(): stdClass
+    public function getUserData(): object
     {
-        if (!$this->userData) {
-            $this->userData = $this->request('GET', 'v1/user')->data;
+        if (!isset($this->userDataCache)) {
+            $this->userDataCache = $this->anikeenId()->request('GET', 'v1/user')->data;
         }
-        return $this->userData;
+        return $this->userDataCache;
     }
 
     /**
-     * Make a request to the Anikeen API.
+     * Get the AnikeenId class.
      *
-     * @throws RequestRequiresClientIdException
-     * @throws GuzzleException
+     * @throws Throwable
      */
-    protected function request(string $method, string $path, null|array $payload = null, array $parameters = [], Paginator $paginator = null): Result
+    public function anikeenId(): AnikeenId
     {
-        $anikeenId = new AnikeenId();
-        $anikeenId->withToken($this->{AnikeenId::getAccessTokenField()});
-
-        return $anikeenId->request($method, $path, $payload, $parameters, $paginator);
+        return app(AnikeenId::class)->withToken($this->{AnikeenId::getAccessTokenField()});
     }
 }

src/Id/Concerns/HasBillable.php

@@ -0,0 +1,23 @@
+<?php
+
+namespace Anikeen\Id\Concerns;
+
+use Anikeen\Id\Contracts\Billable;
+use Illuminate\Database\Eloquent\Model;
+
+trait HasBillable
+{
+    public Billable|Model $billable;
+
+    public function setBillable(Billable|Model $billable): self
+    {
+        $this->billable = $billable;
+
+        return $this;
+    }
+
+    public function getBillable(): Billable
+    {
+        return $this->billable;
+    }
+}

src/Id/Concerns/HasConfirmationUrl.php

@@ -0,0 +1,27 @@
+<?php
+
+namespace Anikeen\Id\Concerns;
+
+/**
+ * Orders and subscriptions created by third-party apps are confirmed by the user on Anikeen ID.
+ */
+trait HasConfirmationUrl
+{
+    /**
+     * Where the user confirms (or cancels) this booking, or null once it was checked out.
+     *
+     * Afterwards the user is sent back to $returnUrl with `status` (completed, pending or
+     * cancelled) and `order` or `subscription`. The return URL must have the origin of one of
+     * the app's redirect URIs. Check the status through the API; don't trust the query string.
+     */
+    public function confirmationUrl(?string $returnUrl = null): ?string
+    {
+        $url = $this->confirmation_url ?? null;
+
+        if (!$url || !$returnUrl) {
+            return $url ?: null;
+        }
+
+        return $url . (str_contains($url, '?') ? '&' : '?') . http_build_query(['return_url' => $returnUrl]);
+    }
+}

src/Id/Concerns/HasParent.php

@@ -0,0 +1,20 @@
+<?php
+
+namespace Anikeen\Id\Concerns;
+
+trait HasParent
+{
+    protected mixed $parent;
+
+    public function setParent(mixed $parent): self
+    {
+        $this->parent = $parent;
+
+        return $this;
+    }
+
+    public function getParent()
+    {
+        return $this->parent;
+    }
+}

src/Id/Concerns/HasSubscriptionStatus.php

@@ -0,0 +1,90 @@
+<?php
+
+namespace Anikeen\Id\Concerns;
+
+use Anikeen\Id\Enums\SubscriptionStatus;
+
+/**
+ * The state of a subscription, derived from its fields the same way Anikeen ID derives `status`
+ * (so it also works with responses that only carry the fields).
+ */
+trait HasSubscriptionStatus
+{
+    /**
+     * One of the SubscriptionStatus constants: draft, trial, active, paused, cancelling, expired
+     * or cancelled.
+     */
+    public function status(): string
+    {
+        $active = (bool) $this->active;
+        $started = !empty($this->starts_at);
+
+        return match (true) {
+            (bool) $this->cancelled => SubscriptionStatus::CANCELLED,
+            !$active && !$started => SubscriptionStatus::DRAFT,
+            $active && !empty($this->cancels_at) => SubscriptionStatus::CANCELLING,
+            $active && !$this->autorenew => SubscriptionStatus::PAUSED,
+            $active && !empty($this->trial_ends_at) && strtotime($this->trial_ends_at) > time() => SubscriptionStatus::TRIAL,
+            $active => SubscriptionStatus::ACTIVE,
+            !$this->autorenew && $started => SubscriptionStatus::EXPIRED,
+            default => SubscriptionStatus::INACTIVE,
+        };
+    }
+
+    /**
+     * Not checked out or confirmed yet (third-party apps: send the user to confirmationUrl()).
+     */
+    public function isDraft(): bool
+    {
+        return $this->status() === SubscriptionStatus::DRAFT;
+    }
+
+    /**
+     * Running and paid: active, in trial, paused or with a scheduled cancellation. Grant access
+     * while this is true.
+     */
+    public function isActive(): bool
+    {
+        return in_array($this->status(), [SubscriptionStatus::TRIAL, SubscriptionStatus::ACTIVE, SubscriptionStatus::PAUSED, SubscriptionStatus::CANCELLING], true);
+    }
+
+    /**
+     * In its free trial: running, nothing billed until trial_ends_at.
+     */
+    public function isTrial(): bool
+    {
+        return $this->status() === SubscriptionStatus::TRIAL;
+    }
+
+    /**
+     * Paused: runs until the paid period ends, then expires (resume() to continue).
+     */
+    public function isPaused(): bool
+    {
+        return $this->status() === SubscriptionStatus::PAUSED;
+    }
+
+    /**
+     * Running until a scheduled cancellation takes effect.
+     */
+    public function isCancelling(): bool
+    {
+        return $this->status() === SubscriptionStatus::CANCELLING;
+    }
+
+    /**
+     * Paused and ran out: resume() starts a new period.
+     */
+    public function isExpired(): bool
+    {
+        return $this->status() === SubscriptionStatus::EXPIRED;
+    }
+
+    /**
+     * Cancelled for good.
+     */
+    public function isCancelled(): bool
+    {
+        return $this->status() === SubscriptionStatus::CANCELLED;
+    }
+}

src/Id/Concerns/IsCheckoutSession.php

@@ -0,0 +1,50 @@
+<?php
+
+namespace Anikeen\Id\Concerns;
+
+/**
+ * Reading a checkout session (see AppCheckoutSession and CheckoutSession).
+ */
+trait IsCheckoutSession
+{
+    /**
+     * Where the user confirms (or cancels) all of the session's subscriptions, or null once the
+     * session is no longer open. The user then returns to the session's `return_url` with
+     * `status` (completed or cancelled when confirming or cancelling; expired only from the
+     * "back to app" link of a session that had expired) and `checkout_session` (the id). Check the
+     * status through the API or the checkout.* webhooks; don't trust the query string.
+     */
+    public function confirmationUrl(): ?string
+    {
+        return $this->confirmation_url ?: null;
+    }
+
+    public function isOpen(): bool
+    {
+        return $this->status === self::STATUS_OPEN;
+    }
+
+    /**
+     * Confirmed: all of its subscriptions are running.
+     */
+    public function isCompleted(): bool
+    {
+        return $this->status === self::STATUS_COMPLETED;
+    }
+
+    /**
+     * Cancelled or expired: all of its drafts were cancelled.
+     */
+    public function isCancelled(): bool
+    {
+        return in_array($this->status, [self::STATUS_CANCELLED, self::STATUS_EXPIRED], true);
+    }
+
+    /**
+     * @return list<string>
+     */
+    public function subscriptionIds(): array
+    {
+        return array_values((array) ($this->subscription_ids ?? []));
+    }
+}

src/Id/Concerns/ManagesAddresses.php

@@ -0,0 +1,38 @@
+<?php
+
+namespace Anikeen\Id\Concerns;
+
+use Anikeen\Id\Resources\Addresses;
+use Throwable;
+
+trait ManagesAddresses
+{
+    use HasBillable;
+
+    /**
+     * Get addresses from the current user.
+     *
+     * @throws Throwable
+     */
+    public function addresses(): Addresses
+    {
+        if (!isset($this->addressesCache)) {
+            $this->addressesCache = Addresses::builder(fn() => $this->anikeenId()
+                ->request('GET', 'v1/addresses'))
+                ->setBillable($this);
+        }
+
+        return $this->addressesCache;
+    }
+
+    /**
+     * Check if the current user has a default billing address.
+     *
+     * @throws Throwable
+     * @see \Anikeen\Id\Resources\Addresses::hasDefaultBillingAddress()
+     */
+    public function hasDefaultBillingAddress(): bool
+    {
+        return $this->addresses()->hasDefaultBillingAddress();
+    }
+}

src/Id/Concerns/ManagesBalance.php

@@ -2,20 +2,17 @@
 
 namespace Anikeen\Id\Concerns;
 
-use Anikeen\Id\ApiOperations\Request;
-use Anikeen\Id\Exceptions\RequestRequiresClientIdException;
-use Anikeen\Id\Result;
-use GuzzleHttp\Exception\GuzzleException;
+use Anikeen\Id\Resources\Transaction;
+use Throwable;
 
 trait ManagesBalance
 {
-    use Request;
+    use HasBillable;
 
     /**
      * Get balance from the current user.
      *
-     * @throws RequestRequiresClientIdException
-     * @throws GuzzleException
+     * @throws Throwable
      */
     public function balance(): float
     {
@@ -25,8 +22,7 @@ trait ManagesBalance
     /**
      * Get charges from the current user.
      *
-     * @throws RequestRequiresClientIdException
-     * @throws GuzzleException
+     * @throws Throwable
      */
     public function charges(): float
     {
@@ -34,20 +30,31 @@ trait ManagesBalance
     }
 
     /**
-     * Charge given amount from bank to current user.
+     * Billing overview of the current user: current_balance, current_charges, vat_rate,
+     * has_billing_address, has_default_payment_method, open_orders.
      *
-     * @param float $amount Amount to charge in euros.
-     * @param string $paymentMethodId Payment method ID.
-     * @param array $options Additional options for the charge.
-     * @throws RequestRequiresClientIdException
-     * @throws GuzzleException
+     * @throws Throwable
      */
-    public function charge(float $amount, string $paymentMethodId, array $options = []): Result
+    public function billingOverview(): object
     {
-        return $this->request('POST', 'billing/charge', [
-            'amount' => $amount,
-            'payment_method_id' => $paymentMethodId,
-            'options' => $options,
-        ]);
+        return $this->anikeenId()->request('GET', 'v1/billing')->data;
+    }
+
+    /**
+     * Charge given amount (deposit) from one of the current user's payment methods.
+     *
+     * @param float|string $amount Amount in euros (0.50 to 10,000, at most 2 decimals).
+     * @param string $paymentMethodId Stripe payment method ID (pm_…).
+     * @param array $options Ignored; Stripe options can no longer be passed through.
+     * @throws Throwable
+     */
+    public function charge(float|string $amount, string $paymentMethodId, array $options = []): Transaction
+    {
+        return (new Transaction(fn() => $this->anikeenId()
+            ->request('POST', 'v1/billing/charge', [
+                'amount' => $amount,
+                'payment_method_id' => $paymentMethodId,
+            ])))
+            ->setBillable($this);
     }
 }

src/Id/Concerns/ManagesCountries.php

@@ -0,0 +1,27 @@
+<?php
+
+namespace Anikeen\Id\Concerns;
+
+use Anikeen\Id\Resources\Countries;
+use Throwable;
+
+trait ManagesCountries
+{
+    use HasBillable;
+
+    /**
+     * Get available countries for the current user.
+     *
+     * @throws Throwable
+     */
+    public function countries(): Countries
+    {
+        if (!isset($this->countriesCache)) {
+            $this->countriesCache = Countries::builder(fn() => $this->anikeenId()
+                ->request('GET', 'v1/countries'))
+                ->setBillable($this);
+        }
+
+        return $this->countriesCache;
+    }
+}

src/Id/Concerns/ManagesInvoices.php

@@ -2,47 +2,26 @@
 
 namespace Anikeen\Id\Concerns;
 
-use Anikeen\Id\ApiOperations\Request;
-use Anikeen\Id\Exceptions\RequestRequiresClientIdException;
-use Anikeen\Id\Result;
-use GuzzleHttp\Exception\GuzzleException;
+use Anikeen\Id\Resources\Invoices;
+use Throwable;
 
 trait ManagesInvoices
 {
-    use Request;
+    use HasBillable;
 
     /**
      * Get invoices from the current user.
      *
-     * @throws RequestRequiresClientIdException
-     * @throws GuzzleException
+     * @throws Throwable
      */
-    public function invoices(): Result
+    public function invoices(array $parameters = []): Invoices
     {
-        return $this->request('GET', 'v1/invoices');
-    }
+        if (!isset($this->invoicesCache)) {
+            $this->invoicesCache = Invoices::builder(fn() => $this->anikeenId()
+                ->request('GET', 'v1/invoices', [], $parameters))
+                ->setBillable($this);
+        }
 
-    /**
-     * Get given invoice from the current user.
-     *
-     * @param string $invoiceId The invoice ID
-     * @throws RequestRequiresClientIdException
-     * @throws GuzzleException
-     */
-    public function invoice(string $invoiceId): Result
-    {
-        return $this->request('GET', sprintf('v1/invoices/%s', $invoiceId));
-    }
-
-    /**
-     * Get download url from given invoice.
-     *
-     * @param string $invoiceId The invoice ID
-     * @throws RequestRequiresClientIdException
-     * @throws GuzzleException
-     */
-    public function getInvoiceDownloadUrl(string $invoiceId): string
-    {
-        return $this->request('PUT', sprintf('v1/invoices/%s', $invoiceId))->data->download_url;
+        return $this->invoicesCache;
     }
 }

src/Id/Concerns/ManagesOrders.php

@@ -2,259 +2,26 @@
 
 namespace Anikeen\Id\Concerns;
 
-use Anikeen\Id\ApiOperations\Request;
-use Anikeen\Id\Exceptions\RequestRequiresClientIdException;
-use Anikeen\Id\Result;
-use GuzzleHttp\Exception\GuzzleException;
+use Anikeen\Id\Resources\Orders;
+use Throwable;
 
 trait ManagesOrders
 {
-    use Request;
+    use HasBillable;
 
     /**
      * Get orders from the current user.
      *
-     * @throws RequestRequiresClientIdException
-     * @throws GuzzleException
+     * @throws Throwable
      */
-    public function orders(): Result
+    public function orders(array $parameters = []): Orders
     {
-        return $this->request('GET', 'v1/orders');
-    }
+        if (!isset($this->ordersCache)) {
+            $this->ordersCache = Orders::builder(fn() => $this->anikeenId()
+                ->request('GET', 'v1/orders', [], $parameters))
+                ->setBillable($this);
+        }
 
-    /**
-     * Creates a new order for the current user.
-     *
-     * VAT is calculated based on the billing address and shown in the order response.
-     *
-     * @param array{
-     *     billing_address: array{
-     *          company_name: null|string,
-     *          first_name:  null|string,
-     *          last_name: null|string,
-     *          address: null|string,
-     *          address_2: null|string,
-     *          house_number: null|string,
-     *          city: null|string,
-     *          state: null|string,
-     *          postal_code: null|string,
-     *          country_iso: string,
-     *          phone_number: null|string,
-     *          email: null|string
-     *     },
-     *     shipping_address: null|array{
-     *          company_name: null|string,
-     *          first_name:  string,
-     *          last_name: string,
-     *          address: null|string,
-     *          address_2: string,
-     *          house_number: null|string,
-     *          city: string,
-     *          state: string,
-     *          postal_code: string,
-     *          country_iso: string,
-     *          phone_number: null|string,
-     *          email: null|string
-     *     },
-     *     items: array<array{
-     *         type:        string,
-     *         name:        string,
-     *         description: string,
-     *         price:       float|int,
-     *         unit:        string,
-     *         units:       int
-     *     }>
-     * } $attributes The order data:
-     *   - billing_address:  Billing address (ISO 3166-1 alpha-2 country code)
-     *   - shipping_address: Shipping address (first name, last name, ISO 3166-1 alpha-2 country code)
-     *   - items:            Array of order items (each with type, name, price, unit, units, and quantity)
-     * @throws RequestRequiresClientIdException
-     * @throws GuzzleException
-     */
-    public function createOrder(array $attributes = []): Result
-    {
-        return $this->request('POST', 'v1/orders', $attributes);
-    }
-
-    /**
-     * Get given order from the current user.
-     *
-     * @throws RequestRequiresClientIdException
-     * @throws GuzzleException
-     */
-    public function order(string $orderId): Result
-    {
-        return $this->request('GET', sprintf('v1/orders/%s', $orderId));
-    }
-
-    /**
-     * Update given order from the current user.
-     *
-     * VAT is calculated based on the billing address and shown in the order response.
-     *
-     * @param string $orderId The order ID.
-     * @param array{
-     *      billing_address: array{
-     *           company_name: null|string,
-     *           first_name:  null|string,
-     *           last_name: null|string,
-     *           address: null|string,
-     *           address_2: null|string,
-     *           house_number: null|string,
-     *           city: null|string,
-     *           state: null|string,
-     *           postal_code: null|string,
-     *           country_iso: string,
-     *           phone_number: null|string,
-     *           email: null|string
-     *      },
-     *      shipping_address: null|array{
-     *           company_name: null|string,
-     *           first_name:  string,
-     *           last_name: string,
-     *           address: null|string,
-     *           address_2: string,
-     *           house_number: null|string,
-     *           city: string,
-     *           state: string,
-     *           postal_code: string,
-     *           country_iso: string,
-     *           phone_number: null|string,
-     *           email: null|string
-     *      }
-     *  } $attributes The order data:
-     *    - billing_address:  Billing address (ISO 3166-1 alpha-2 country code)
-     *    - shipping_address: Shipping address (first name, last name, ISO 3166-1 alpha-2 country code)
-     * @throws RequestRequiresClientIdException
-     * @throws GuzzleException
-     */
-    public function updateOrder(string $orderId, array $attributes = []): Result
-    {
-        return $this->request('PUT', sprintf('v1/orders/%s', $orderId), $attributes);
-    }
-
-    /**
-     * Checkout given order from the current user.
-     *
-     * @param string $orderId The order ID.
-     * @throws RequestRequiresClientIdException
-     * @throws GuzzleException
-     */
-    public function checkoutOrder(string $orderId): Result
-    {
-        return $this->request('PUT', sprintf('v1/orders/%s/checkout', $orderId));
-    }
-
-    /**
-     * Revoke given order from the current user.
-     *
-     * @param string $orderId The order ID.
-     * @throws RequestRequiresClientIdException
-     * @throws GuzzleException
-     */
-    public function revokeOrder(string $orderId): Result
-    {
-        return $this->request('PUT', sprintf('v1/orders/%s/revoke', $orderId));
-    }
-
-    /**
-     * Delete given order from the current user.
-     *
-     * @param string $orderId The order ID.
-     * @throws RequestRequiresClientIdException
-     * @throws GuzzleException
-     */
-    public function deleteOrder(string $orderId): Result
-    {
-        return $this->request('DELETE', sprintf('v1/orders/%s', $orderId));
-    }
-
-    /**
-     * Get order items from given order.
-     *
-     * @param string $orderId The order ID.
-     * @throws RequestRequiresClientIdException
-     * @throws GuzzleException
-     */
-    public function orderItems(string $orderId): Result
-    {
-        return $this->request('GET', sprintf('v1/orders/%s/items', $orderId));
-    }
-
-    /**
-     * Create a new order item for given order.
-     *
-     * VAT is calculated based on the billing address and shown in the order item response.
-     *
-     * @param string $orderId The order ID.
-     * @param array{
-     *      items: array<array{
-     *          type:        string,
-     *          name:        string,
-     *          description: string,
-     *          price:       float|int,
-     *          unit:        string,
-     *          units:       int
-     *      }>
-     *  } $attributes The order data:
-     *    - items:           Array of order items, each with type, name, description, price, unit, and quantity
-     * @throws RequestRequiresClientIdException
-     * @throws GuzzleException
-     */
-    public function createOrderItem(string $orderId, array $attributes = []): Result
-    {
-        return $this->request('POST', sprintf('v1/orders/%s', $orderId), $attributes);
-    }
-
-    /**
-     * Get given order item from given order.
-     *
-     * @param string $orderId The order ID.
-     * @param string $orderItemId The order item ID.
-     * @throws RequestRequiresClientIdException
-     * @throws GuzzleException
-     */
-    public function orderItem(string $orderId, string $orderItemId): Result
-    {
-        return $this->request('GET', sprintf('v1/orders/%s/items/%s', $orderId, $orderItemId));
-    }
-
-    /**
-     * Update given order item from given order.
-     *
-     * VAT is calculated based on the billing address and shown in the order item response.
-     *
-     * @param string $orderId The order ID.
-     * @param string $orderItemId The order item ID.
-     * @param array{
-     *       items: array<array{
-     *           type:        string,
-     *           name:        string,
-     *           description: string,
-     *           price:       float|int,
-     *           unit:        string,
-     *           units:       int
-     *       }>
-     *   } $attributes The order data:
-     *     - items:           Array of order items, each with type, name, description, price, unit, and quantity
-     * @throws RequestRequiresClientIdException
-     * @throws GuzzleException
-     */
-    public function updateOrderItem(string $orderId, string $orderItemId, array $attributes = []): Result
-    {
-        return $this->request('PUT', sprintf('v1/orders/%s/items/%s', $orderId, $orderItemId), $attributes);
-    }
-
-    /**
-     * Delete given order item from given order.
-     *
-     * @param string $orderId The order ID.
-     * @param string $orderItemId The order item ID.
-     * @throws RequestRequiresClientIdException
-     * @throws GuzzleException
-     */
-    public function deleteOrderItem(string $orderId, string $orderItemId): Result
-    {
-        return $this->request('DELETE', sprintf('v1/orders/%s/items/%s', $orderId, $orderItemId));
+        return $this->ordersCache;
     }
 }

src/Id/Concerns/ManagesPaymentMethods.php

@@ -2,86 +2,106 @@
 
 namespace Anikeen\Id\Concerns;
 
-use Anikeen\Id\ApiOperations\Request;
-use Anikeen\Id\Exceptions\RequestRequiresClientIdException;
+use Anikeen\Id\Resources\PaymentMethod;
+use Anikeen\Id\Resources\PaymentMethods;
 use Anikeen\Id\Result;
-use GuzzleHttp\Exception\GuzzleException;
+use Throwable;
 
 trait ManagesPaymentMethods
 {
-    use Request;
-
-    /**
-     * Check if current user has at least one payment method.
-     *
-     * @throws RequestRequiresClientIdException
-     * @throws GuzzleException
-     */
-    public function hasPaymentMethod(): bool
-    {
-        return $this->paymentMethods()->count() > 0;
-    }
+    use HasBillable;
 
     /**
      * Get payment methods from the current user.
      *
-     * @throws RequestRequiresClientIdException
-     * @throws GuzzleException
+     * @throws Throwable
      */
-    public function paymentMethods(): Result
+    public function paymentMethods(): PaymentMethods
     {
-        return $this->request('GET', 'v1/payment-methods');
+        if (!isset($this->paymentMethodsCache)) {
+            $this->paymentMethodsCache = PaymentMethods::builder(fn() => $this->anikeenId()
+                ->request('GET', 'v1/payment-methods'))
+                ->setBillable($this);
+        }
+
+        return $this->paymentMethodsCache;
+    }
+
+    /**
+     * Check if current user has at least one payment method.
+     *
+     * @throws Throwable
+     * @see \Anikeen\Id\Resources\PaymentMethods::hasPaymentMethod()
+     */
+    public function hasPaymentMethod(): ?PaymentMethod
+    {
+        return $this->paymentMethods()->hasPaymentMethod();
     }
 
     /**
      * Get default payment method from the current user.
      *
-     * @throws RequestRequiresClientIdException
-     * @throws GuzzleException
+     * @throws Throwable
+     * @see \Anikeen\Id\Resources\PaymentMethods::defaultPaymentMethod()
+     */
+    public function defaultPaymentMethod(): ?PaymentMethod
+    {
+        return $this->paymentMethods()->defaultPaymentMethod();
+    }
+
+    /**
+     * Check if the current user has a default payment method.
+     *
+     * @throws Throwable
+     * @see \Anikeen\Id\Resources\PaymentMethods::hasDefaultPaymentMethod()
      */
     public function hasDefaultPaymentMethod(): bool
     {
-        return $this->defaultPaymentMethod()->count() > 0;
+        return $this->paymentMethods()->hasDefaultPaymentMethod();
     }
 
     /**
-     * Get default payment method from the current user.
+     * Set the default payment method for the current user.
      *
-     * @throws RequestRequiresClientIdException
-     * @throws GuzzleException
+     * @throws Throwable
+     * @see \Anikeen\Id\Resources\PaymentMethods::setDefault()
      */
-    public function defaultPaymentMethod(): Result
+    public function setDefaultPaymentMethod(string $id): PaymentMethod
     {
-        return $this->request('GET', 'v1/payment-methods/default');
+        unset($this->paymentMethodsCache);
+
+        return $this->paymentMethods()->setDefault($id);
     }
 
     /**
      * Get billing portal URL for the current user.
      *
-     * @param string $returnUrl The URL to redirect to after the user has finished in the billing portal.
+     * @param string|null $returnUrl The URL to redirect to after the user has finished in the billing portal.
      * @param array $options Additional options for the billing portal.
-     * @throws RequestRequiresClientIdException
-     * @throws GuzzleException
+     * @throws Throwable
      */
-    public function billingPortalUrl(string $returnUrl, array $options): string
+    public function billingPortalUrl(?string $returnUrl = null, array $options = []): string
     {
-        return $this->request('POST', 'v1/stripe/billing-portal', [
-            'return_url' => $returnUrl,
-            'options' => $options,
-        ])->data->url;
+        return $this->anikeenId()
+            ->request('POST', 'v1/billing/portal', [
+                'return_url' => $returnUrl,
+                'options' => $options,
+            ])
+            ->data
+            ->url;
     }
 
     /**
      * Create a new setup intent.
      *
      * @param array $options Additional options for the setup intent.
-     * @throws RequestRequiresClientIdException
-     * @throws GuzzleException
+     * @throws Throwable
      */
     public function createSetupIntent(array $options = []): Result
     {
-        return $this->request('POST', 'v1/payment-methods', [
-            'options' => $options,
-        ]);
+        return $this->anikeenId()
+            ->request('POST', 'v1/payment-methods', [
+                'options' => $options,
+            ]);
     }
 }

src/Id/Concerns/ManagesPricing.php

@@ -3,9 +3,8 @@
 namespace Anikeen\Id\Concerns;
 
 use Anikeen\Id\ApiOperations\Post;
-use Anikeen\Id\Exceptions\RequestRequiresClientIdException;
 use Anikeen\Id\Result;
-use GuzzleHttp\Exception\GuzzleException;
+use Throwable;
 
 trait ManagesPricing
 {
@@ -29,11 +28,16 @@ trait ManagesPricing
      * } $attributes The order data:
      *   - country_iso:     ISO 3166-1 alpha-2 country code
      *   - items:           Array of order items (each with type, name, price, unit, units, and quantity)
-     * @throws RequestRequiresClientIdException
-     * @throws GuzzleException
+     * @throws Throwable
      */
     public function createOrderPreview(array $attributes = []): Result
     {
+        // the API expects the country as part of the billing address
+        if (isset($attributes['country_iso']) && !isset($attributes['billing_address'])) {
+            $attributes['billing_address'] = ['country_iso' => $attributes['country_iso']];
+            unset($attributes['country_iso']);
+        }
+
         return $this->post('v1/orders/preview', $attributes);
     }
 }

src/Id/Concerns/ManagesProducts.php

@@ -0,0 +1,29 @@
+<?php
+
+namespace Anikeen\Id\Concerns;
+
+use Anikeen\Id\Result;
+use Throwable;
+
+trait ManagesProducts
+{
+    /**
+     * Public product catalogue.
+     *
+     * @throws Throwable
+     */
+    public function products(): Result
+    {
+        return $this->request('GET', 'v1/products');
+    }
+
+    /**
+     * Shipping boxes (for shipping labels).
+     *
+     * @throws Throwable
+     */
+    public function boxes(): Result
+    {
+        return $this->request('GET', 'v1/boxes');
+    }
+}

src/Id/Concerns/ManagesProfile.php

@@ -0,0 +1,26 @@
+<?php
+
+namespace Anikeen\Id\Concerns;
+
+use Throwable;
+
+trait ManagesProfile
+{
+    use HasBillable;
+
+    /**
+     * Get the profile url for the current user.
+     *
+     * @param string|null $returnUrl The URL to redirect to after the user has completed their profile.
+     * @param array $options Additional options for the profile URL.
+     * @return string
+     * @throws Throwable
+     */
+    public function profilePortalUrl(?string $returnUrl = null, array $options = []): string
+    {
+        return $this->anikeenId()->request('POST', 'v1/user/profile', [
+            'return_url' => $returnUrl,
+            'options' => $options,
+        ])->data->url;
+    }
+}

src/Id/Concerns/ManagesShippingLabels.php

@@ -0,0 +1,85 @@
+<?php
+
+namespace Anikeen\Id\Concerns;
+
+use Anikeen\Id\Result;
+use Throwable;
+
+/**
+ * Shipping labels (Deutsche Post Internetmarke). Trusted apps only, sent with the app's token.
+ */
+trait ManagesShippingLabels
+{
+    /**
+     * Latest shipping labels (100 per page).
+     *
+     * @throws Throwable
+     */
+    public function shippingLabels(array $parameters = []): Result
+    {
+        return $this->asApp()->request('GET', 'v1/admin/shipping-labels', null, $parameters);
+    }
+
+    /**
+     * @throws Throwable
+     */
+    public function shippingLabel(string $id): Result
+    {
+        return $this->asApp()->request('GET', sprintf('v1/admin/shipping-labels/%s', $id));
+    }
+
+    /**
+     * The label as PDF (binary string), null if there is none.
+     *
+     * @throws Throwable
+     */
+    public function shippingLabelPdf(string $id): ?string
+    {
+        $result = $this->asApp()->request('GET', sprintf('v1/admin/shipping-labels/%s/pdf', $id));
+
+        return $result->success() ? (string) $result->response()->getBody() : null;
+    }
+
+    /**
+     * Buy a shipping label; the postage is billed to the given user.
+     *
+     * @param array{
+     *     box: array,
+     *     weight: int,
+     *     address: array,
+     *     billed_user_id: string,
+     *     test?: bool
+     * } $attributes
+     *   - box:            barcode, id, common_name or size of the box
+     *   - weight:         in grams
+     *   - address:        recipient address
+     *   - billed_user_id: Anikeen ID of the user who pays the postage
+     *   - test:           validate only, no real label is bought
+     * @throws Throwable
+     */
+    public function issueShippingLabel(array $attributes): Result
+    {
+        return $this->asApp()->request('POST', 'v1/admin/shipping-labels/issue', $attributes);
+    }
+
+    /**
+     * Mark the label with the scanned matrix code as shipped.
+     *
+     * @param list<string> $hex Hex bytes of the scanned Internetmarke matrix code
+     * @throws Throwable
+     */
+    public function shipShippingLabel(array $hex): Result
+    {
+        return $this->asApp()->request('POST', 'v1/admin/shipping-labels/ship', ['hex' => $hex]);
+    }
+
+    /**
+     * Prices of the available franking types.
+     *
+     * @throws Throwable
+     */
+    public function shippingPriceList(): Result
+    {
+        return $this->asApp()->request('GET', 'v1/admin/shipping-labels/price-list');
+    }
+}

src/Id/Concerns/ManagesSocialiteUsers.php

@@ -0,0 +1,23 @@
+<?php
+
+namespace Anikeen\Id\Concerns;
+
+use Anikeen\Id\ApiOperations\Get;
+use Anikeen\Id\Resources\SocialiteUsers;
+use Throwable;
+
+trait ManagesSocialiteUsers
+{
+    use Get;
+
+    /**
+     * Get all socialite connections for the authenticated user.
+     *
+     * @throws Throwable
+     */
+    public function socialiteUsers(): SocialiteUsers
+    {
+        return SocialiteUsers::builder(fn() => $this->get('v1/user/socialite-users'))
+            ->setParent($this);
+    }
+}

src/Id/Concerns/ManagesSshKeys.php

@@ -3,52 +3,25 @@
 
 namespace Anikeen\Id\Concerns;
 
-use Anikeen\Id\ApiOperations\Delete;
 use Anikeen\Id\ApiOperations\Get;
-use Anikeen\Id\ApiOperations\Post;
-use Anikeen\Id\Exceptions\RequestRequiresClientIdException;
-use Anikeen\Id\Result;
-use GuzzleHttp\Exception\GuzzleException;
+use Anikeen\Id\Resources\SshKeys;
+use Throwable;
 
 trait ManagesSshKeys
 {
-    use Get, Post, Delete;
+    use Get;
 
     /**
-     * Get currently authed user with Bearer Token.
+     * SSH keys of a user, read with the app's own token (trusted apps, scope ssh-keys:read),
+     * e.g. to install them on a new server.
      *
-     * @throws RequestRequiresClientIdException
-     * @throws GuzzleException
+     * @throws Throwable
      */
-    public function sshKeysByUserId(string $sskKeyId): Result
+    public function sshKeysByUserId(string $userId): SshKeys
     {
-        return $this->get(sprintf('v1/users/%s/ssh-keys/json', $sskKeyId));
-    }
+        $app = $this->asApp();
 
-    /**
-     * Creates ssh key for the currently authed user.
-     *
-     * @param string $publicKey The public key to be added
-     * @param string|null $name The name of the key (optional)
-     * @throws RequestRequiresClientIdException
-     * @throws GuzzleException
-     */
-    public function createSshKey(string $publicKey, string $name = null): Result
-    {
-        return $this->post('v1/ssh-keys', [
-            'public_key' => $publicKey,
-            'name' => $name,
-        ]);
-    }
-
-    /**
-     * Deletes a given ssh key for the currently authed user.
-     *
-     * @throws RequestRequiresClientIdException
-     * @throws GuzzleException
-     */
-    public function deleteSshKey(int $sshKeyId): Result
-    {
-        return $this->delete(sprintf('v1/ssh-keys/%s', $sshKeyId));
+        return SshKeys::builder(fn() => $app->get(sprintf('v1/client/users/%s/ssh-keys', $userId)))
+            ->setParent($app);
     }
 }

src/Id/Concerns/ManagesSubscriptions.php

@@ -2,102 +2,85 @@
 
 namespace Anikeen\Id\Concerns;
 
-use Anikeen\Id\ApiOperations\Request;
-use Anikeen\Id\Exceptions\RequestRequiresClientIdException;
-use Anikeen\Id\Result;
-use GuzzleHttp\Exception\GuzzleException;
+use Anikeen\Id\AnikeenId;
+use Anikeen\Id\Exceptions\ApiException;
+use Anikeen\Id\Resources\AppCheckoutSessions;
+use Anikeen\Id\Resources\AppOrders;
+use Anikeen\Id\Resources\AppSubscriptions;
+use Anikeen\Id\Resources\CheckoutSessions;
+use Anikeen\Id\Resources\Subscriptions;
+use Throwable;
 
 trait ManagesSubscriptions
 {
-    use Request;
+    use HasBillable;
 
     /**
      * Get subscriptions from the current user.
      *
-     * @throws RequestRequiresClientIdException
-     * @throws GuzzleException
+     * @throws Throwable
      */
-    public function subscriptions(): Result
+    public function subscriptions(): Subscriptions
     {
-        return $this->request('GET', 'v1/subscriptions');
+        if (!isset($this->subscriptionsCache)) {
+            $this->subscriptionsCache = Subscriptions::builder(fn() => $this->anikeenId()
+                ->request('GET', 'v1/subscriptions'))
+                ->setBillable($this);
+        }
+
+        return $this->subscriptionsCache;
     }
 
     /**
-     * Get given subscription from the current user.
-     *
-     * @param string $subscriptionId The subscription ID.
-     * @throws RequestRequiresClientIdException
-     * @throws GuzzleException
+     * The user's subscriptions, managed with the app's own token instead of the user's
+     * (trusted apps only, scope subscriptions:client). Use this in jobs and anywhere the user's
+     * login may have expired.
      */
-    public function subscription(string $subscriptionId): Result
+    public function appSubscriptions(): AppSubscriptions
     {
-        return $this->request('GET', sprintf('v1/subscriptions/%s', $subscriptionId));
+        return new AppSubscriptions($this);
     }
 
     /**
-     * Create a new subscription for the current user.
-     *
-     * @param array{
-     *      name: null,
-     *      description: string,
-     *      unit: string,
-     *      price: float,
-     *      vat: null|float,
-     *      payload: null|array,
-     *      ends_at: null|string,
-     *      webhook_url: null|string,
-     *      webhook_secret: null|string
-     *  } $attributes The subscription data:
-     *    - name:           The name
-     *    - description:    The description
-     *    - unit:           The unit (e.g. "hour", "day", "week", "month", "year")
-     *    - price:          The price per unit
-     *    - vat:            The VAT (optional)
-     *    - payload:        The payload (optional)
-     *    - ends_at:        The end date (optional)
-     *    - webhook_url:     The webhook URL (optional)
-     *    - webhook_secret:  The webhook secret (optional)
-     * @throws RequestRequiresClientIdException
-     * @throws GuzzleException
+     * Checkout sessions for the user, created with the app's own token (trusted apps only, scope
+     * subscriptions:client): the user confirms several subscriptions at once on Anikeen ID.
      */
-    public function createSubscription(array $attributes): Result
+    public function appCheckoutSessions(): AppCheckoutSessions
     {
-        return $this->request('POST', 'v1/subscriptions', $attributes);
+        return new AppCheckoutSessions($this);
     }
 
     /**
-     * Force given subscription to check out (trusted apps only).
-     *
-     * @param string $subscriptionId The subscription ID.
-     * @throws RequestRequiresClientIdException
-     * @throws GuzzleException
+     * Checkout sessions with the user's own access token (any app): the user confirms several
+     * subscriptions at once on Anikeen ID.
      */
-    public function checkoutSubscription(string $subscriptionId): Result
+    public function checkoutSessions(): CheckoutSessions
     {
-        return $this->request('PUT', sprintf('v1/subscriptions/%s/checkout', $subscriptionId));
+        return new CheckoutSessions($this);
     }
 
     /**
-     * Revoke a given running subscription from the current user.
-     *
-     * @param string $subscriptionId The subscription ID.
-     * @throws RequestRequiresClientIdException
-     * @throws GuzzleException
+     * The user's orders that bill the app's subscriptions, read with the app's own token
+     * (trusted apps only, scope orders:client), e.g. ->pending() for unpaid ones.
      */
-    public function revokeSubscription(string $subscriptionId): Result
+    public function appOrders(): AppOrders
     {
-        return $this->request('PUT', sprintf('v1/subscriptions/%s/revoke', $subscriptionId));
+        return new AppOrders($this);
     }
 
     /**
-     * Resume a given running subscription from the current user.
+     * A link to the user's billing pages on Anikeen ID that needs no login, created with the app's
+     * own token (trusted apps only, scope subscriptions:client or orders:client), e.g. for a
+     * "Manage billing" button; see AnikeenId::createBillingPortalLinkForUser() for the attributes
+     * (return_url, group, flow). Single use and valid for about 15 minutes: create it when the
+     * user clicks and redirect right away.
      *
-     * @param string $subscriptionId The subscription ID.
-     * @throws RequestRequiresClientIdException
-     * @throws GuzzleException
+     * @param array{return_url?: null|string, group?: null|string, flow?: null|string} $attributes
+     *
+     * @throws ApiException
      */
-    public function resumeSubscription(string $subscriptionId): Result
+    public function appBillingPortalUrl(array $attributes = []): string
     {
-        return $this->request('PUT', sprintf('v1/subscriptions/%s/resume', $subscriptionId));
+        return app(AnikeenId::class)->createBillingPortalLinkForUser($this->appSubscriptions()->userId(), $attributes)->url;
     }
 }

src/Id/Concerns/ManagesTaxation.php

@@ -2,22 +2,19 @@
 
 namespace Anikeen\Id\Concerns;
 
-use Anikeen\Id\ApiOperations\Request;
-use Anikeen\Id\Exceptions\RequestRequiresClientIdException;
-use GuzzleHttp\Exception\GuzzleException;
+use Throwable;
 
 trait ManagesTaxation
 {
-    use Request;
+    use HasBillable;
 
     /**
      * Get VAT for the current user.
      *
-     * @throws RequestRequiresClientIdException
-     * @throws GuzzleException
+     * @throws Throwable
      */
-    public function vat(): float
+    public function vatRate(): float
     {
-        return $this->getUserData()->vat;
+        return $this->getUserData()->vat_rate;
     }
 }

src/Id/Concerns/ManagesTransactions.php

@@ -2,48 +2,26 @@
 
 namespace Anikeen\Id\Concerns;
 
-use Anikeen\Id\ApiOperations\Request;
-use Anikeen\Id\Exceptions\RequestRequiresClientIdException;
-use Anikeen\Id\Result;
-use GuzzleHttp\Exception\GuzzleException;
+use Anikeen\Id\Resources\Transactions;
+use Throwable;
 
 trait ManagesTransactions
 {
-    use Request;
+    use HasBillable;
 
     /**
      * Get transactions from the current user.
      *
-     * @throws RequestRequiresClientIdException
-     * @throws GuzzleException
+     * @throws Throwable
      */
-    public function transactions(): Result
+    public function transactions(): Transactions
     {
-        return $this->request('GET', 'v1/transactions');
-    }
+        if (!isset($this->transactionsCache)) {
+            $this->transactionsCache = Transactions::builder(fn() => $this->anikeenId()
+                ->request('GET', 'v1/transactions'))
+                ->setBillable($this);
+        }
 
-    /**
-     * Create a new transaction for the current user.
-     *
-     * @param array $attributes The attributes for the transaction.
-     * @throws RequestRequiresClientIdException
-     * @throws GuzzleException
-     * @todo Add type hinting for the attributes array.
-     */
-    public function createTransaction(array $attributes = []): Result
-    {
-        return $this->request('POST', 'v1/transactions', $attributes);
-    }
-
-    /**
-     * Get given transaction from current current user.
-     *
-     * @param string $transactionId The transaction ID.
-     * @throws RequestRequiresClientIdException
-     * @throws GuzzleException
-     */
-    public function transaction(string $transactionId): Result
-    {
-        return $this->request('GET', sprintf('v1/transactions/%s', $transactionId));
+        return $this->transactionsCache;
     }
 }

src/Id/Concerns/ManagesUserBilling.php

@@ -0,0 +1,126 @@
+<?php
+
+namespace Anikeen\Id\Concerns;
+
+use Anikeen\Id\Exceptions\ApiException;
+use Anikeen\Id\Resources\AppCheckoutSessions;
+use Anikeen\Id\Resources\AppOrders;
+use Anikeen\Id\Result;
+use Anikeen\Id\Support\AppRequest;
+use Throwable;
+
+/**
+ * Orders and payments on behalf of a user. Trusted apps only, sent with the app's token.
+ */
+trait ManagesUserBilling
+{
+    /**
+     * Orders of all users that bill the app's subscriptions (e.g. ->pending() for unpaid ones).
+     */
+    public function appOrders(): AppOrders
+    {
+        return new AppOrders();
+    }
+
+    /**
+     * Checkout sessions of the app for any user, e.g. to look one up from a checkout.* webhook
+     * (create() then needs a user_id).
+     */
+    public function appCheckoutSessions(): AppCheckoutSessions
+    {
+        return new AppCheckoutSessions();
+    }
+
+    /**
+     * A link to a user's billing pages on Anikeen ID that needs no login, like Stripe's customer
+     * portal, e.g. for a "Manage billing" button of an app that bills another user's account (a
+     * team owner) without that user's token (trusted apps, scope subscriptions:client or
+     * orders:client). The link is single use and valid for about 15 minutes: create it when the
+     * user clicks and redirect right away, don't store it. It opens a portal session for that user
+     * only (no login, nobody signed in) with only the flow's billing pages and only what bills the
+     * app's subscriptions (of the group), leading back to return_url; it ends after an hour
+     * without activity.
+     *
+     * @param string $userId The user's Anikeen ID.
+     * @param array{
+     *     return_url?: null|string,
+     *     group?: null|string,
+     *     flow?: null|string
+     * } $attributes return_url: "Back to the app" (same origin as one of the app's redirect URIs,
+     *               422 otherwise).
+     *               group: only this group's subscriptions and the orders, invoices and
+     *               transactions billing them.
+     *               flow: overview (default), payment_method, payment_method_update (straight to
+     *               replacing the payment method, e.g. after a failed payment), invoices,
+     *               subscriptions or orders.
+     * @return object {object: "billing_portal_link", url, user_id, flow, group, return_url, expires_at}
+     *
+     * @throws ApiException 403 untrusted app or missing scope, 404 unknown user, 422 validation
+     */
+    public function createBillingPortalLinkForUser(string $userId, array $attributes = []): object
+    {
+        return AppRequest::send('POST', sprintf('v1/client/users/%s/billing-portal', $userId), $attributes)->data;
+    }
+
+    /**
+     * Create an order for a user (VAT from the billing address). With `checkout`, it is paid right
+     * away: with the given `transaction` (a payment captured elsewhere) or by charging the user's
+     * default payment method (402 when declined; the order stays pending and is retried).
+     *
+     * With `confirm`, the user confirms and pays it on Anikeen ID instead (e.g. a top-up): the
+     * order stays a draft with `confirmation_url` (send the user there) and is cancelled if not
+     * confirmed within 24 hours (`expires_at`; afterwards checking it out answers 409
+     * "confirmation_expired"). Webhooks: order.created, order.completed once paid, or
+     * order.cancelled when the user declines or it expires.
+     *
+     * @param string $userId The user's Anikeen ID.
+     * @param array{
+     *     group?: string,
+     *     billing_address_id?: string,
+     *     billing_address?: array,
+     *     shipping_address_id?: string,
+     *     shipping_address?: array,
+     *     items: array<array{type: string, name: string, description?: string, image_url?: string, price?: float|string, gross_price?: float|string, unit: string, units: int}>,
+     *     checkout?: bool,
+     *     confirm?: bool,
+     *     return_url?: null|string,
+     *     metadata?: null|array,
+     *     transaction_id?: string,
+     *     transaction?: array,
+     *     invoice_date?: string,
+     *     currency_iso?: string
+     * } $attributes confirm: needs items, can't be combined with checkout or a transaction.
+     *               return_url: where the user returns after confirming, with `status` and
+     *               `order` (same origin as one of the app's redirect URIs, 422 otherwise).
+     *               metadata: the app's own data (max. 50 keys), returned as is in the API and
+     *               the order webhooks.
+     * @throws Throwable
+     */
+    public function createOrderForUser(string $userId, array $attributes): Result
+    {
+        return $this->asApp()->request('POST', 'v1/admin/orders', [...$attributes, 'user_id' => $userId]);
+    }
+
+    /**
+     * Book a payment of a user that was captured elsewhere (e.g. PayPal, Ko-fi). The same
+     * provider/payment_intent can only be booked once (409 with the existing transaction_id).
+     *
+     * @param string $userId The user's Anikeen ID.
+     * @param array{
+     *     payment_provider?: string,
+     *     payment_intent?: string,
+     *     status: string,
+     *     type: string,
+     *     amount: float|string,
+     *     currency_iso: string,
+     *     created_at: string,
+     *     group?: string,
+     *     invoice_id?: string
+     * } $attributes
+     * @throws Throwable
+     */
+    public function createTransactionForUser(string $userId, array $attributes): Result
+    {
+        return $this->asApp()->request('POST', 'v1/admin/transactions', [...$attributes, 'user_id' => $userId]);
+    }
+}

src/Id/Concerns/ManagesUserSshKeys.php

@@ -0,0 +1,23 @@
+<?php
+
+namespace Anikeen\Id\Concerns;
+
+use Anikeen\Id\Resources\SshKeys;
+use Throwable;
+
+trait ManagesUserSshKeys
+{
+    use HasBillable;
+
+    /**
+     * SSH keys of the current user (user token).
+     *
+     * @throws Throwable
+     */
+    public function sshKeys(): SshKeys
+    {
+        $anikeenId = $this->anikeenId();
+
+        return SshKeys::builder(fn() => $anikeenId->get('v1/ssh-keys'))->setParent($anikeenId);
+    }
+}

src/Id/Concerns/ManagesUsers.php

@@ -5,19 +5,18 @@ namespace Anikeen\Id\Concerns;
 
 use Anikeen\Id\ApiOperations\Get;
 use Anikeen\Id\ApiOperations\Post;
-use Anikeen\Id\Exceptions\RequestRequiresClientIdException;
 use Anikeen\Id\Result;
-use GuzzleHttp\Exception\GuzzleException;
+use Throwable;
 
 trait ManagesUsers
 {
     use Get, Post;
+    use HasParent;
 
     /**
      * Get currently authed user with Bearer Token
      *
-     * @throws RequestRequiresClientIdException
-     * @throws GuzzleException
+     * @throws Throwable
      */
     public function getAuthedUser(): Result
     {
@@ -39,24 +38,66 @@ trait ManagesUsers
      *     - username:    The username (optional)
      *     - email:       The email (required)
      *     - password:    The password (optional, can be reset by the user if not provided)
-     * @throws RequestRequiresClientIdException
-     * @throws GuzzleException
+     * @throws Throwable
      */
     public function createUser(array $attributes): Result
     {
-        return $this->post('v1/users', $attributes);
+        // the API takes a single display name
+        if (!isset($attributes['name']) && (isset($attributes['first_name']) || isset($attributes['last_name']))) {
+            $attributes['name'] = trim(($attributes['first_name'] ?? '') . ' ' . ($attributes['last_name'] ?? '')) ?: null;
+        }
+
+        if (isset($attributes['password']) && !isset($attributes['password_confirmation'])) {
+            $attributes['password_confirmation'] = $attributes['password'];
+        }
+
+        unset($attributes['first_name'], $attributes['last_name']);
+
+        // finds the user by email or creates it (trusted apps, app token)
+        return $this->asApp()->post('v1/admin/users', $attributes);
+    }
+
+    /**
+     * Find the user of a social login or create it (trusted apps, app token).
+     *
+     * @param string $provider The socialite driver, e.g. "twitch".
+     * @param string $providerId The user's ID at the provider.
+     * @throws Throwable
+     */
+    public function findOrCreateSocialiteUser(string $provider, string $providerId, ?string $email = null, ?string $name = null): Result
+    {
+        return $this->asApp()->post('v1/admin/users/socialite', array_filter([
+            'provider' => $provider,
+            'provider_id' => $providerId,
+            'email' => $email,
+            'name' => $name,
+        ], fn ($value) => $value !== null));
+    }
+
+    /**
+     * Refreshes the access token using the refresh token.
+     */
+    public function refreshToken(string $storedRefreshToken, string $scope = ''): Result
+    {
+        return $this->post('../oauth/token', [
+            'grant_type' => 'refresh_token',
+            'refresh_token' => $storedRefreshToken,
+            'client_id' => $this->clientId,
+            'client_secret' => $this->clientSecret,
+            'scope' => $scope,
+        ]);
     }
 
     /**
      * Checks if the given email exists.
      *
      * @param string $email The email to check.
-     * @throws RequestRequiresClientIdException
-     * @throws GuzzleException
+     * @throws Throwable
      */
     public function isEmailExisting(string $email): Result
     {
-        return $this->post('v1/users/check', [
+        // `data.exists` tells whether an account uses the email (trusted apps, app token)
+        return $this->asApp()->post('v1/admin/users/check', [
             'email' => $email,
         ]);
     }

src/Id/Contracts/Billable.php

@@ -0,0 +1,12 @@
+<?php
+
+namespace Anikeen\Id\Contracts;
+
+use Anikeen\Id\AnikeenId;
+
+interface Billable
+{
+    public function getUserData(): object;
+
+    public function anikeenId(): AnikeenId;
+}

src/Id/Enums/CancellationReason.php

@@ -0,0 +1,13 @@
+<?php
+
+namespace Anikeen\Id\Enums;
+
+/**
+ * `cancellation_reason` of a subscription (and `data.reason` of `subscription.cancelled`): why
+ * Anikeen ID's billing ended it. Null when the user, the app or an admin cancelled it.
+ */
+class CancellationReason
+{
+    /** Its free trial (`trial_payment_method` optional) ended without a payment method: cancelled at the trial's end, nothing billed. */
+    const TRIAL_ENDED_WITHOUT_PAYMENT_METHOD = 'trial_ended_without_payment_method';
+}

src/Id/Enums/Scope.php

@@ -6,11 +6,35 @@ class Scope
 {
     const USER = 'user';
     const USER_READ = 'user:read';
-    const ORDERS = 'orders';
-    const ORDERS_READ = 'orders:read';
-    const PRODUCTS = 'products';
-    const PRODUCTS_READ = 'products:read';
+
+    const ADDRESSES = 'addresses';
+    const ADDRESSES_READ = 'addresses:read';
+
     const BILLING = 'billing';
     const BILLING_READ = 'billing:read';
+    const BILLING_CLIENT = 'billing:client';
+
+    const INVOICES = 'invoices';
+    const INVOICES_READ = 'invoices:read';
+    const INVOICES_CLIENT = 'invoices:client';
+
+    const ORDERS = 'orders';
+    const ORDERS_READ = 'orders:read';
+    const ORDERS_CLIENT = 'orders:client';
+
+    const PAYMENT_METHODS = 'payment-methods';
+    const PAYMENT_METHODS_READ = 'payment-methods:read';
+
+    const SUBSCRIPTIONS = 'subscriptions';
+    const SUBSCRIPTIONS_READ = 'subscriptions:read';
+    const SUBSCRIPTIONS_CLIENT = 'subscriptions:client';
+
+    const TRANSACTIONS = 'transactions';
+    const TRANSACTIONS_READ = 'transactions:read';
+    const TRANSACTIONS_CLIENT = 'transactions:client';
+
+    const SSH_KEYS = 'ssh-keys';
+    const SSH_KEYS_READ = 'ssh-keys:read';
+
     const ADMIN = 'admin';
 }

src/Id/Enums/SubscriptionStatus.php

@@ -0,0 +1,33 @@
+<?php
+
+namespace Anikeen\Id\Enums;
+
+/**
+ * The state of a subscription, see Subscription::status() and AppSubscription::status().
+ */
+class SubscriptionStatus
+{
+    /** Created, not checked out or confirmed by the user yet. */
+    const DRAFT = 'draft';
+
+    /** Running and billed, in its trial period. */
+    const TRIAL = 'trial';
+
+    /** Running and billed. */
+    const ACTIVE = 'active';
+
+    /** Paused: runs until its paid period ends, then expires. */
+    const PAUSED = 'paused';
+
+    /** Running until a scheduled cancellation takes effect. */
+    const CANCELLING = 'cancelling';
+
+    /** Paused and ran out: can be resumed (new period) or cancelled. */
+    const EXPIRED = 'expired';
+
+    /** Cancelled for good. */
+    const CANCELLED = 'cancelled';
+
+    /** None of the above. */
+    const INACTIVE = 'inactive';
+}

src/Id/Enums/TrialPaymentMethod.php

@@ -0,0 +1,20 @@
+<?php
+
+namespace Anikeen\Id\Enums;
+
+/**
+ * `trial_payment_method` of a subscription with a free trial: whether the user needs a payment
+ * method to confirm it. Null on subscriptions without a trial.
+ */
+class TrialPaymentMethod
+{
+    /** A payment method is needed to confirm the trial (the default). */
+    const REQUIRED = 'required';
+
+    /**
+     * The trial can be confirmed without a payment method (if nothing else has to be paid). If the
+     * user still has none when the trial ends, the subscription is cancelled then instead of billed
+     * (`cancellation_reason` CancellationReason::TRIAL_ENDED_WITHOUT_PAYMENT_METHOD).
+     */
+    const OPTIONAL = 'optional';
+}

src/Id/Exceptions/ApiException.php

@@ -0,0 +1,64 @@
+<?php
+
+namespace Anikeen\Id\Exceptions;
+
+use Anikeen\Id\Result;
+use Throwable;
+
+/**
+ * A request to the ID service failed. `status` is the HTTP status (0 when the service could not
+ * be reached), `error` the service's stable error code when it sent one (e.g. "already_cancelled").
+ */
+class ApiException extends ResourceException
+{
+    public function __construct(
+        string $message,
+        public readonly int $status = 0,
+        public readonly ?string $error = null,
+        ?Throwable $previous = null,
+    ) {
+        parent::__construct($message, $status, $previous);
+    }
+
+    /**
+     * The exception for a failed request: Anikeen ID's message and error code, the HTTP status
+     * (0 when there was no response).
+     */
+    public static function fromResult(Result $result): static
+    {
+        $body = is_object($result->data) ? $result->data : null;
+
+        return new static(
+            rtrim((string) ($body->message ?? $result->error()), '.'),
+            $result->response()?->getStatusCode() ?? 0,
+            $body->error ?? null,
+            $result->exception,
+        );
+    }
+
+    /**
+     * The exception for a request that got no response (network error, timeout).
+     */
+    public static function unreachable(Throwable $previous): static
+    {
+        return new static(sprintf('Anikeen ID is not reachable: %s', $previous->getMessage()), 0, null, $previous);
+    }
+
+    public function isNotFound(): bool
+    {
+        return $this->status === 404;
+    }
+
+    public function isConflict(): bool
+    {
+        return $this->status === 409;
+    }
+
+    /**
+     * The ID service could not be reached (network error, timeout) or failed (5xx): retry later.
+     */
+    public function isTemporary(): bool
+    {
+        return $this->status === 0 || $this->status >= 500 || $this->status === 429;
+    }
+}

src/Id/Exceptions/CollectionException.php

@@ -0,0 +1,11 @@
+<?php
+
+namespace Anikeen\Id\Exceptions;
+
+/**
+ * A list request failed. Like ApiException it carries the HTTP status (also as getCode()) and
+ * Anikeen ID's error code.
+ */
+class CollectionException extends ApiException
+{
+}

src/Id/Exceptions/ConfirmationRequiredException.php

@@ -0,0 +1,17 @@
+<?php
+
+namespace Anikeen\Id\Exceptions;
+
+use Throwable;
+
+/**
+ * Thrown when a third-party app tries to check out an order or subscription itself: the user has
+ * to confirm it on Anikeen ID. Send them to the confirmation URL instead.
+ */
+class ConfirmationRequiredException extends ResourceException
+{
+    public function __construct(string $message, int $code, public readonly ?string $confirmationUrl = null, ?Throwable $previous = null)
+    {
+        parent::__construct($message, $code, $previous);
+    }
+}

src/Id/Exceptions/ResourceException.php

@@ -0,0 +1,11 @@
+<?php
+
+namespace Anikeen\Id\Exceptions;
+
+use Anikeen\Id\Result;
+use Exception;
+
+class ResourceException extends Exception
+{
+    //
+}

src/Id/Exceptions/SignatureVerificationException.php

@@ -0,0 +1,13 @@
+<?php
+
+namespace Anikeen\Id\Exceptions;
+
+use Exception;
+
+/**
+ * The webhook request was not signed by Anikeen ID with your endpoint's secret, or is too old.
+ */
+class SignatureVerificationException extends Exception
+{
+    //
+}

src/Id/HasAnikeenTokens.php

@@ -26,9 +26,23 @@ trait HasAnikeenTokens
      */
     public function anikeenTokenCan(string $scope): bool
     {
-        $scopes = $this->accessToken ? $this->accessToken->scopes : [];
+        $scopes = (array) ($this->accessToken->scopes ?? []);
 
-        return in_array('*', $scopes) || in_array($scope, $this->accessToken->scopes);
+        return in_array('*', $scopes, true) || in_array($scope, $scopes, true);
+    }
+
+    /**
+     * Determine if the current API token has any of the given scopes.
+     */
+    public function anikeenTokenCanAny(array $scopes): bool
+    {
+        foreach ($scopes as $scope) {
+            if ($this->anikeenTokenCan($scope)) {
+                return true;
+            }
+        }
+
+        return false;
     }
 
     /**

src/Id/Helpers/JwtParser.php

@@ -2,34 +2,79 @@
 
 namespace Anikeen\Id\Helpers;
 
+use Anikeen\Id\AnikeenId;
 use Firebase\JWT\JWT;
 use Firebase\JWT\Key;
 use Illuminate\Auth\AuthenticationException;
 use Illuminate\Http\Request;
+use RuntimeException;
 use stdClass;
 use Throwable;
 
+/**
+ * Verifies access tokens issued by Anikeen ID (Passport, RS256): signature against
+ * Anikeen ID's public key plus the time claims (exp, nbf, iat; 60 seconds leeway).
+ *
+ * The key is `services.anikeen.public_key` (PEM, "\n" escapes allowed) or the file at
+ * `services.anikeen.public_key_path`, else the key shipped with this package for the
+ * configured mode (production / staging). It is read once per process.
+ */
 class JwtParser
 {
+    /**
+     * Public keys already read, by source.
+     *
+     * @var array<string, string>
+     */
+    private static array $keys = [];
+
     /**
      * @throws AuthenticationException
      */
     public function decode(Request $request): stdClass
     {
+        return $this->decodeToken((string) $request->bearerToken());
+    }
+
+    /**
+     * @throws AuthenticationException
+     */
+    public function decodeToken(string $token): stdClass
+    {
+        if ($token === '') {
+            throw new AuthenticationException('No access token given.');
+        }
+
         JWT::$leeway = 60;
 
+        // outside the try: a missing key is a configuration error, not an invalid token
+        $key = new Key($this->getOauthPublicKey(), 'RS256');
+
         try {
-            return JWT::decode(
-                $request->bearerToken(),
-                new Key($this->getOauthPublicKey(), 'RS256')
-            );
-        } catch (Throwable $exception) {
-            throw (new AuthenticationException());
+            return JWT::decode($token, $key);
+        } catch (Throwable) {
+            throw new AuthenticationException('The access token is invalid or expired.');
         }
     }
 
-    private function getOauthPublicKey(): bool|string
+    /**
+     * Forget the keys read so far (e.g. after changing the configuration in tests).
+     */
+    public static function flushKeys(): void
     {
-        return file_get_contents(dirname(__DIR__, 3) . '/oauth-public.key');
+        self::$keys = [];
+    }
+
+    protected function getOauthPublicKey(): string
+    {
+        if ($key = config('services.anikeen.public_key')) {
+            return self::$keys['config:' . md5($key)] ??= str_replace('\\n', "\n", $key);
+        }
+
+        $path = config('services.anikeen.public_key_path') ?: (AnikeenId::getMode() === 'staging'
+            ? dirname(__DIR__, 3) . '/oauth-public.staging.key'
+            : dirname(__DIR__, 3) . '/oauth-public.key');
+
+        return self::$keys['file:' . $path] ??= (is_readable($path) ? (string) file_get_contents($path) : throw new RuntimeException("Anikeen ID public key [$path] is not readable."));
     }
 }

src/Id/Http/Middleware/CheckCredentials.php

@@ -9,7 +9,7 @@ use Illuminate\Auth\AuthenticationException;
 use Illuminate\Http\Request;
 use stdClass;
 
-abstract class CheckCredentials
+abstract class CheckCredentials extends UseParameters
 {
     /**
      * Handle an incoming request.

src/Id/Http/Middleware/CheckForAnyScope.php

@@ -6,9 +6,9 @@ use Anikeen\Id\Exceptions\MissingScopeException;
 use Closure;
 use Illuminate\Auth\AuthenticationException;
 use Illuminate\Http\Request;
-use Illuminate\Http\Response;
+use Symfony\Component\HttpFoundation\Response;
 
-class CheckForAnyScope
+class CheckForAnyScope extends UseParameters
 {
     /**
      * Handle the incoming request.
@@ -17,7 +17,7 @@ class CheckForAnyScope
      */
     public function handle(Request $request, Closure $next, ...$scopes): Response
     {
-        if (!$request->user() || !$request->user()->anikeenToken()) {
+        if (!$request->user() || !method_exists($request->user(), 'anikeenToken') || !$request->user()->anikeenToken()) {
             throw new AuthenticationException;
         }
 

src/Id/Http/Middleware/CheckScopes.php

@@ -6,9 +6,9 @@ use Anikeen\Id\Exceptions\MissingScopeException;
 use Closure;
 use Illuminate\Auth\AuthenticationException;
 use Illuminate\Http\Request;
-use Illuminate\Http\Response;
+use Symfony\Component\HttpFoundation\Response;
 
-class CheckScopes
+class CheckScopes extends UseParameters
 {
     /**
      * Handle the incoming request.
@@ -17,7 +17,7 @@ class CheckScopes
      */
     public function handle(Request $request, Closure $next, ...$scopes): Response
     {
-        if (!$request->user() || !$request->user()->anikeenToken()) {
+        if (!$request->user() || !method_exists($request->user(), 'anikeenToken') || !$request->user()->anikeenToken()) {
             throw new AuthenticationException;
         }
 

src/Id/Http/Middleware/UseParameters.php

@@ -0,0 +1,20 @@
+<?php
+
+namespace Anikeen\Id\Http\Middleware;
+
+abstract class UseParameters
+{
+    /**
+     * Specify the parameters for the middleware.
+     *
+     * @param string[]|string $param
+     */
+    public static function using(array|string $param, string ...$params): string
+    {
+        if (is_array($param)) {
+            return static::class . ':' . implode(',', $param);
+        }
+
+        return static::class . ':' . implode(',', [$param, ...$params]);
+    }
+}

src/Id/OauthTrait.php

@@ -23,13 +23,11 @@ trait OauthTrait
                     ],
             ]);
 
-            $result = new Result($response, null);
+            $result = new Result($response, null, $this);
         } catch (RequestException $exception) {
-            $result = new Result($exception->getResponse(), $exception);
+            $result = new Result($exception->getResponse(), $exception, $this);
         }
 
-        $result->anikeenId = $this;
-
         return $result;
     }
 }

src/Id/Providers/AnikeenIdServiceProvider.php

@@ -8,8 +8,11 @@ use Anikeen\Id\Auth\UserProvider;
 use Anikeen\Id\Contracts;
 use Anikeen\Id\Helpers\JwtParser;
 use Anikeen\Id\Repository;
+use Illuminate\Auth\AuthManager;
 use Illuminate\Auth\RequestGuard;
-use Illuminate\Support\Facades\Auth;
+use Illuminate\Contracts\Foundation\Application;
+use Illuminate\Http\Request;
+use InvalidArgumentException;
 use Illuminate\Support\ServiceProvider;
 
 class AnikeenIdServiceProvider extends ServiceProvider
@@ -38,15 +41,28 @@ class AnikeenIdServiceProvider extends ServiceProvider
     }
 
     /**
-     * Register the token guard.
+     * Register the `anikeen` guard driver and user provider.
+     *
+     * Laravel binds non-static extend() closures to the AuthManager, so these closures are
+     * static and use nothing but their arguments.
      */
     protected function registerGuard(): void
     {
-        Auth::resolved(function ($auth) {
-            $auth->extend('anikeen-id', function ($app, $name, array $config) {
-                return tap($this->makeGuard($config), function ($guard) {
-                    $this->app->refresh('request', $guard, 'setRequest');
-                });
+        $this->callAfterResolving('auth', static function (AuthManager $auth): void {
+            $auth->provider('anikeen', static fn (Application $app, array $config) => new AnikeenIdUserProvider(
+                $app->make(AnikeenId::class),
+                $app->make('request'),
+                $config['model'] ?? $app['config']->get('auth.providers.users.model'),
+                $config['fields'] ?? [],
+                $config['column'] ?? null,
+            ));
+
+            $auth->extend('anikeen', static function (Application $app, string $name, array $config): RequestGuard {
+                $guard = AnikeenIdServiceProvider::makeGuard($app, $config);
+
+                $app->refresh('request', $guard, 'setRequest');
+
+                return $guard;
             });
         });
     }
@@ -54,15 +70,20 @@ class AnikeenIdServiceProvider extends ServiceProvider
     /**
      * Make an instance of the token guard.
      */
-    protected function makeGuard(array $config): RequestGuard
+    public static function makeGuard(Application $app, array $config): RequestGuard
     {
-        return new RequestGuard(function ($request) use ($config) {
+        $providerName = $config['provider'] ?? $app['config']->get('auth.defaults.provider', 'users');
+        $provider = $app['auth']->createUserProvider($providerName)
+            ?? throw new InvalidArgumentException("Authentication user provider [$providerName] is not configured.");
+        $providerConfig = $app['config']->get("auth.providers.$providerName", []);
+
+        return new RequestGuard(static function (Request $request) use ($app, $provider, $providerName, $providerConfig, $config) {
             return (new TokenGuard(
-                new UserProvider(Auth::createUserProvider($config['provider']), $config['provider']),
-                $this->app->make('encrypter'),
-                $this->app->make(JwtParser::class)
+                new UserProvider($provider, $providerName, $config['column'] ?? $providerConfig['column'] ?? null),
+                $app->make('encrypter'),
+                $app->make(JwtParser::class)
             ))->user($request);
-        }, $this->app['request']);
+        }, $app['request'], $provider);
     }
 
     /**

src/Id/Providers/AnikeenIdSsoUserProvider.php

@@ -1,113 +0,0 @@
-<?php
-
-
-namespace Anikeen\Id\Providers;
-
-use Anikeen\Id\AnikeenId;
-use Illuminate\Contracts\Auth\Authenticatable;
-use Illuminate\Contracts\Auth\UserProvider;
-use Illuminate\Database\Eloquent\Builder;
-use Illuminate\Database\Eloquent\Model;
-use Illuminate\Http\Request;
-use Illuminate\Support\Arr;
-
-class AnikeenIdSsoUserProvider implements UserProvider
-{
-    private ?string $accessTokenField = null;
-
-    public function __construct(
-        private AnikeenId $anikeenId,
-        private Request   $request,
-        private string    $model,
-        private array     $fields
-    )
-    {
-        $this->accessTokenField = AnikeenId::getAccessTokenField();
-    }
-
-    public function retrieveById(mixed $identifier): ?Authenticatable
-    {
-        $model = $this->createModel();
-        $token = $this->request->bearerToken();
-
-        $user = $this->newModelQuery($model)
-            ->where($model->getAuthIdentifierName(), $identifier)
-            ->first();
-
-        // Return user when found
-        if ($user) {
-            // Update access token when updated
-            if ($this->accessTokenField) {
-                $user[$this->accessTokenField] = $token;
-
-                if ($user->isDirty()) {
-                    $user->save();
-                }
-            }
-
-            return $user;
-        }
-
-        // Create new user
-        $this->anikeenId->setToken($token);
-        $result = $this->anikeenId->getAuthedUser();
-
-        if (!$result->success()) {
-            return null;
-        }
-
-        $attributes = Arr::only((array)$result->data(), $this->fields);
-        $attributes[$model->getAuthIdentifierName()] = $result->data->id;
-
-        if ($this->accessTokenField) {
-            $attributes[$this->accessTokenField] = $token;
-        }
-
-        return $this->newModelQuery($model)->create($attributes);
-    }
-
-    /**
-     * Create a new instance of the model.
-     */
-    public function createModel(): Model
-    {
-        $class = '\\' . ltrim($this->model, '\\');
-
-        return new $class;
-    }
-
-    /**
-     * Get a new query builder for the model instance.
-     */
-    protected function newModelQuery(?Model $model = null): Builder
-    {
-        return is_null($model)
-            ? $this->createModel()->newQuery()
-            : $model->newQuery();
-    }
-
-    public function retrieveByToken($identifier, $token)
-    {
-        return null;
-    }
-
-    public function updateRememberToken(Authenticatable $user, $token)
-    {
-        // void
-    }
-
-    public function retrieveByCredentials(array $credentials)
-    {
-        return null;
-    }
-
-    public function validateCredentials(Authenticatable $user, array $credentials): bool
-    {
-        return false;
-    }
-
-    public function rehashPasswordIfRequired(Authenticatable $user, #[\SensitiveParameter] array $credentials, bool $force = false)
-    {
-        // TODO: Implement rehashPasswordIfRequired() method.
-    }
-}

src/Id/Providers/AnikeenIdUserProvider.php

@@ -0,0 +1,136 @@
+<?php
+
+namespace Anikeen\Id\Providers;
+
+use Anikeen\Id\AnikeenId;
+use Illuminate\Contracts\Auth\Authenticatable;
+use Illuminate\Contracts\Auth\UserProvider;
+use Illuminate\Database\Eloquent\Builder;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Http\Request;
+use Illuminate\Support\Arr;
+
+class AnikeenIdUserProvider implements UserProvider
+{
+    private ?string $accessTokenField;
+
+    public function __construct(
+        private AnikeenId $anikeenId,
+        private Request   $request,
+        private string    $model,
+        private array     $fields = [],
+        private ?string   $column = null,
+    ) {
+        $this->accessTokenField = AnikeenId::getAccessTokenField();
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function retrieveByToken($identifier, $token): ?Authenticatable
+    {
+        // Token from request (if not already pass from $token):
+        $token = $token ?: $this->request->bearerToken();
+        if (! $token) {
+            return null;
+        }
+
+        // Set token in SSO client and request user info
+        $this->anikeenId->setToken($token);
+        $result = $this->anikeenId->getAuthedUser();
+        if (! $result->success()) {
+            return null;
+        }
+
+        // Only the desired fields
+        $data = Arr::only((array)$result->data(), $this->fields);
+        // Primary key (e.g. $user->id)
+        $pk = $this->createModel()->getAuthIdentifierName();
+        $data[$pk] = $result->data->id;
+
+        // Fill in access token field, if available
+        if ($this->accessTokenField) {
+            $data[$this->accessTokenField] = $token;
+        }
+
+        // Local eloquent model: either find or create a new one
+        /** @var Model $modelInstance */
+        $modelInstance = $this->newModelQuery()
+            ->firstOrNew([$pk => $data[$pk]]);
+
+        $modelInstance->fill($data);
+        $modelInstance->save();
+
+        return $modelInstance;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function updateRememberToken(Authenticatable $user, $token): void
+    {
+        // no-op
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function retrieveByCredentials(array $credentials): ?Authenticatable
+    {
+        return null;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function validateCredentials(Authenticatable $user, array $credentials): bool
+    {
+        return true;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function retrieveById($identifier): ?Authenticatable
+    {
+        return $this->newModelQuery()
+            ->where($this->createModel()->getAuthIdentifierName(), $identifier)
+            ->first();
+    }
+
+    /**
+     * Find the user of an Anikeen ID (the `sub` of an access token) by the provider's `column`,
+     * else `services.anikeen.user_id_column`, else AnikeenId::getUserIdField() (`anikeen_id`).
+     */
+    public function retrieveByAnikeenId(string $anikeenId): ?Authenticatable
+    {
+        $column = $this->column ?: (config('services.anikeen.user_id_column') ?: AnikeenId::getUserIdField());
+
+        return $this->newModelQuery()->where($column, $anikeenId)->first();
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function rehashPasswordIfRequired(Authenticatable $user, #[\SensitiveParameter] array $credentials, bool $force = false): void
+    {
+        // no-op
+    }
+
+    /**
+     * @return Model
+     */
+    protected function createModel(): Model
+    {
+        $class = '\\' . ltrim($this->model, '\\');
+        return new $class;
+    }
+
+    /**
+     * @return Builder
+     */
+    protected function newModelQuery(): Builder
+    {
+        return $this->createModel()->newQuery();
+    }
+}

src/Id/Repository/AppTokenRepository.php

@@ -32,6 +32,14 @@ class AppTokenRepository implements Repository
         return $this->requestFreshAccessToken('*');
     }
 
+    /**
+     * Drop the cached token, e.g. after the ID service rejected it.
+     */
+    public function forgetAccessToken(): void
+    {
+        Cache::forget(self::ACCESS_TOKEN_CACHE_KEY);
+    }
+
     /**
      * @throws RequestFreshAccessTokenException
      */

src/Id/Resources/Address.php

@@ -0,0 +1,83 @@
+<?php
+
+namespace Anikeen\Id\Resources;
+
+use Anikeen\Id\Concerns\HasBillable;
+use Throwable;
+
+/**
+ * @property string $id
+ * @property null|string $company_name
+ * @property null|string $first_name
+ * @property null|string $last_name
+ * @property null|string $address_2
+ * @property null|string $address
+ * @property null|string $house_number
+ * @property null|string $postal_code
+ * @property null|string $city
+ * @property null|string $state
+ * @property string $country_iso
+ * @property null|string $phone_number
+ * @property null|string $email
+ * @property bool $primary
+ * @property bool $primary_billing_address
+ */
+class Address extends BaseResource
+{
+    use HasBillable;
+
+    /**
+     * Update given address from the current user.
+     *
+     * VAT is calculated based on the billing address and shown in the address response.
+     *
+     * @param array{
+     *      company_name: null|string,
+     *      first_name:  string,
+     *      last_name: string,
+     *      address_2: null|string,
+     *      address: string,
+     *      house_number: null|string,
+     *      postal_code: string,
+     *      city: string,
+     *      state: null|string,
+     *      country_iso: string,
+     *      phone_number: null|string,
+     *      email: null|string,
+     *      primary: bool,
+     *      primary_billing_address: bool
+     *  } $attributes The address data:
+     *    - company_name:            Company name (optional)
+     *    - first_name:              First name (required when set)
+     *    - last_name:               Last name (required when set)
+     *    - address:                 Address line 1 (e.g. street address, P.O. Box, etc.)
+     *    - address_2:               Address line 2 (optional, e.g. apartment number, c/o, etc.)
+     *    - house_number:            House number (optional)
+     *    - postal_code:             Postal code (required when set)
+     *    - city:                    City (required when set)
+     *    - state:                   State (optional, e.g. province, region, etc.)
+     *    - country_iso:             Country ISO code (required when set, e.g. US, CA, etc.)
+     *    - phone_number:            Phone number (optional)
+     *    - email:                   Email address (optional, e.g. for delivery notifications)
+     *    - primary:                 Whether this address should be the primary address (optional)
+     *    - primary_billing_address: Whether this address should be the primary billing address (optional)
+     * @throws Throwable
+     */
+    public function update(array $attributes = []): self
+    {
+        return (new self(fn() => $this->billable->anikeenId()
+            ->request('PUT', sprintf('v1/addresses/%s', $this->id), $attributes)))
+            ->setBillable($this->billable);
+    }
+
+    /**
+     * Delete given address from the current user.
+     *
+     * @throws Throwable
+     */
+    public function delete(): bool
+    {
+        return $this->billable->anikeenId()
+            ->request('DELETE', sprintf('v1/addresses/%s', $this->id))->success();
+    }
+}

src/Id/Resources/Addresses.php

@@ -0,0 +1,85 @@
+<?php
+
+namespace Anikeen\Id\Resources;
+
+use Anikeen\Id\Concerns\HasBillable;
+use Throwable;
+
+class Addresses extends BaseCollection
+{
+    use HasBillable;
+
+    /**
+     * Creates a new address for the current user.
+     *
+     * @param array{
+     *       company_name: null|string,
+     *       first_name:  string,
+     *       last_name: string,
+     *       address: string,
+     *       address_2: null|string,
+     *       house_number: null|string,
+     *       postal_code: string,
+     *       city: string,
+     *       state: null|string,
+     *       country_iso: string,
+     *       phone_number: null|string,
+     *       email: null|string,
+     *       primary: bool,
+     *       primary_billing_address: bool
+     *   } $attributes The address data:
+     * 　  - company_name:            Company name (optional)
+     * 　  - first_name:              First name
+     * 　  - last_name:               Last name
+     * 　  - address:                 Address line 1 (e.g. street address, P.O. Box, etc.)
+     * 　  - address_2:               Address line 2 (optional, e.g. apartment number, c/o, etc.)
+     * 　  - house_number:            House number (optional)
+     * 　  - postal_code:             Postal code
+     * 　  - city:                    City
+     * 　  - state:                   State (optional, e.g. province, region, etc.)
+     * 　  - country_iso:             Country ISO code (e.g. US, CA, etc.)
+     * 　  - phone_number:            Phone number (optional)
+     * 　  - email:                   Email address (optional, e.g. for delivery notifications)
+     * 　  - primary:                 Whether this address should be the primary address (optional)
+     * 　  - primary_billing_address: Whether this address should be the primary billing address (optional)
+     * @throws Throwable
+     */
+    public function create(array $attributes = []): Address
+    {
+        return (new Address(fn() => $this->billable->anikeenId()
+            ->request('POST', 'v1/addresses', $attributes)))
+            ->setBillable($this->billable);
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function find(string $id): ?Address
+    {
+        return (new Address(fn() => $this->billable->anikeenId()
+            ->request('GET', sprintf('v1/addresses/%s', $id))))
+            ->setBillable($this->billable);
+    }
+
+    /**
+     * Get default address from the current user.
+     *
+     * @throws Throwable
+     */
+    public function defaultBillingAddress(): Address
+    {
+        return (new Address(fn() => $this->billable->anikeenId()
+            ->request('GET', sprintf('v1/addresses/%s', $this->billable->getUserData()->billing_address_id))))
+            ->setBillable($this->billable);
+    }
+
+    /**
+     * Check if the current user has a default billing address.
+     *
+     * @throws Throwable
+     */
+    public function hasDefaultBillingAddress(): bool
+    {
+        return $this->billable->getUserData()->billing_address_id !== null;
+    }
+}

src/Id/Resources/AppCheckoutSession.php

@@ -0,0 +1,97 @@
+<?php
+
+namespace Anikeen\Id\Resources;
+
+use Anikeen\Id\Concerns\IsCheckoutSession;
+use Anikeen\Id\Exceptions\ApiException;
+use Anikeen\Id\Support\AppRequest;
+use JsonSerializable;
+
+/**
+ * A checkout session created with the app's own token, see AppCheckoutSessions.
+ *
+ * @property string $id
+ * @property string $user_id
+ * @property ?string $oauth_client_id
+ * @property string $status open, completed, cancelled or expired
+ * @property ?string $return_url
+ * @property ?object $metadata
+ * @property ?string $confirmation_url
+ * @property list<string> $subscription_ids
+ * @property list<object> $subscriptions
+ * @property ?string $expires_at
+ * @property ?string $completed_at
+ * @property ?string $cancelled_at
+ * @property ?string $created_at
+ */
+class AppCheckoutSession implements JsonSerializable
+{
+    use IsCheckoutSession;
+
+    public const STATUS_OPEN = 'open';
+    public const STATUS_COMPLETED = 'completed';
+    public const STATUS_CANCELLED = 'cancelled';
+    public const STATUS_EXPIRED = 'expired';
+
+    public function __construct(protected object $data)
+    {
+    }
+
+    public function __get(string $name): mixed
+    {
+        return $this->data->{$name} ?? null;
+    }
+
+    public function __isset(string $name): bool
+    {
+        return isset($this->data->{$name});
+    }
+
+    /**
+     * The session's subscriptions (drafts until the user confirms).
+     *
+     * @return list<AppSubscription>
+     */
+    public function subscriptions(): array
+    {
+        return array_map(fn (object $subscription) => new AppSubscription($subscription), array_values((array) ($this->data->subscriptions ?? [])));
+    }
+
+    /**
+     * Withdraw an open session (e.g. the cart changed): it and its drafts are cancelled.
+     *
+     * @throws ApiException 409 "checkout_session_completed", "checkout_session_cancelled", "checkout_session_expired"
+     */
+    public function cancel(): self
+    {
+        return $this->send('POST', '/cancel');
+    }
+
+    /**
+     * @throws ApiException
+     */
+    public function refresh(): self
+    {
+        return $this->send('GET', '');
+    }
+
+    public function toArray(): array
+    {
+        return (array) $this->data;
+    }
+
+    public function jsonSerialize(): array
+    {
+        return $this->toArray();
+    }
+
+    /**
+     * @throws ApiException
+     */
+    private function send(string $method, string $action): self
+    {
+        $this->data = AppRequest::send($method, sprintf('v1/client/checkout-sessions/%s%s', $this->id, $action))->data;
+
+        return $this;
+    }
+}

src/Id/Resources/AppCheckoutSessions.php

@@ -0,0 +1,91 @@
+<?php
+
+namespace Anikeen\Id\Resources;
+
+use Anikeen\Id\Contracts\Billable;
+use Anikeen\Id\Exceptions\ApiException;
+use Anikeen\Id\Support\AppRequest;
+use Illuminate\Database\Eloquent\Model;
+use InvalidArgumentException;
+
+/**
+ * Checkout sessions created with the app's own token (trusted apps, scope `subscriptions:client`):
+ * several subscriptions of one user that the user confirms together on Anikeen ID, instead of the
+ * app checking them out itself. For one user ($user->appCheckoutSessions()) or, to look sessions
+ * up e.g. from a webhook, for all users (app(AnikeenId::class)->appCheckoutSessions()).
+ * Nothing is requested until a method is called.
+ */
+class AppCheckoutSessions
+{
+    public function __construct(protected Billable|Model|null $billable = null)
+    {
+    }
+
+    /**
+     * Open a checkout session with new subscriptions (their attributes, like
+     * AppSubscriptions::create()) and/or existing drafts of the app (`['id' => …]`).
+     *
+     * @param array{
+     *     subscriptions: list<array{id: string}|array{
+     *         group?: null|string,
+     *         name: string,
+     *         description?: null|string,
+     *         unit: string,
+     *         price: float|string,
+     *         monthly_cap?: null|float|string,
+     *         predecessor_id?: null|string,
+     *         vat_rate?: float,
+     *         payload?: null|array,
+     *         ends_at?: null|string,
+     *         trial_days?: null|int,
+     *         trial_ends_at?: null|string,
+     *         trial_once?: bool,
+     *         trial_payment_method?: null|string,
+     *         discount?: null|array{label: string, percent_off?: float|string, amount_off?: float|string, duration: string, duration_in_periods?: int}
+     *     }>,
+     *     return_url?: null|string,
+     *     metadata?: null|array,
+     *     idempotency_key?: null|string,
+     *     user_id?: string
+     * } $attributes return_url must share scheme, host and port with one of the app's redirect
+     *               URIs; the user comes back to it with `status` and `checkout_session`. A
+     *               repeated idempotency_key returns the first session instead of a new one.
+     *               trial_days / trial_ends_at give a subscription a free trial from the user's
+     *               confirmation on; trial_once is allowed on one subscription per group.
+     *               trial_payment_method `optional`: the session can be confirmed without a
+     *               payment method only if all of its subscriptions are such trials.
+     *               discount: see AppSubscriptions::create(); the confirmation page shows it.
+     *
+     * @throws ApiException 422 validation (e.g. return_url), 409 "idempotency_key_conflict"
+     */
+    public function create(array $attributes): AppCheckoutSession
+    {
+        if ($this->billable) {
+            $attributes['user_id'] = (new AppSubscriptions($this->billable))->userId();
+        } elseif (empty($attributes['user_id'])) {
+            throw new InvalidArgumentException('A checkout session needs a user: use $user->appCheckoutSessions() or pass user_id.');
+        }
+
+        return new AppCheckoutSession(AppRequest::send('POST', 'v1/client/checkout-sessions', $attributes)->data);
+    }
+
+    /**
+     * A session of the app; null when it doesn't exist (or belongs to another user).
+     *
+     * @throws ApiException
+     */
+    public function find(string $id): ?AppCheckoutSession
+    {
+        try {
+            $session = new AppCheckoutSession(AppRequest::send('GET', sprintf('v1/client/checkout-sessions/%s', $id))->data);
+        } catch (ApiException $e) {
+            if ($e->isNotFound()) {
+                return null;
+            }
+
+            throw $e;
+        }
+
+        return !$this->billable || $session->user_id === (new AppSubscriptions($this->billable))->userId() ? $session : null;
+    }
+}

src/Id/Resources/AppOrders.php

@@ -0,0 +1,117 @@
+<?php
+
+namespace Anikeen\Id\Resources;
+
+use Anikeen\Id\AnikeenId;
+use Anikeen\Id\Contracts\Billable;
+use Anikeen\Id\Exceptions\ApiException;
+use Anikeen\Id\Support\AppRequest;
+use Illuminate\Database\Eloquent\Model;
+
+/**
+ * Orders that bill the app's subscriptions, read with the app's own token (trusted apps,
+ * scope orders:client) - of one user ($user->appOrders()) or of all users
+ * (app(AnikeenId::class)->appOrders()). Nothing is requested until a method is called.
+ *
+ * Each order is an object with id, user_id, oauth_client_id (the app that bills it: collective
+ * orders are kept per app, even for the same group; null on legacy orders that billed several
+ * apps), group, metadata, status (processing|pending|completed|cancelled), is_collective,
+ * net_total, vat_total, gross_total, currency_iso, created_at, paid_at, payment_attempts,
+ * next_payment_attempt_at, last_payment_error ({code, message} or null), and
+ *
+ * - items: the order's lines of the app's subscriptions (all lines, except on legacy orders that
+ *   also billed other apps), each {id, name, description, type, image_url, units, unit,
+ *   price, vat_rate, subscription_id, meter, monthly_cap, discount, period_start, period_end,
+ *   net_amount, vat_amount, gross_amount}. period_end is exclusive (the start of the next
+ *   period); both are null for lines without a period. discount ({label, percent_off,
+ *   amount_off}) marks the negative line of a subscription's discount, else null. The net amount
+ *   a subscription was billed is the sum of net_amount of its lines.
+ * - invoice: null until the order is paid, then {id, number, type, status (pending while the PDF
+ *   is being rendered, then completed), service_period_from, service_period_to, created_at,
+ *   pdf_url}; see invoicePdf().
+ */
+class AppOrders
+{
+    public function __construct(protected Billable|Model|null $billable = null)
+    {
+    }
+
+    /**
+     * All matching orders, oldest first.
+     *
+     * @param array{status?: string, group?: string} $filters
+     * @return list<object>
+     *
+     * @throws ApiException
+     */
+    public function all(array $filters = []): array
+    {
+        $orders = [];
+        $page = 1;
+
+        do {
+            $result = AppRequest::send('GET', 'v1/client/orders', null, [
+                ...$filters,
+                ...($this->billable ? ['user_id' => $this->userId()] : []),
+                'per_page' => 100,
+                'page' => $page,
+            ]);
+
+            array_push($orders, ...$result->data);
+            $lastPage = (int) ($result->meta->last_page ?? $page);
+        } while ($page++ < $lastPage);
+
+        return $orders;
+    }
+
+    /**
+     * Closed orders that aren't paid (yet), oldest first.
+     *
+     * @return list<object>
+     *
+     * @throws ApiException
+     */
+    public function pending(array $filters = []): array
+    {
+        return $this->all([...$filters, 'status' => 'pending']);
+    }
+
+    /**
+     * @throws ApiException
+     */
+    public function find(string $id): ?object
+    {
+        try {
+            $order = AppRequest::send('GET', sprintf('v1/client/orders/%s', $id))->data;
+        } catch (ApiException $e) {
+            if ($e->isNotFound()) {
+                return null;
+            }
+
+            throw $e;
+        }
+
+        return !$this->billable || $order->user_id === $this->userId() ? $order : null;
+    }
+
+    /**
+     * The PDF of an order's invoice (binary string, with the embedded e-invoice), the same as its
+     * `invoice.pdf_url` with the app's token.
+     *
+     * @throws ApiException 404 "order_not_found", 404 "invoice_not_found" (not paid yet),
+     *                      409 "invoice_not_ready" (still being rendered, try again later)
+     */
+    public function invoicePdf(string $orderId): string
+    {
+        if ($this->billable && !$this->find($orderId)) {
+            throw new ApiException('Order not found.', 404, 'order_not_found');
+        }
+
+        return (string) AppRequest::send('GET', sprintf('v1/client/orders/%s/invoice', $orderId))->response()?->getBody();
+    }
+
+    private function userId(): string
+    {
+        return (new AppSubscriptions($this->billable))->userId();
+    }
+}

src/Id/Resources/AppSubscription.php

@@ -0,0 +1,201 @@
+<?php
+
+namespace Anikeen\Id\Resources;
+
+use Anikeen\Id\Concerns\HasSubscriptionStatus;
+use Anikeen\Id\Exceptions\ApiException;
+use Anikeen\Id\Support\AppRequest;
+use DateTimeInterface;
+use JsonSerializable;
+
+/**
+ * A subscription managed by the app itself (client credentials), see AppSubscriptions.
+ *
+ * @property string $id
+ * @property string $user_id
+ * @property ?string $group
+ * @property string $name
+ * @property ?string $description
+ * @property string $unit
+ * @property float $price
+ * @property ?float $monthly_cap net, at most this per calendar month (hour and day units)
+ * @property ?float $expected_monthly_price gross estimate for a month (720 hours, at most the monthly cap)
+ * @property ?string $predecessor_id the subscription this one replaced (a resize); they share the monthly cap
+ * @property ?float $vat_rate
+ * @property bool $active
+ * @property bool $autorenew
+ * @property bool $cancelled
+ * @property ?string $status draft, trial, active, paused, cancelling, expired or cancelled, see status()
+ * @property ?string $cancels_at when a scheduled cancellation takes effect
+ * @property ?string $trial_ends_at
+ * @property ?string $trial_payment_method required or optional with a trial (TrialPaymentMethod), null without
+ * @property ?string $cancellation_reason why the billing cancelled it (CancellationReason), null otherwise
+ * @property ?object $discount {label, percent_off, amount_off, duration, duration_in_periods, periods_remaining}; periods_remaining is null for `forever`, 0 once it ended
+ * @property ?string $starts_at
+ * @property ?string $ends_at
+ * @property ?string $accounting_at
+ * @property bool $is_past_due
+ * @property int $failed_renewal_retries
+ * @property ?array $payload
+ * @property ?string $idempotency_key
+ * @property ?string $checkout_session_id the checkout session the user confirms it in, if any
+ * @property ?object $scheduled_change {applies_at, name, description, unit, price, discount, created_at}: a change() for the period end
+ */
+class AppSubscription implements JsonSerializable
+{
+    use HasSubscriptionStatus;
+
+    /** change(): prorated, right away. */
+    public const APPLY_NOW = 'now';
+
+    /** change(): from the next period on (scheduled_change until then). */
+    public const APPLY_PERIOD_END = 'period_end';
+
+    public function __construct(protected object $data)
+    {
+    }
+
+    public function __get(string $name): mixed
+    {
+        return $this->data->{$name} ?? null;
+    }
+
+    public function __isset(string $name): bool
+    {
+        return isset($this->data->{$name});
+    }
+
+    /**
+     * Change a subscription (send only what changes). Before checkout everything can change;
+     * afterwards only the description, which names what the customer pays for and is shown
+     * on their bills, e.g. `$subscription->update(['description' => 'web-01.example.com'])`.
+     * Prices of running subscriptions change with change().
+     *
+     * @throws ApiException
+     */
+    public function update(array $attributes): self
+    {
+        return $this->send('PUT', '', $attributes);
+    }
+
+    /**
+     * Change a running subscription (send only what changes), like a plan change:
+     *
+     * - `apply: now`: prorated – the unused rest of the current period is credited at the rate it
+     *   was billed at and charged at the new price on the user's open bill. A new unit starts a
+     *   new, fully billed period now. A downgrade whose credit exceeds the open bill is refused
+     *   (409 "credit_exceeds_bill"): schedule it for the period end instead.
+     * - `apply: period_end`: nothing changes now; the subscription has `scheduled_change` and the
+     *   next period is billed at the new values. A new scheduled change replaces the previous one.
+     *
+     * During a free trial nothing was billed, so both just change what the trial ends in.
+     * Webhook `subscription.updated` (with `data.previous_attributes`) when the change takes effect.
+     *
+     * @param array{
+     *     apply: string,
+     *     price?: float|string,
+     *     unit?: string,
+     *     name?: string,
+     *     description?: null|string,
+     *     discount?: null|array{label: string, percent_off?: float|string, amount_off?: float|string, duration: string, duration_in_periods?: int}
+     * } $attributes apply: self::APPLY_NOW or self::APPLY_PERIOD_END.
+     *               unit: a recurring unit (hour, day, week, month, year).
+     *               discount: replaces the discount from the next billed period on, null ends it;
+     *               required with a new unit when the current one counts in periods or is an
+     *               amount_off. Subscriptions with a monthly cap change only at the period end.
+     *
+     * @throws ApiException 409 "not_changeable" (not running: draft, paused, cancelling, …),
+     *                      "proration_not_possible", "credit_exceeds_bill",
+     *                      "billing_address_missing"; 422 validation
+     */
+    public function change(array $attributes): self
+    {
+        return $this->send('PUT', '/change', $attributes);
+    }
+
+    /**
+     * Drop the change scheduled for the period end (nothing happens without one).
+     *
+     * @throws ApiException
+     */
+    public function cancelScheduledChange(): self
+    {
+        return $this->send('DELETE', '/change');
+    }
+
+    /**
+     * Activate the subscription and bill its first period.
+     *
+     * $startsAt (in the past) books a service that is already running, e.g. a domain registered
+     * earlier: the first period runs from $startsAt, is billed now and renews when it ends.
+     *
+     * @throws ApiException 409 "already_active", "billing_address_missing", "period_already_ended", …
+     */
+    public function checkout(DateTimeInterface|string|null $startsAt = null): self
+    {
+        if ($startsAt instanceof DateTimeInterface) {
+            $startsAt = $startsAt->format(DateTimeInterface::ATOM);
+        }
+
+        return $this->send('PUT', '/checkout', $startsAt === null ? null : ['starts_at' => $startsAt]);
+    }
+
+    /**
+     * Cancel the subscription. With $refund (only within 14 days of its start), its not yet
+     * charged usage is credited.
+     *
+     * @throws ApiException 409 "already_cancelled", 404 "subscription_not_found", …
+     */
+    public function revoke(bool $refund = false): self
+    {
+        return $this->send('PUT', '/revoke', ['refund' => $refund]);
+    }
+
+    /**
+     * Stop renewing; the subscription expires when its paid period ends.
+     *
+     * @throws ApiException
+     */
+    public function pause(): self
+    {
+        return $this->send('PUT', '/pause');
+    }
+
+    /**
+     * Renew again (an expired subscription starts a new period).
+     *
+     * @throws ApiException
+     */
+    public function resume(): self
+    {
+        return $this->send('PUT', '/resume');
+    }
+
+    /**
+     * @throws ApiException
+     */
+    public function refresh(): self
+    {
+        return $this->send('GET', '');
+    }
+
+    public function toArray(): array
+    {
+        return (array) $this->data;
+    }
+
+    public function jsonSerialize(): array
+    {
+        return $this->toArray();
+    }
+
+    /**
+     * @throws ApiException
+     */
+    private function send(string $method, string $action, ?array $payload = null): self
+    {
+        $this->data = AppRequest::send($method, sprintf('v1/client/subscriptions/%s%s', $this->id, $action), $payload)->data;
+
+        return $this;
+    }
+}

src/Id/Resources/AppSubscriptions.php

@@ -0,0 +1,138 @@
+<?php
+
+namespace Anikeen\Id\Resources;
+
+use Anikeen\Id\AnikeenId;
+use Anikeen\Id\Contracts\Billable;
+use Anikeen\Id\Exceptions\ApiException;
+use Anikeen\Id\Support\AppRequest;
+use Illuminate\Database\Eloquent\Model;
+use InvalidArgumentException;
+
+/**
+ * Subscriptions of a user, managed with the app's own token (client credentials, scope
+ * `subscriptions:client`) instead of the user's token, so they keep working when the user's
+ * login expired. The app has to be trusted by the ID service. Nothing is requested until a
+ * method is called.
+ */
+class AppSubscriptions
+{
+    public function __construct(protected Billable|Model $billable)
+    {
+    }
+
+    /**
+     * The user's Anikeen ID (see AnikeenId::useUserIdField()).
+     */
+    public function userId(): string
+    {
+        $userId = $this->billable->{AnikeenId::getUserIdField()} ?? null;
+
+        if (empty($userId)) {
+            throw new InvalidArgumentException(sprintf('The billable has no Anikeen ID in [%s].', AnikeenId::getUserIdField()));
+        }
+
+        return (string) $userId;
+    }
+
+    /**
+     * Create a subscription for the user (it is billed only after checkout()).
+     *
+     * @param array{
+     *     group?: null|string,
+     *     name: string,
+     *     description?: null|string,
+     *     unit: string,
+     *     price: float|string,
+     *     monthly_cap?: null|float|string,
+     *     predecessor_id?: null|string,
+     *     vat_rate?: float,
+     *     payload?: null|array,
+     *     ends_at?: null|string,
+     *     trial_days?: null|int,
+     *     trial_ends_at?: null|string,
+     *     trial_once?: bool,
+     *     trial_payment_method?: null|string,
+     *     discount?: null|array{label: string, percent_off?: float|string, amount_off?: float|string, duration: string, duration_in_periods?: int},
+     *     idempotency_key?: null|string
+     * } $attributes With an idempotency_key (max. 191 characters), a retried call returns the
+     *               subscription created by the first one instead of a duplicate.
+     *               monthly_cap: net, at most this per calendar month (hour and day units only,
+     *               at most 2 decimals, not below price; null = no cap).
+     *               predecessor_id: the subscription this one replaces (a resize; same user and
+     *               app, checked out, not cancelled): both share the monthly cap within a month.
+     *               trial_days: a free trial of 1–365 days from the checkout on (status `trial`,
+     *               nothing billed; the first period is billed when it ends), or
+     *               trial_ends_at: a fixed end of the trial (ISO 8601, in the future), not both.
+     *               trial_once: refuse the trial if the user already had one with the app in the
+     *               same group (422 here, 409 "trial_already_used" on checkout).
+     *               trial_payment_method: TrialPaymentMethod::REQUIRED (default) or ::OPTIONAL,
+     *               only with a trial: with `optional` the user may confirm it without a payment
+     *               method, and without one at the trial's end it is cancelled instead of billed.
+     *               discount: e.g. a coupon, as a negative line next to each billed period:
+     *               label (shown to the user, max. 100 characters), percent_off (0.01–100) or
+     *               amount_off (net per period, at most the price), duration `once` (the first
+     *               billed period), `repeating` (duration_in_periods billed periods) or
+     *               `forever`. Not combinable with a monthly_cap.
+     *
+     * @throws ApiException 422 validation, 409 "idempotency_key_conflict", …
+     */
+    public function create(array $attributes): AppSubscription
+    {
+        return new AppSubscription(AppRequest::send('POST', 'v1/client/subscriptions', [
+            ...$attributes,
+            'user_id' => $this->userId(),
+        ])->data);
+    }
+
+    /**
+     * Find one of the user's subscriptions; null when it doesn't exist (or belongs to someone else).
+     *
+     * @throws ApiException
+     */
+    public function find(string $id): ?AppSubscription
+    {
+        try {
+            $subscription = new AppSubscription(AppRequest::send('GET', sprintf('v1/client/subscriptions/%s', $id))->data);
+        } catch (ApiException $e) {
+            if ($e->isNotFound()) {
+                return null;
+            }
+
+            throw $e;
+        }
+
+        return $subscription->user_id === $this->userId() ? $subscription : null;
+    }
+
+    /**
+     * All of the user's subscriptions, optionally filtered.
+     *
+     * @param array{group?: string, active?: bool, cancelled?: bool} $filters
+     * @return list<AppSubscription>
+     *
+     * @throws ApiException
+     */
+    public function all(array $filters = []): array
+    {
+        $subscriptions = [];
+        $page = 1;
+
+        do {
+            $result = AppRequest::send('GET', 'v1/client/subscriptions', null, [
+                ...array_map(fn ($value) => is_bool($value) ? (int) $value : $value, $filters),
+                'user_id' => $this->userId(),
+                'per_page' => 100,
+                'page' => $page,
+            ]);
+
+            foreach ($result->data as $data) {
+                $subscriptions[] = new AppSubscription($data);
+            }
+
+            $lastPage = (int) ($result->meta->last_page ?? $page);
+        } while ($page++ < $lastPage);
+
+        return $subscriptions;
+    }
+}

src/Id/Resources/BaseCollection.php

@@ -0,0 +1,96 @@
+<?php
+
+namespace Anikeen\Id\Resources;
+
+use Anikeen\Id\AnikeenId;
+use Anikeen\Id\Exceptions\CollectionException;
+use Anikeen\Id\Helpers\Paginator;
+use Anikeen\Id\Result;
+use Closure;
+use GuzzleHttp\Exception\GuzzleException;
+use GuzzleHttp\Psr7\Response;
+use JsonSerializable;
+use Throwable;
+
+/**
+ * @property bool $success
+ * @property mixed $data
+ * @property int $total
+ * @property int $status
+ * @property null|array $links
+ * @property null|array $meta
+ * @property null|Paginator $paginator
+ * @property AnikeenId $anikeenId
+ * @property Response $response
+ * @property null|Throwable $exception
+ */
+#[\AllowDynamicProperties]
+abstract class BaseCollection implements JsonSerializable
+{
+    private Closure $callable;
+    public ?Result $result = null;
+
+    /**
+     * @throws CollectionException
+     */
+    protected function __construct(callable $callable)
+    {
+        try {
+            $this->result = $callable();
+        } catch (GuzzleException $e) {
+            // no response at all (connection refused, timeout)
+            throw CollectionException::unreachable($e);
+        }
+
+        if (!$this->result->success()) {
+            throw CollectionException::fromResult($this->result);
+        }
+    }
+
+    /**
+     * @throws CollectionException
+     */
+    public static function builder(callable $callable): static
+    {
+        return new static($callable, false);
+    }
+
+    /**
+     * Returns the collection of resources as an array.
+     */
+    public function toArray(): array
+    {
+        return (array)$this->result->data;
+    }
+
+    /**
+     * Returns the collection of resources as a JSON string.
+     */
+    public function jsonSerialize(): array
+    {
+        return $this->toArray();
+    }
+
+    /**
+     * Returns the collection of resources.
+     */
+    public function paginate(): Result
+    {
+        return $this->result;
+    }
+
+    /**
+     * Returns the Resource based on the ID.
+     */
+    abstract public function find(string $id): ?BaseResource;
+
+    public function __get(string $name)
+    {
+        return $this->result->{$name} ?? null;
+    }
+
+    public function __isset(string $name): bool
+    {
+        return isset($this->result->{$name});
+    }
+}

src/Id/Resources/BaseResource.php

@@ -0,0 +1,73 @@
+<?php
+
+namespace Anikeen\Id\Resources;
+
+use Anikeen\Id\Exceptions\ApiException;
+use Anikeen\Id\Exceptions\ConfirmationRequiredException;
+use Anikeen\Id\Result;
+use GuzzleHttp\Exception\GuzzleException;
+use JsonSerializable;
+
+#[\AllowDynamicProperties]
+abstract class BaseResource implements JsonSerializable
+{
+    public Result $result;
+
+    /**
+     * @throws ApiException the request failed (status, error code; a ResourceException)
+     * @throws ConfirmationRequiredException the user has to confirm it on Anikeen ID
+     */
+    public function __construct(callable $callable)
+    {
+        try {
+            $this->result = $callable();
+        } catch (GuzzleException $e) {
+            // no response at all (connection refused, timeout)
+            throw ApiException::unreachable($e);
+        }
+
+        if (!$this->result->success()) {
+            if (($this->result->data->error ?? null) === 'confirmation_required') {
+                throw new ConfirmationRequiredException(
+                    $this->result->data->message ?? 'The user has to confirm this on Anikeen ID.',
+                    $this->result->response->getStatusCode(),
+                    $this->result->data->confirmation_url ?? null,
+                );
+            }
+
+            throw ApiException::fromResult($this->result);
+        }
+
+        foreach ($this->result->data as $key => $value) {
+            if (!property_exists($this, $key)) {
+                $this->{$key} = $value;
+            }
+        }
+    }
+
+    /**
+     * Returns the collection of resources as a JSON string.
+     */
+    public function jsonSerialize(): array
+    {
+        return $this->toArray();
+    }
+
+    /**
+     * Returns the collection of resources as an array.
+     */
+    public function toArray(): array
+    {
+        return (array)$this->result->data;
+    }
+
+    public function __get(string $name)
+    {
+        return null;
+    }
+
+    public function __isset(string $name): bool
+    {
+        return false;
+    }
+}

src/Id/Resources/CheckoutSession.php

@@ -0,0 +1,57 @@
+<?php
+
+namespace Anikeen\Id\Resources;
+
+use Anikeen\Id\Concerns\HasBillable;
+use Anikeen\Id\Concerns\IsCheckoutSession;
+use Throwable;
+
+/**
+ * A checkout session created with the user's access token, see CheckoutSessions.
+ *
+ * @property string $id
+ * @property string $user_id
+ * @property ?string $oauth_client_id
+ * @property string $status open, completed, cancelled or expired
+ * @property ?string $return_url
+ * @property ?object $metadata
+ * @property ?string $confirmation_url
+ * @property list<string> $subscription_ids
+ * @property list<object> $subscriptions
+ * @property ?string $expires_at
+ * @property ?string $completed_at
+ * @property ?string $cancelled_at
+ * @property ?string $created_at
+ */
+class CheckoutSession extends BaseResource
+{
+    use HasBillable;
+    use IsCheckoutSession;
+
+    public const STATUS_OPEN = 'open';
+    public const STATUS_COMPLETED = 'completed';
+    public const STATUS_CANCELLED = 'cancelled';
+    public const STATUS_EXPIRED = 'expired';
+
+    /**
+     * Withdraw an open session: it and its drafts are cancelled.
+     *
+     * @throws Throwable
+     */
+    public function cancel(): self
+    {
+        return (new self(fn () => $this->billable->anikeenId()
+            ->request('POST', sprintf('v1/checkout-sessions/%s/cancel', $this->id))))
+            ->setBillable($this->billable);
+    }
+
+    /**
+     * @throws Throwable
+     */
+    public function refresh(): self
+    {
+        return (new self(fn () => $this->billable->anikeenId()
+            ->request('GET', sprintf('v1/checkout-sessions/%s', $this->id))))
+            ->setBillable($this->billable);
+    }
+}

src/Id/Resources/CheckoutSessions.php

@@ -0,0 +1,58 @@
+<?php
+
+namespace Anikeen\Id\Resources;
+
+use Anikeen\Id\Concerns\HasBillable;
+use Anikeen\Id\Contracts\Billable;
+use Anikeen\Id\Exceptions\ResourceException;
+use Illuminate\Database\Eloquent\Model;
+use Throwable;
+
+/**
+ * Checkout sessions of the signed-in user, with the user's access token (any app): several
+ * subscriptions the user confirms together on Anikeen ID. Nothing is requested until a method is
+ * called.
+ */
+class CheckoutSessions
+{
+    use HasBillable;
+
+    public function __construct(Billable|Model $billable)
+    {
+        $this->billable = $billable;
+    }
+
+    /**
+     * Open a checkout session with new subscriptions and/or existing drafts of the app
+     * (`['id' => …]`); see AppCheckoutSessions::create() for the attributes (no user_id here,
+     * vat_rate only for trusted apps).
+     *
+     * @throws Throwable
+     */
+    public function create(array $attributes): CheckoutSession
+    {
+        return (new CheckoutSession(fn () => $this->billable->anikeenId()
+            ->request('POST', 'v1/checkout-sessions', $attributes)))
+            ->setBillable($this->billable);
+    }
+
+    /**
+     * A session the app created for the user; null when it doesn't exist.
+     *
+     * @throws Throwable
+     */
+    public function find(string $id): ?CheckoutSession
+    {
+        try {
+            return (new CheckoutSession(fn () => $this->billable->anikeenId()
+                ->request('GET', sprintf('v1/checkout-sessions/%s', $id))))
+                ->setBillable($this->billable);
+        } catch (ResourceException $e) {
+            if ($e->getCode() === 404) {
+                return null;
+            }
+
+            throw $e;
+        }
+    }
+}

src/Id/Resources/Countries.php

@@ -0,0 +1,18 @@
+<?php
+
+namespace Anikeen\Id\Resources;
+
+use Anikeen\Id\Concerns\HasBillable;
+
+class Countries extends BaseCollection
+{
+    use HasBillable;
+
+    /**
+     * {@inheritDoc}
+     */
+    public function find(string $id): ?BaseResource
+    {
+        return null;
+    }
+}

src/Id/Resources/Invoice.php

@@ -0,0 +1,27 @@
+<?php
+
+namespace Anikeen\Id\Resources;
+
+use Anikeen\Id\Concerns\HasBillable;
+use Throwable;
+
+/**
+ * @property string $id
+ */
+class Invoice extends BaseResource
+{
+    use HasBillable;
+
+    /**
+     * Get temporary download url from given invoice.
+     *
+     * @throws Throwable
+     */
+    public function getInvoiceTemporaryUrl(): ?string
+    {
+        return $this->billable->anikeenId()
+            ->request('GET', sprintf('v1/invoices/%s', $this->id))
+            ->data
+            ->temporary_url ?? null;
+    }
+}

src/Id/Resources/Invoices.php

@@ -0,0 +1,20 @@
+<?php
+
+namespace Anikeen\Id\Resources;
+
+use Anikeen\Id\Concerns\HasBillable;
+
+class Invoices extends BaseCollection
+{
+    use HasBillable;
+
+    /**
+     * {@inheritDoc}
+     */
+    public function find(string $id): ?Invoice
+    {
+        return (new Invoice(fn() => $this->billable->anikeenId()
+            ->request('GET', sprintf('v1/invoices/%s', $id))))
+            ->setBillable($this->billable);
+    }
+}

src/Id/Resources/Order.php

@@ -0,0 +1,142 @@
+<?php
+
+namespace Anikeen\Id\Resources;
+
+use Anikeen\Id\Concerns\HasBillable;
+use Anikeen\Id\Concerns\HasConfirmationUrl;
+use Throwable;
+
+/**
+ * @property string $id
+ * @property null|string $confirmation_url where the user confirms it (third-party apps, or `confirm`)
+ * @property null|string $oauth_client_id the app that bills the order: the app that created it, or for a monthly
+ *                                        (collective) order the app whose subscriptions it bills; collective orders
+ *                                        are kept per app. null for Anikeen's own (and legacy orders of several apps)
+ * @property null|string $group
+ * @property null|object $metadata the app's own data, returned as is
+ * @property null|string $return_url where the user returns after confirming
+ * @property null|string $expires_at when a draft created with `confirm` is cancelled unless confirmed
+ */
+class Order extends BaseResource
+{
+    use HasBillable;
+    use HasConfirmationUrl;
+
+    /**
+     * Update given order from the current user.
+     *
+     * VAT is calculated based on the billing address and shown in the order response.
+     *
+     * The billing and shipping addresses are each persisted as standalone Address entities
+     * in the database, but are also embedded (deep-copied) into the Order object itself
+     * rather than merely referenced. This guarantees that the order retains its own snapshot
+     * of both addresses for future reference.
+     *
+     * @param array{
+     *      billing_address: array{
+     *           company_name: null|string,
+     *           first_name:  null|string,
+     *           last_name: null|string,
+     *           address: null|string,
+     *           address_2: null|string,
+     *           house_number: null|string,
+     *           city: null|string,
+     *           state: null|string,
+     *           postal_code: null|string,
+     *           country_iso: string,
+     *           phone_number: null|string,
+     *           email: null|string
+     *      },
+     *      shipping_address: null|array{
+     *           company_name: null|string,
+     *           first_name: string,
+     *           last_name: string,
+     *           address: string,
+     *           address_2: null|string,
+     *           house_number: null|string,
+     *           city: string,
+     *           state: null|string,
+     *           postal_code: string,
+     *           country_iso: string,
+     *           phone_number: null|string,
+     *           email: null|string
+     *      },
+     *      group?: null|string,
+     *      metadata?: null|array
+     *  } $attributes The order data:
+     *    - billing_address:  Billing address (ISO 3166-1 alpha-2 country code)
+     *    - shipping_address: Shipping address for physical items (first name, last name, address, postal code, city, ISO 3166-1 alpha-2 country code)
+     *    - group:            The app's group (optional)
+     *    - metadata:         The app's own data (max. 50 keys), only while the order is a draft (optional)
+     * @throws Throwable
+     */
+    public function update(array $attributes = []): self
+    {
+        return (new self(fn() => $this->billable->anikeenId()
+            ->request('PUT', sprintf('v1/orders/%s', $this->id), $attributes)))
+            ->setBillable($this->billable);
+    }
+
+    /**
+     * Checkout given order from the current user.
+     *
+     * A draft created with `confirm` can't be checked out once it expired (409 "confirmation_expired").
+     *
+     * @throws Throwable
+     */
+    public function checkout(): self
+    {
+        return (new self(fn() => $this->billable->anikeenId()
+            ->request('PUT', sprintf('v1/orders/%s/checkout', $this->id))))
+            ->setBillable($this->billable);
+    }
+
+    /**
+     * Revoke given order from the current user.
+     *
+     * @throws Throwable
+     */
+    public function revoke(): self
+    {
+        return (new self(fn() => $this->billable->anikeenId()
+            ->request('PUT', sprintf('v1/orders/%s/revoke', $this->id))))
+            ->setBillable($this->billable);
+    }
+
+    /**
+     * Delete given order from the current user.
+     *
+     * @throws Throwable
+     */
+    public function delete(): bool
+    {
+        return $this->billable->anikeenId()
+            ->request('DELETE', sprintf('v1/orders/%s', $this->id))->success();
+    }
+
+    /**
+     * Deliveries of this order's goods; `create()` ships them (see Shipments::create()).
+     *
+     * @throws Throwable
+     */
+    public function shipments(): Shipments
+    {
+        return Shipments::builder(fn() => $this->billable->anikeenId()
+            ->request('GET', sprintf('v1/orders/%s/shipments', $this->id)))
+            ->setBillable($this->billable)
+            ->setParent($this);
+    }
+
+    /**
+     * Get order items from given order.
+     *
+     * @throws Throwable
+     */
+    public function orderItems(array $parameters = []): OrderItems
+    {
+        return OrderItems::builder(fn() => $this->billable->anikeenId()
+            ->request('GET', sprintf('v1/orders/%s/items', $this->id), [], $parameters))
+            ->setBillable($this->billable)
+            ->setParent($this);
+    }
+}

src/Id/Resources/OrderItem.php

@@ -0,0 +1,53 @@
+<?php
+
+namespace Anikeen\Id\Resources;
+
+use Anikeen\Id\Concerns\HasBillable;
+use Anikeen\Id\Concerns\HasParent;
+use Throwable;
+
+/**
+ * @property string $id
+ */
+class OrderItem extends BaseResource
+{
+    use HasBillable;
+    use HasParent;
+
+    /**
+     * Update given order item from given order.
+     *
+     * VAT is calculated based on the billing address and shown in the order item response.
+     *
+     * @param array{
+     *       items: array<array{
+     *           type:        string,
+     *           name:        string,
+     *           description: string,
+     *           price:       float|int,
+     *           unit:        string,
+     *           units:       int
+     *       }>
+     *   } $attributes The order data:
+     *     - items:           Array of order items, each with type, name, description, price, unit, and quantity
+     * @throws Throwable
+     */
+    public function update(array $attributes = []): self
+    {
+        return (new self(fn() => $this->billable->anikeenId()
+            ->request('PUT', sprintf('v1/orders/%s/items/%s', $this->parent->id, $this->id), $attributes)))
+            ->setBillable($this->billable)
+            ->setParent($this->parent);
+    }
+
+    /**
+     * Delete given order item from given order.
+     *
+     * @throws Throwable
+     */
+    public function delete(): bool
+    {
+        return $this->billable->anikeenId()
+            ->request('DELETE', sprintf('v1/orders/%s/items/%s', $this->parent->id, $this->id))->success();
+    }
+}

src/Id/Resources/OrderItems.php

@@ -0,0 +1,58 @@
+<?php
+
+namespace Anikeen\Id\Resources;
+
+use Anikeen\Id\Concerns\HasBillable;
+use Anikeen\Id\Concerns\HasParent;
+use Throwable;
+
+class OrderItems extends BaseCollection
+{
+    use HasBillable;
+    use HasParent;
+
+    /**
+     * Create a new order item for given order.
+     *
+     * VAT is calculated based on the billing address and shown in the order item response.
+     *
+     * @param string $orderId The order ID.
+     * @param array{
+     *      items: array<array{
+     *          type:        string,
+     *          name:        string,
+     *          description: string,
+     *          price:       float|int,
+     *          unit:        string,
+     *          units:       int
+     *      }>
+     *  } $attributes The order data:
+     *    - items:           Array of order items, each with type, name, description, price, unit, and quantity
+     *
+     * Only trusted apps may add items, and only to draft orders. Returns the first created item.
+     *
+     * @throws Throwable
+     */
+    public function create(string $orderId, array $attributes = []): OrderItem
+    {
+        return (new OrderItem(fn() => tap($this->billable->anikeenId()
+            ->request('POST', sprintf('v1/orders/%s/items', $orderId), $attributes), function ($result) {
+                if (is_array($result->data)) {
+                    $result->data = $result->data[0] ?? null;
+                }
+            })))
+            ->setBillable($this->billable)
+            ->setParent($this->parent);
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function find(string $id): ?OrderItem
+    {
+        return (new OrderItem(fn() => $this->parent->anikeenId()
+            ->request('GET', sprintf('v1/orders/%s/items/%s', $this->parent->id, $id))))
+            ->setBillable($this->billable)
+            ->setParent($this->parent);
+    }
+}

src/Id/Resources/Orders.php

@@ -0,0 +1,98 @@
+<?php
+
+namespace Anikeen\Id\Resources;
+
+use Anikeen\Id\Concerns\HasBillable;
+use Throwable;
+
+class Orders extends BaseCollection
+{
+    use HasBillable;
+
+    /**
+     * Creates a new order for the current user.
+     *
+     * VAT is calculated based on the billing address and shown in the order response.
+     *
+     * The billing and shipping addresses are each persisted as standalone Address entities
+     * in the database, but are also embedded (deep-copied) into the Order object itself
+     * rather than merely referenced. This guarantees that the order retains its own snapshot
+     * of both addresses for future reference.
+     *
+     * @param array{
+     *     billing_address: array{
+     *          company_name: null|string,
+     *          first_name:  null|string,
+     *          last_name: null|string,
+     *          address: null|string,
+     *          address_2: null|string,
+     *          house_number: null|string,
+     *          city: null|string,
+     *          state: null|string,
+     *          postal_code: null|string,
+     *          country_iso: string,
+     *          phone_number: null|string,
+     *          email: null|string
+     *     },
+     *     shipping_address: null|array{
+     *          company_name: null|string,
+     *          first_name: string,
+     *          last_name: string,
+     *          address: string,
+     *          address_2: null|string,
+     *          house_number: null|string,
+     *          city: string,
+     *          state: null|string,
+     *          postal_code: string,
+     *          country_iso: string,
+     *          phone_number: null|string,
+     *          email: null|string
+     *     },
+     *     group?: null|string,
+     *     confirm?: bool,
+     *     return_url?: null|string,
+     *     metadata?: null|array,
+     *     items: array<array{
+     *         type:         string,
+     *         name:         string,
+     *         description?: null|string,
+     *         image_url?:   null|string,
+     *         price?:       float|int|string,
+     *         gross_price?: float|int|string,
+     *         unit:         string,
+     *         units:        int
+     *     }>
+     * } $attributes The order data:
+     *   - billing_address:  Billing address (ISO 3166-1 alpha-2 country code)
+     *   - shipping_address: Shipping address for physical items (first name, last name, address, postal code, city, ISO 3166-1 alpha-2 country code)
+     *   - group:            The app's group, e.g. a team (optional)
+     *   - confirm:          Trusted apps: leave confirming and paying to the user (confirmation_url, expires after 24 hours; optional)
+     *   - return_url:       Where the user returns after confirming (same origin as one of the app's redirect URIs; optional)
+     *   - metadata:         The app's own data (max. 50 keys), returned as is in the API and webhooks (optional)
+     *   - items:            Array of order items:
+     *       - type:        digital, physical or physical-reduced (VAT category)
+     *       - price/gross_price: net or gross unit price, one of both
+     *       - unit:        hour, day, week, month, year, onetime or piece
+     *       - image_url:   http(s) URL of a product image; Anikeen ID copies it, so it stays
+     *                      visible on the order and invoice when the shop removes it later
+     * @throws Throwable
+     */
+    public function create(array $attributes = []): Order
+    {
+        return (new Order(fn() => $this->billable->anikeenId()
+            ->request('POST', 'v1/orders', $attributes)))
+            ->setBillable($this->billable);
+    }
+
+    /**
+     * Get given order from the current user.
+     *
+     * @throws Throwable
+     */
+    public function find(string $id): ?Order
+    {
+        return (new Order(fn() => $this->billable->anikeenId()
+            ->request('GET', sprintf('v1/orders/%s', $id))))
+            ->setBillable($this->billable);
+    }
+}

src/Id/Resources/PaymentMethod.php

@@ -0,0 +1,25 @@
+<?php
+
+namespace Anikeen\Id\Resources;
+
+use Anikeen\Id\Concerns\HasBillable;
+
+/**
+ * @property string $id
+ */
+class PaymentMethod extends BaseResource
+{
+    use HasBillable;
+
+    /**
+     * Remove this payment method from the current user.
+     *
+     * @throws \Throwable
+     */
+    public function delete(): bool
+    {
+        return $this->billable->anikeenId()
+            ->request('DELETE', sprintf('v1/payment-methods/%s', $this->id))
+            ->success();
+    }
+}

src/Id/Resources/PaymentMethods.php

@@ -0,0 +1,73 @@
+<?php
+
+namespace Anikeen\Id\Resources;
+
+use Anikeen\Id\Concerns\HasBillable;
+use Throwable;
+
+class PaymentMethods extends BaseCollection
+{
+    use HasBillable;
+
+    /**
+     * Check if current user has at least one payment method.
+     *
+     * @throws Throwable
+     */
+    public function hasPaymentMethod(): bool
+    {
+        return $this->result->count() > 0;
+    }
+
+    /**
+     * Check if the current user has a default payment method.
+     *
+     * @throws Throwable
+     */
+    public function hasDefaultPaymentMethod(): bool
+    {
+        return $this->defaultPaymentMethod()?->id !== null;
+    }
+
+    /**
+     * Get default payment method from the current user.
+     *
+     * @throws Throwable
+     */
+    public function defaultPaymentMethod(): PaymentMethod
+    {
+        if (!isset($this->defaultPaymentMethodCache)) {
+            $this->defaultPaymentMethodCache = (new PaymentMethod(fn() => $this->billable->anikeenId()
+                ->request('GET', 'v1/payment-methods/default')))
+                ->setBillable($this->billable);
+        }
+
+        return $this->defaultPaymentMethodCache;
+    }
+
+    /**
+     * Set the default payment method for the current user.
+     *
+     * @throws Throwable
+     */
+    public function setDefault(string $id): PaymentMethod
+    {
+        unset($this->defaultPaymentMethodCache);
+
+        return (new PaymentMethod(fn() => $this->billable->anikeenId()
+            ->request('PUT', sprintf('v1/payment-methods/%s/default', $id))))
+            ->setBillable($this->billable);
+    }
+
+    /**
+     * {@inheritDoc}
+     *
+     * @throws Throwable
+     */
+    public function find(string $id): ?PaymentMethod
+    {
+        return (new PaymentMethod(fn() => $this->billable->anikeenId()
+            ->request('GET', sprintf('v1/payment-methods/%s', $id))))
+            ->setBillable($this->billable);
+    }
+}

src/Id/Resources/Shipment.php

@@ -0,0 +1,38 @@
+<?php
+
+namespace Anikeen\Id\Resources;
+
+use Anikeen\Id\Concerns\HasBillable;
+use Anikeen\Id\Concerns\HasParent;
+use Throwable;
+
+/**
+ * @property string $id
+ * @property string $number delivery note number, e.g. LS-2026-0001
+ * @property string $order_id
+ * @property null|string $carrier
+ * @property null|string $tracking_number
+ * @property null|string $tracking_url
+ * @property array $items order_item_id, name, description, units
+ * @property object $shipping_address
+ * @property null|string $note
+ * @property string $shipped_at
+ */
+class Shipment extends BaseResource
+{
+    use HasBillable;
+    use HasParent;
+
+    /**
+     * The delivery note as PDF (binary string).
+     *
+     * @throws Throwable
+     */
+    public function deliveryNote(): string
+    {
+        $result = $this->billable->anikeenId()
+            ->request('GET', sprintf('v1/orders/%s/shipments/%s/delivery-note', $this->order_id, $this->id));
+
+        return (string) $result->response?->getBody();
+    }
+}

src/Id/Resources/Shipments.php

@@ -0,0 +1,63 @@
+<?php
+
+namespace Anikeen\Id\Resources;
+
+use Anikeen\Id\Concerns\HasBillable;
+use Anikeen\Id\Concerns\HasParent;
+use Throwable;
+
+/**
+ * Deliveries of an order's physical goods. Each one adds a delivery note to the customer's
+ * order documents on Anikeen ID.
+ */
+class Shipments extends BaseCollection
+{
+    use HasBillable;
+    use HasParent;
+
+    /**
+     * Ship goods of a paid order. Only the app that created the order (or a trusted app) can.
+     *
+     * Without `items`, everything physical that hasn't been shipped yet is shipped. Items and
+     * the shipping address are stored as they are now; the user sees them on the delivery note.
+     *
+     * @param array{
+     *     carrier?: string,
+     *     tracking_number?: string,
+     *     tracking_url?: string,
+     *     note?: string,
+     *     shipped_at?: string,
+     *     notify_customer?: bool,
+     *     items?: array<array{order_item_id: string, units?: float|int|string}>
+     * } $attributes
+     *   - carrier:         e.g. "DHL"
+     *   - tracking_url:    http(s) link to track the parcel, shown to the user
+     *   - shipped_at:      when it was sent (default: now, not in the future)
+     *   - notify_customer: Anikeen ID mails the user with the delivery note (default true);
+     *                      false if your shop sends its own mail
+     *   - items:           physical items of the order and how many of them (default: all left)
+     *
+     * Errors (ResourceException with the HTTP status): 409 when the order isn't paid or nothing
+     * is left to ship, 422 for items that aren't physical items of the order or exceed what's left.
+     *
+     * @throws Throwable
+     */
+    public function create(array $attributes = []): Shipment
+    {
+        return (new Shipment(fn() => $this->billable->anikeenId()
+            ->request('POST', sprintf('v1/orders/%s/shipments', $this->parent->id), $attributes)))
+            ->setBillable($this->billable)
+            ->setParent($this->parent);
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function find(string $id): ?Shipment
+    {
+        return (new Shipment(fn() => $this->billable->anikeenId()
+            ->request('GET', sprintf('v1/orders/%s/shipments/%s', $this->parent->id, $id))))
+            ->setBillable($this->billable)
+            ->setParent($this->parent);
+    }
+}

src/Id/Resources/SocialiteUser.php

@@ -0,0 +1,18 @@
+<?php
+
+namespace Anikeen\Id\Resources;
+
+/**
+ * @property string $id
+ * @property string $user_id
+ * @property string $driver
+ * @property string $uid
+ * @property string|null $display_name
+ * @property string|null $avatar
+ * @property string|null $expires_at
+ * @property string $created_at
+ * @property string $updated_at
+ */
+class SocialiteUser extends BaseResource
+{
+}

src/Id/Resources/SocialiteUsers.php

@@ -0,0 +1,15 @@
+<?php
+
+namespace Anikeen\Id\Resources;
+
+use Anikeen\Id\Concerns\HasParent;
+
+class SocialiteUsers extends BaseCollection
+{
+    use HasParent;
+
+    public function find(string $id): ?SocialiteUser
+    {
+        return null;
+    }
+}

src/Id/Resources/SshKey.php

@@ -0,0 +1,34 @@
+<?php
+
+namespace Anikeen\Id\Resources;
+
+use Anikeen\Id\Concerns\HasParent;
+use Throwable;
+
+/**
+ * @property string $id
+ */
+class SshKey extends BaseResource
+{
+    use HasParent;
+
+    /**
+     * Deletes a given ssh key for the currently authed user.
+     *
+     * @throws Throwable
+     */
+    /**
+     * Rename the SSH key.
+     *
+     * @throws Throwable
+     */
+    public function update(string $name): self
+    {
+        return (new self(fn() => $this->parent->put(sprintf('v1/ssh-keys/%s', $this->id), ['name' => $name])))->setParent($this->parent);
+    }
+
+    public function delete(): bool
+    {
+        return $this->parent->delete(sprintf('v1/ssh-keys/%s', $this->id))->success();
+    }
+}

src/Id/Resources/SshKeys.php

@@ -0,0 +1,34 @@
+<?php
+
+namespace Anikeen\Id\Resources;
+
+use Anikeen\Id\Concerns\HasParent;
+use Throwable;
+
+class SshKeys extends BaseCollection
+{
+    use HasParent;
+
+    /**
+     * Creates ssh key for the currently authed user.
+     *
+     * @param string $publicKey The public key to be added
+     * @param string|null $name The name of the key (optional)
+     * @throws Throwable
+     */
+    public function create(string $publicKey, ?string $name = null): SshKey
+    {
+        return (new SshKey(fn() => $this->parent->post('v1/ssh-keys', [
+            'public_key' => $publicKey,
+            'name' => $name,
+        ])))->setParent($this->parent);
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function find(string $id): ?SshKey
+    {
+        return (new SshKey(fn() => $this->parent->get(sprintf('v1/ssh-keys/%s', $id))))->setParent($this->parent);
+    }
+}

src/Id/Resources/Subscription.php

@@ -0,0 +1,124 @@
+<?php
+
+namespace Anikeen\Id\Resources;
+
+use Anikeen\Id\Concerns\HasBillable;
+use Anikeen\Id\Concerns\HasConfirmationUrl;
+use Anikeen\Id\Concerns\HasSubscriptionStatus;
+use Anikeen\Id\Contracts\AppTokenRepository;
+use Throwable;
+
+/**
+ * @property string $id
+ * @property string $name
+ * @property string $description
+ * @property string $unit
+ * @property float $price
+ * @property ?float $monthly_cap net, at most this per calendar month (hour and day units)
+ * @property ?float $expected_monthly_price gross estimate for a month (720 hours, at most the monthly cap)
+ * @property ?string $predecessor_id the subscription this one replaced (a resize); they share the monthly cap
+ * @property float $vat_rate
+ * @property array $payload
+ * @property bool $active
+ * @property bool $autorenew
+ * @property bool $cancelled
+ * @property ?string $status draft, trial, active, paused, cancelling, expired or cancelled, see status()
+ * @property ?string $starts_at
+ * @property string $ends_at
+ * @property ?string $cancels_at when a scheduled cancellation takes effect
+ * @property ?string $trial_ends_at
+ * @property ?string $trial_payment_method required or optional with a trial (TrialPaymentMethod), null without
+ * @property ?string $cancellation_reason why the billing cancelled it (CancellationReason), null otherwise
+ * @property ?object $discount {label, percent_off, amount_off, duration, duration_in_periods, periods_remaining}; periods_remaining is null for `forever`, 0 once it ended
+ * @property null|string $confirmation_url where the user confirms it (third-party apps)
+ */
+class Subscription extends BaseResource
+{
+    use HasBillable;
+    use HasConfirmationUrl;
+    use HasSubscriptionStatus;
+
+    /**
+     * Update a given subscription from the current user.
+     *
+     * @param array{
+     *      group: string,
+     *      name: string,
+     *      description: null|string,
+     *      unit: string,
+     *      price: float,
+     *      monthly_cap?: null|float,
+     *      vat_rate: float,
+     *      payload: null|array,
+     *      ends_at: null|string
+     *  } $attributes The subscription data:
+     *    - group:          The group (optional)
+     *    - name:           The name (required when set)
+     *    - description:    The description (optional)
+     *    - unit:           The unit (required when set, e.g. "hour", "day", "week", "month", "year")
+     *    - price:          The price per unit (required when set)
+     *    - monthly_cap:    Net, at most this per calendar month (hour and day units; optional)
+     *    - vat_rate:       The VAT rate (required when set)
+     *    - payload:        The payload (optional)
+     *    - ends_at:        The end date (optional)
+     * @throws Throwable
+     */
+    public function update(array $attributes): self
+    {
+        return (new self(fn() => $this->billable->anikeenId()
+            ->request('PUT', sprintf('v1/subscriptions/%s', $this->id), $attributes)))
+            ->setBillable($this->billable);
+    }
+
+    /**
+     * Force given subscription to check out (trusted apps only).
+     *
+     * @throws Throwable
+     */
+    public function checkout(): self
+    {
+        return (new self(fn() => $this->billable->anikeenId()
+            ->request('PUT', sprintf('v1/subscriptions/%s/checkout', $this->id))))
+            ->setBillable($this->billable);
+    }
+
+    /**
+     * Revoke a given running subscription from the current user.
+     *
+     * @throws Throwable
+     */
+    public function revoke(bool $refund = false): self
+    {
+        $attributes = [
+            'refund' => $refund,
+        ];
+
+        return (new self(fn() => $this->billable->anikeenId()
+            ->request('PUT', sprintf('v1/subscriptions/%s/revoke', $this->id), $attributes)))
+            ->setBillable($this->billable);
+    }
+
+    /**
+     * Pause a given running subscription from the current user.
+     *
+     * @throws Throwable
+     */
+    public function pause(): self
+    {
+        return (new self(fn() => $this->billable->anikeenId()
+            ->request('PUT', sprintf('v1/subscriptions/%s/pause', $this->id))))
+            ->setBillable($this->billable);
+    }
+
+    /**
+     * Resume a given running subscription from the current user.
+     *
+     * @throws Throwable
+     */
+    public function resume(): self
+    {
+        return (new self(fn() => $this->billable->anikeenId()
+            ->request('PUT', sprintf('v1/subscriptions/%s/resume', $this->id))))
+            ->setBillable($this->billable);
+    }
+}

src/Id/Resources/Subscriptions.php

@@ -0,0 +1,69 @@
+<?php
+
+namespace Anikeen\Id\Resources;
+
+use Anikeen\Id\Concerns\HasBillable;
+use Anikeen\Id\Contracts\AppTokenRepository;
+use Anikeen\Id\Exceptions\ResourceException;
+use Throwable;
+
+class Subscriptions extends BaseCollection
+{
+    use HasBillable;
+
+    /**
+     * Create a new subscription for the current user.
+     *
+     * @param array{
+     *      group: null|string,
+     *      name: string,
+     *      description: null|string,
+     *      unit: string,
+     *      price: float,
+     *      monthly_cap?: null|float,
+     *      predecessor_id?: null|string,
+     *      vat_rate: float,
+     *      payload: null|array,
+     *      ends_at: null|string,
+     *      trial_days?: null|int,
+     *      trial_ends_at?: null|string,
+     *      trial_once?: bool,
+     *      trial_payment_method?: null|string,
+     *      discount?: null|array{label: string, percent_off?: float|string, amount_off?: float|string, duration: string, duration_in_periods?: int}
+     *  } $attributes The subscription data:
+     *    - group:          The group (optional)
+     *    - name:           The name
+     *    - description:    The description (optional)
+     *    - unit:           The unit (e.g. "hour", "day", "week", "month", "year")
+     *    - price:          The price per unit
+     *    - monthly_cap:    Net, at most this per calendar month (hour and day units, max. 2 decimals; optional)
+     *    - predecessor_id: The subscription this one replaces (a resize); both share the monthly cap (optional)
+     *    - vat_rate:       The VAT rate (required when set)
+     *    - payload:        The payload (optional)
+     *    - ends_at:        The end date (optional)
+     *    - trial_days:     A free trial of 1–365 days from the user's confirmation on (optional)
+     *    - trial_ends_at:  Or a fixed end of the free trial (ISO 8601, in the future; optional)
+     *    - trial_once:     Refuse the trial if the user already had one with the app in the group (optional)
+     *    - trial_payment_method: TrialPaymentMethod::REQUIRED (default) or ::OPTIONAL, only with a trial (optional)
+     *    - discount:       A discount per billed period, see AppSubscriptions::create() (optional)
+     * @throws Throwable
+     */
+    public function create(array $attributes): Subscription
+    {
+        return (new Subscription(fn() => $this->billable->anikeenId()
+            ->request('POST', 'v1/subscriptions', $attributes)))
+            ->setBillable($this->billable);
+    }
+
+    /**
+     * {@inheritDoc}
+     *
+     * @throws ResourceException
+     */
+    public function find(string $id): ?Subscription
+    {
+        return (new Subscription(fn() => $this->billable->anikeenId()
+            ->request('GET', sprintf('v1/subscriptions/%s', $id))))
+            ->setBillable($this->billable);
+    }
+}

src/Id/Resources/Transaction.php

@@ -0,0 +1,10 @@
+<?php
+
+namespace Anikeen\Id\Resources;
+
+use Anikeen\Id\Concerns\HasBillable;
+
+class Transaction extends BaseResource
+{
+    use HasBillable;
+}

src/Id/Resources/Transactions.php

@@ -0,0 +1,20 @@
+<?php
+
+namespace Anikeen\Id\Resources;
+
+use Anikeen\Id\Concerns\HasBillable;
+
+class Transactions extends BaseCollection
+{
+    use HasBillable;
+
+    /**
+     * {@inheritDoc}
+     */
+    public function find(string $id): ?Transaction
+    {
+        return (new Transaction(fn() => $this->billable->anikeenId()
+            ->request('GET', sprintf('v1/transactions/%s', $id))))
+            ->setBillable($this->billable);
+    }
+}

src/Id/Result.php

@@ -179,7 +179,7 @@ class Result
     /**
      * Rate limit info from headers
      */
-    public function rateLimit(string $key = null): array|int|string|null
+    public function rateLimit(?string $key = null): array|int|string|null
     {
         if (!$this->response) {
             return null;

src/Id/Socialite/AnikeenIdExtendSocialite.php

@@ -8,6 +8,6 @@ class AnikeenIdExtendSocialite
 {
     public function handle(SocialiteWasCalled $socialiteWasCalled): void
     {
-        $socialiteWasCalled->extendSocialite('anikeen-id', Provider::class);
+        $socialiteWasCalled->extendSocialite('anikeen', Provider::class);
     }
 }

src/Id/Socialite/Provider.php

@@ -2,8 +2,10 @@
 
 namespace Anikeen\Id\Socialite;
 
+use Anikeen\Id\AnikeenId;
 use Anikeen\Id\Enums\Scope;
 use GuzzleHttp\Exception\GuzzleException;
+use Illuminate\Http\Request;
 use Illuminate\Support\Arr;
 use Laravel\Socialite\Two\ProviderInterface;
 use SocialiteProviders\Manager\OAuth2\AbstractProvider;
@@ -14,7 +16,7 @@ class Provider extends AbstractProvider implements ProviderInterface
     /**
      * Unique Provider Identifier.
      */
-    const IDENTIFIER = 'ANIKEEN_ID';
+    const IDENTIFIER = 'ANIKEEN';
 
     /**
      * {@inheritdoc}
@@ -26,13 +28,21 @@ class Provider extends AbstractProvider implements ProviderInterface
      */
     protected $scopeSeparator = ' ';
 
+    /**
+     * Get the base URL for the API.
+     */
+    protected function getBaseUrl(): string
+    {
+        return app(AnikeenId::class)->getBaseUrl();
+    }
+
     /**
      * {@inheritdoc}
      */
     protected function getAuthUrl($state): string
     {
         return $this->buildAuthUrlFromBase(
-            'https://id.anikeen.com/oauth/authorize', $state
+            $this->getBaseUrl() . '/oauth/authorize', $state
         );
     }
 
@@ -41,7 +51,7 @@ class Provider extends AbstractProvider implements ProviderInterface
      */
     protected function getTokenUrl(): string
     {
-        return 'https://id.anikeen.com/oauth/token';
+        return $this->getBaseUrl() . '/oauth/token';
     }
 
     /**
@@ -52,7 +62,7 @@ class Provider extends AbstractProvider implements ProviderInterface
     protected function getUserByToken($token)
     {
         $response = $this->getHttpClient()->get(
-            'https://id.anikeen.com/api/v1/user', [
+            $this->getBaseUrl() . '/api/v1/user', [
             'headers' => [
                 'Accept' => 'application/json',
                 'Authorization' => 'Bearer ' . $token,
@@ -85,4 +95,12 @@ class Provider extends AbstractProvider implements ProviderInterface
             'grant_type' => 'authorization_code',
         ]);
     }
+
+    /**
+     * Returns the user logout url for the provider.
+     */
+    public function getLogoutUrl(string $redirect = null): string
+    {
+        return app(AnikeenId::class)->getBaseUrl() . '/logout?redirect=' . urlencode($redirect ?: '/');
+    }
 }

src/Id/Support/AppRequest.php

@@ -0,0 +1,62 @@
+<?php
+
+namespace Anikeen\Id\Support;
+
+use Anikeen\Id\AnikeenId;
+use Anikeen\Id\Contracts\AppTokenRepository;
+use Anikeen\Id\Exceptions\ApiException;
+use Anikeen\Id\Result;
+use GuzzleHttp\Exception\GuzzleException;
+use Throwable;
+
+/**
+ * Sends a request with the app's own token (client credentials). A rejected token is renewed
+ * once; every failure ends in an ApiException with status and error code.
+ */
+final class AppRequest
+{
+    /**
+     * @throws ApiException
+     */
+    public static function send(string $method, string $path, ?array $payload = null, array $query = []): Result
+    {
+        $result = self::attempt($method, $path, $payload, $query);
+
+        if ($result->status === 401) {
+            $tokens = app(AppTokenRepository::class);
+
+            if (method_exists($tokens, 'forgetAccessToken')) {
+                $tokens->forgetAccessToken();
+                $result = self::attempt($method, $path, $payload, $query);
+            }
+        }
+
+        if (!$result->success()) {
+            $body = is_object($result->data) ? $result->data : null;
+
+            throw new ApiException(
+                sprintf('Anikeen ID request %s %s failed: %s', $method, $path, $body->message ?? $result->error()),
+                $result->response()?->getStatusCode() ?? 0,
+                $body->error ?? null,
+                $result->exception,
+            );
+        }
+
+        return $result;
+    }
+
+    /**
+     * @throws ApiException
+     */
+    private static function attempt(string $method, string $path, ?array $payload, array $query): Result
+    {
+        try {
+            return app(AnikeenId::class)->asApp()->request($method, $path, $payload, $query);
+        } catch (ApiException $e) {
+            throw $e;
+        } catch (GuzzleException|Throwable $e) {
+            // network errors / timeouts (ConnectException isn't a RequestException) and token errors
+            throw new ApiException(sprintf('Anikeen ID is not reachable: %s', $e->getMessage()), 0, null, $e);
+        }
+    }
+}

src/Id/Webhooks/EventType.php

@@ -0,0 +1,71 @@
+<?php
+
+namespace Anikeen\Id\Webhooks;
+
+/**
+ * The `type` of webhook events Anikeen ID sends, e.g.
+ * `match ($event['type']) { EventType::CHECKOUT_COMPLETED => …, … }`.
+ */
+final class EventType
+{
+    public const ORDER_CREATED = 'order.created';
+    public const ORDER_COMPLETED = 'order.completed';
+    public const ORDER_PAYMENT_FAILED = 'order.payment_failed';
+    public const ORDER_CANCELLED = 'order.cancelled';
+    public const ORDER_SHIPPED = 'order.shipped';
+
+    public const SUBSCRIPTION_CREATED = 'subscription.created';
+    public const SUBSCRIPTION_ACTIVATED = 'subscription.activated';
+    public const SUBSCRIPTION_PAUSED = 'subscription.paused';
+    public const SUBSCRIPTION_RESUMED = 'subscription.resumed';
+    /** `data.reason`: why the billing cancelled it (CancellationReason, e.g. a trial that ended without a payment method), else null. */
+    public const SUBSCRIPTION_CANCELLED = 'subscription.cancelled';
+    public const SUBSCRIPTION_EXPIRED = 'subscription.expired';
+
+    /**
+     * The free trial of a running subscription ends in a few days (see trial_ends_at); billing
+     * starts then. `data.payment_method_missing`: the user has no payment method yet (with
+     * trial_payment_method `optional` the subscription then ends with the trial).
+     */
+    public const SUBSCRIPTION_TRIAL_WILL_END = 'subscription.trial_will_end';
+
+    /** The last discounted period of a subscription was billed; the following ones are billed at the full price. */
+    public const SUBSCRIPTION_DISCOUNT_ENDED = 'subscription.discount_ended';
+
+    /**
+     * The price, unit, name, description or discount of a running subscription changed (right away
+     * or at the period end); `data.previous_attributes` has the changed fields' old values.
+     */
+    public const SUBSCRIPTION_UPDATED = 'subscription.updated';
+
+    /**
+     * A period of a subscription was booked on its collective order, the first one included;
+     * `data.period` describes it, `data.period.first_period` is true for the subscription's first
+     * paid period (checkout or the end of a free trial). Opt-in: only endpoints that select this
+     * event get it (not through `*`).
+     */
+    public const SUBSCRIPTION_RENEWED = 'subscription.renewed';
+
+    /** The user confirmed a checkout session: all of its subscriptions are running (sent after their subscription.activated). */
+    public const CHECKOUT_COMPLETED = 'checkout.completed';
+
+    /** The user or the app cancelled a checkout session; its drafts were cancelled. */
+    public const CHECKOUT_CANCELLED = 'checkout.cancelled';
+
+    /** A checkout session was not confirmed within 24 hours; its drafts were cancelled. */
+    public const CHECKOUT_EXPIRED = 'checkout.expired';
+
+    public const TEST = 'webhook.test';
+
+    /**
+     * @return list<string>
+     */
+    public static function all(): array
+    {
+        return array_values((new \ReflectionClass(self::class))->getConstants());
+    }
+
+    private function __construct()
+    {
+    }
+}

src/Id/Webhooks/Webhook.php

@@ -0,0 +1,71 @@
+<?php
+
+namespace Anikeen\Id\Webhooks;
+
+use Anikeen\Id\Exceptions\SignatureVerificationException;
+
+/**
+ * Verifies webhooks from Anikeen ID, like Stripe's Webhook::constructEvent().
+ *
+ * Anikeen ID signs every request with your endpoint's signing secret (whsec_…):
+ * `Anikeen-Signature: t=<unix time>,v1=<hex HMAC-SHA256 of "<t>.<raw body>">`.
+ */
+final class Webhook
+{
+    /** Requests older (or newer) than this many seconds are rejected to prevent replays. */
+    public const DEFAULT_TOLERANCE = 300;
+
+    /**
+     * Verifies the signature and returns the event: ['id', 'type', 'created', 'data' => ['object' => …]].
+     *
+     * @param  string  $payload  the raw request body (not re-encoded JSON)
+     * @param  string|null  $signatureHeader  the Anikeen-Signature header
+     *
+     * @throws SignatureVerificationException
+     */
+    public static function constructEvent(string $payload, ?string $signatureHeader, string $secret, int $tolerance = self::DEFAULT_TOLERANCE): array
+    {
+        self::verify($payload, $signatureHeader, $secret, $tolerance);
+
+        $event = json_decode($payload, true);
+
+        if (!is_array($event) || !isset($event['id'], $event['type'])) {
+            throw new SignatureVerificationException('The webhook payload is not a valid event.');
+        }
+
+        return $event;
+    }
+
+    /**
+     * @throws SignatureVerificationException
+     */
+    public static function verify(string $payload, ?string $signatureHeader, string $secret, int $tolerance = self::DEFAULT_TOLERANCE): void
+    {
+        $timestamp = null;
+        $signatures = [];
+
+        foreach (explode(',', (string) $signatureHeader) as $part) {
+            [$key, $value] = array_pad(explode('=', trim($part), 2), 2, null);
+
+            if ($key === 't' && ctype_digit((string) $value)) {
+                $timestamp = (int) $value;
+            } elseif ($key === 'v1' && $value) {
+                $signatures[] = $value;
+            }
+        }
+
+        if ($timestamp === null || $signatures === []) {
+            throw new SignatureVerificationException('The Anikeen-Signature header is missing or malformed.');
+        }
+
+        $expected = hash_hmac('sha256', "{$timestamp}.{$payload}", $secret);
+
+        if (!array_filter($signatures, fn (string $signature) => hash_equals($expected, $signature))) {
+            throw new SignatureVerificationException('The webhook signature does not match. Check the signing secret.');
+        }
+
+        if ($tolerance > 0 && abs(time() - $timestamp) > $tolerance) {
+            throw new SignatureVerificationException('The webhook timestamp is outside the tolerance.');
+        }
+    }
+}

tests/Id/AppOrdersTest.php

@@ -0,0 +1,134 @@
+<?php
+
+namespace Anikeen\Id\Tests;
+
+use Anikeen\Id\AnikeenId;
+use Anikeen\Id\Billable;
+use Anikeen\Id\Exceptions\ApiException;
+use GuzzleHttp\Psr7\Response;
+use Illuminate\Database\Eloquent\Model;
+
+class AppOrdersTest extends TestCase
+{
+    private function owner(): Model
+    {
+        $owner = new class extends Model {
+            use Billable;
+
+            protected $guarded = [];
+        };
+        $owner->anikeen_id = '01JUSER';
+
+        return $owner;
+    }
+
+    private function page(array $orders, int $page = 1, int $last = 1): array
+    {
+        return ['data' => $orders, 'meta' => ['current_page' => $page, 'last_page' => $last, 'total' => count($orders)], 'links' => ['next' => null]];
+    }
+
+    private function requestQuery(int $index): array
+    {
+        parse_str($this->sent[$index]['request']->getUri()->getQuery(), $query);
+
+        return $query;
+    }
+
+    public function test_pending_orders_of_a_user(): void
+    {
+        $this->respond(200, $this->page([['id' => 'o1', 'user_id' => '01JUSER', 'status' => 'pending', 'gross_total' => 11.9, 'next_payment_attempt_at' => null, 'payment_attempts' => 4]]));
+
+        $orders = $this->owner()->appOrders()->pending();
+
+        $this->assertSame('o1', $orders[0]->id);
+        $this->assertSame(4, $orders[0]->payment_attempts);
+        $request = $this->sent[0]['request'];
+        $this->assertSame('GET /api/v1/client/orders Bearer app-token', $request->getMethod() . ' ' . $request->getUri()->getPath() . ' ' . $request->getHeaderLine('Authorization'));
+        $this->assertSame(['status' => 'pending', 'user_id' => '01JUSER', 'per_page' => '100', 'page' => '1'], $this->requestQuery(0));
+    }
+
+    public function test_pending_orders_of_all_users_follow_pages(): void
+    {
+        $this->respond(200, $this->page([['id' => 'o1', 'user_id' => 'a']], 1, 2));
+        $this->respond(200, $this->page([['id' => 'o2', 'user_id' => 'b']], 2, 2));
+
+        $orders = app(AnikeenId::class)->appOrders()->pending(['group' => 'team-1']);
+
+        $this->assertSame(['o1', 'o2'], array_map(fn ($o) => $o->id, $orders));
+        $this->assertSame(['group' => 'team-1', 'status' => 'pending', 'per_page' => '100', 'page' => '2'], $this->requestQuery(1));
+    }
+
+    public function test_find_returns_null_for_unknown_and_other_users_orders(): void
+    {
+        $this->respond(404, ['message' => 'Order not found.', 'error' => 'order_not_found']);
+        $this->respond(200, ['data' => ['id' => 'o1', 'user_id' => 'someone-else']]);
+        $this->respond(200, ['data' => ['id' => 'o1', 'user_id' => '01JUSER']]);
+
+        $orders = $this->owner()->appOrders();
+
+        $this->assertNull($orders->find('unknown'));
+        $this->assertNull($orders->find('o1'));
+        $this->assertSame('o1', $orders->find('o1')->id);
+    }
+
+    public function test_orders_list_their_lines_and_invoice(): void
+    {
+        $this->respond(200, ['data' => [
+            'id' => 'o1',
+            'user_id' => '01JUSER',
+            'group' => 'team-1',
+            'metadata' => ['topup' => '7'],
+            'items' => [
+                ['id' => 'i1', 'subscription_id' => '01JSUB', 'units' => 1, 'price' => 10, 'period_start' => '2026-11-01T00:00:00+00:00', 'period_end' => '2026-12-01T00:00:00+00:00', 'net_amount' => 10, 'discount' => null],
+                ['id' => 'i2', 'subscription_id' => '01JSUB', 'units' => 1, 'price' => -2, 'period_start' => '2026-11-01T00:00:00+00:00', 'period_end' => '2026-12-01T00:00:00+00:00', 'net_amount' => -2, 'discount' => ['label' => 'SUMMER20', 'percent_off' => 20, 'amount_off' => null]],
+            ],
+            'invoice' => ['id' => 'inv1', 'number' => 'RE-2026-0001', 'status' => 'completed', 'pdf_url' => 'https://id.test/api/v1/client/orders/o1/invoice'],
+        ]]);
+
+        $order = $this->owner()->appOrders()->find('o1');
+
+        $this->assertSame('7', $order->metadata->topup);
+        $this->assertSame(8, array_sum(array_map(fn ($item) => $item->net_amount, array_filter($order->items, fn ($item) => $item->subscription_id === '01JSUB'))));
+        $this->assertSame('SUMMER20', $order->items[1]->discount->label);
+        $this->assertSame('RE-2026-0001', $order->invoice->number);
+    }
+
+    public function test_the_invoice_pdf_is_downloaded_with_the_app_token(): void
+    {
+        $this->http->append(new Response(200, ['Content-Type' => 'application/pdf'], '%PDF-1.7 invoice'));
+        $this->respond(200, ['data' => ['id' => 'o1', 'user_id' => '01JUSER']]);
+        $this->http->append(new Response(200, ['Content-Type' => 'application/pdf'], '%PDF-1.7 invoice'));
+
+        $this->assertSame('%PDF-1.7 invoice', app(AnikeenId::class)->appOrders()->invoicePdf('o1'));
+        $this->assertSame('%PDF-1.7 invoice', $this->owner()->appOrders()->invoicePdf('o1'));
+
+        $calls = array_map(fn ($entry) => $entry['request']->getMethod() . ' ' . $entry['request']->getUri()->getPath() . ' ' . $entry['request']->getHeaderLine('Authorization'), $this->sent);
+        $this->assertSame([
+            'GET /api/v1/client/orders/o1/invoice Bearer app-token',
+            'GET /api/v1/client/orders/o1 Bearer app-token',
+            'GET /api/v1/client/orders/o1/invoice Bearer app-token',
+        ], $calls);
+    }
+
+    public function test_an_invoice_that_is_not_ready_is_a_conflict(): void
+    {
+        $this->respond(409, ['message' => 'The invoice document is still being created.', 'error' => 'invoice_not_ready']);
+        $this->respond(200, ['data' => ['id' => 'o1', 'user_id' => 'someone-else']]);
+
+        try {
+            app(AnikeenId::class)->appOrders()->invoicePdf('o1');
+            $this->fail('Expected an ApiException.');
+        } catch (ApiException $e) {
+            $this->assertTrue($e->isConflict());
+            $this->assertSame('invoice_not_ready', $e->error);
+        }
+
+        try {
+            $this->owner()->appOrders()->invoicePdf('o1');
+            $this->fail('Expected an ApiException.');
+        } catch (ApiException $e) {
+            $this->assertTrue($e->isNotFound());
+            $this->assertSame('order_not_found', $e->error);
+        }
+    }
+}

tests/Id/AppSubscriptionsTest.php

@@ -0,0 +1,279 @@
+<?php
+
+namespace Anikeen\Id\Tests;
+
+use Anikeen\Id\AnikeenId;
+use Anikeen\Id\Billable;
+use Anikeen\Id\Enums\CancellationReason;
+use Anikeen\Id\Enums\TrialPaymentMethod;
+use Anikeen\Id\Exceptions\ApiException;
+use Anikeen\Id\Resources\AppSubscription;
+use GuzzleHttp\Exception\ConnectException;
+use GuzzleHttp\Psr7\Request;
+use Illuminate\Database\Eloquent\Model;
+use InvalidArgumentException;
+
+class AppSubscriptionsTest extends TestCase
+{
+    private function owner(?string $anikeenId = '01JUSER'): Model
+    {
+        $owner = new class extends Model {
+            use Billable;
+
+            protected $guarded = [];
+        };
+        $owner->anikeen_id = $anikeenId;
+        $owner->anikeen_id_access_token = 'user-token';
+
+        return $owner;
+    }
+
+    private function subscription(array $overrides = []): array
+    {
+        return ['data' => ['id' => '01JSUB', 'user_id' => '01JUSER', 'name' => 'Server', 'active' => false, 'cancelled' => false, ...$overrides]];
+    }
+
+    public function test_create_sends_the_user_id_with_the_app_token(): void
+    {
+        $this->respond(201, $this->subscription());
+
+        $subscription = $this->owner()->appSubscriptions()->create(['group' => 'team-1', 'name' => 'Server', 'unit' => 'hour', 'price' => '0.0137', 'idempotency_key' => 'server:1']);
+
+        $request = $this->sent[0]['request'];
+        $this->assertSame('POST', $request->getMethod());
+        $this->assertSame('/api/v1/client/subscriptions', $request->getUri()->getPath());
+        $this->assertSame('Bearer app-token', $request->getHeaderLine('Authorization'));
+        $this->assertSame(['group' => 'team-1', 'name' => 'Server', 'unit' => 'hour', 'price' => '0.0137', 'idempotency_key' => 'server:1', 'user_id' => '01JUSER'], $this->sentJson(0));
+        $this->assertSame('01JSUB', $subscription->id);
+    }
+
+    public function test_nothing_is_requested_until_a_method_is_called(): void
+    {
+        $this->owner()->appSubscriptions();
+
+        $this->assertCount(0, $this->sent);
+    }
+
+    public function test_actions_use_the_app_endpoints(): void
+    {
+        $this->respond(201, $this->subscription());
+        $this->respond(200, $this->subscription(['active' => true]));
+        $this->respond(200, $this->subscription(['active' => true, 'autorenew' => false]));
+        $this->respond(200, $this->subscription(['active' => true, 'autorenew' => true]));
+        $this->respond(200, $this->subscription(['cancelled' => true]));
+
+        $subscription = $this->owner()->appSubscriptions()->create(['name' => 'Server', 'unit' => 'hour', 'price' => 1]);
+
+        $this->assertTrue($subscription->checkout()->active);
+        $this->assertFalse($subscription->pause()->autorenew);
+        $this->assertTrue($subscription->resume()->autorenew);
+        $this->assertTrue($subscription->revoke(refund: true)->cancelled);
+
+        $this->assertSame([
+            'POST /api/v1/client/subscriptions',
+            'PUT /api/v1/client/subscriptions/01JSUB/checkout',
+            'PUT /api/v1/client/subscriptions/01JSUB/pause',
+            'PUT /api/v1/client/subscriptions/01JSUB/resume',
+            'PUT /api/v1/client/subscriptions/01JSUB/revoke',
+        ], array_map(fn ($entry) => $entry['request']->getMethod() . ' ' . $entry['request']->getUri()->getPath(), $this->sent));
+        $this->assertSame(['refund' => true], $this->sentJson(4));
+    }
+
+    public function test_a_running_service_is_checked_out_from_its_start(): void
+    {
+        $this->respond(201, $this->subscription());
+        $this->respond(200, $this->subscription(['active' => true]));
+
+        $subscription = $this->owner()->appSubscriptions()->create(['name' => '.de TLD', 'unit' => 'year', 'price' => '5.19']);
+        $subscription->checkout(new \DateTimeImmutable('2026-05-19 11:33:58', new \DateTimeZone('UTC')));
+
+        $this->assertSame(['starts_at' => '2026-05-19T11:33:58+00:00'], $this->sentJson(1));
+    }
+
+    public function test_errors_carry_status_and_error_code(): void
+    {
+        $this->respond(409, ['message' => 'Product subscription has already been cancelled.', 'error' => 'already_cancelled']);
+
+        try {
+            $this->owner()->appSubscriptions()->create(['name' => 'Server', 'unit' => 'hour', 'price' => 1]);
+            $this->fail('Expected an ApiException.');
+        } catch (ApiException $e) {
+            $this->assertSame(409, $e->status);
+            $this->assertSame('already_cancelled', $e->error);
+            $this->assertTrue($e->isConflict());
+            $this->assertFalse($e->isTemporary());
+        }
+    }
+
+    public function test_find_returns_null_for_unknown_subscriptions_and_other_users(): void
+    {
+        $this->respond(404, ['message' => 'Subscription not found.', 'error' => 'subscription_not_found']);
+        $this->respond(200, $this->subscription(['user_id' => '01JSOMEONEELSE']));
+        $this->respond(200, $this->subscription());
+
+        $subscriptions = $this->owner()->appSubscriptions();
+
+        $this->assertNull($subscriptions->find('01JUNKNOWN'));
+        $this->assertNull($subscriptions->find('01JSUB'));
+        $this->assertSame('01JSUB', $subscriptions->find('01JSUB')->id);
+    }
+
+    public function test_all_follows_pages_and_filters_by_user(): void
+    {
+        $this->respond(200, ['data' => [['id' => 'a', 'user_id' => '01JUSER']], 'meta' => ['current_page' => 1, 'last_page' => 2, 'total' => 2], 'links' => ['next' => null]]);
+        $this->respond(200, ['data' => [['id' => 'b', 'user_id' => '01JUSER']], 'meta' => ['current_page' => 2, 'last_page' => 2, 'total' => 2], 'links' => ['next' => null]]);
+
+        $all = $this->owner()->appSubscriptions()->all(['group' => 'team-1', 'active' => true]);
+
+        $this->assertSame(['a', 'b'], array_map(fn ($s) => $s->id, $all));
+        parse_str($this->sent[0]['request']->getUri()->getQuery(), $query);
+        $this->assertSame(['group' => 'team-1', 'active' => '1', 'user_id' => '01JUSER', 'per_page' => '100', 'page' => '1'], $query);
+    }
+
+    public function test_a_rejected_app_token_is_renewed_once(): void
+    {
+        $this->respond(401, ['message' => 'Unauthenticated.']);
+        $this->respond(200, ['data' => [], 'meta' => ['last_page' => 1], 'links' => ['next' => null]]);
+
+        $this->assertSame([], $this->owner()->appSubscriptions()->all());
+
+        $this->assertSame('Bearer app-token', $this->sent[0]['request']->getHeaderLine('Authorization'));
+        $this->assertSame('Bearer fresh-app-token', $this->sent[1]['request']->getHeaderLine('Authorization'));
+    }
+
+    public function test_an_unreachable_service_is_a_temporary_api_exception(): void
+    {
+        $this->http->append(new ConnectException('Connection refused', new Request('GET', 'v1/client/subscriptions')));
+
+        try {
+            $this->owner()->appSubscriptions()->all();
+            $this->fail('Expected an ApiException.');
+        } catch (ApiException $e) {
+            $this->assertSame(0, $e->status);
+            $this->assertTrue($e->isTemporary());
+        }
+    }
+
+    public function test_the_shared_client_keeps_the_users_token(): void
+    {
+        $this->respond(200, ['data' => [], 'meta' => ['last_page' => 1], 'links' => ['next' => null]]);
+        app(AnikeenId::class)->withToken('user-token');
+
+        $this->owner()->appSubscriptions()->all();
+
+        $this->assertSame('user-token', app(AnikeenId::class)->getToken());
+    }
+
+    public function test_the_user_id_field_is_configurable(): void
+    {
+        AnikeenId::useUserIdField('id_service_user');
+        $owner = $this->owner(null);
+        $owner->id_service_user = '01JOTHER';
+
+        try {
+            $this->assertSame('01JOTHER', $owner->appSubscriptions()->userId());
+        } finally {
+            AnikeenId::useUserIdField('anikeen_id');
+        }
+    }
+
+    public function test_a_subscription_starts_with_a_free_trial(): void
+    {
+        $this->respond(201, $this->subscription());
+        $this->respond(200, $this->subscription(['active' => true, 'autorenew' => true, 'status' => 'trial', 'starts_at' => '2026-11-04T10:00:00+00:00', 'trial_ends_at' => date(DATE_ATOM, time() + 14 * 86400)]));
+
+        $subscription = $this->owner()->appSubscriptions()->create(['group' => 'team-1', 'name' => 'Pro', 'unit' => 'month', 'price' => '9.99', 'trial_days' => 14, 'trial_once' => true]);
+        $subscription->checkout();
+
+        $this->assertSame(['group' => 'team-1', 'name' => 'Pro', 'unit' => 'month', 'price' => '9.99', 'trial_days' => 14, 'trial_once' => true, 'user_id' => '01JUSER'], $this->sentJson(0));
+        $this->assertTrue($subscription->isTrial());
+        $this->assertTrue($subscription->isActive());
+    }
+
+    public function test_a_trial_can_be_confirmed_without_a_payment_method_and_end_cancelled(): void
+    {
+        $this->respond(201, $this->subscription(['trial_days' => 14, 'trial_payment_method' => 'optional']));
+        $this->respond(200, $this->subscription(['active' => false, 'cancelled' => true, 'status' => 'cancelled', 'starts_at' => '2026-11-04T10:00:00+00:00', 'trial_ends_at' => '2026-11-18T10:00:00+00:00', 'cancels_at' => '2026-11-18T10:00:00+00:00', 'trial_payment_method' => 'optional', 'cancellation_reason' => 'trial_ended_without_payment_method']));
+
+        $subscription = $this->owner()->appSubscriptions()->create(['name' => 'Pro', 'unit' => 'month', 'price' => '9.99', 'trial_days' => 14, 'trial_payment_method' => TrialPaymentMethod::OPTIONAL]);
+
+        $this->assertSame('optional', $this->sentJson(0)['trial_payment_method']);
+        $this->assertSame(TrialPaymentMethod::OPTIONAL, $subscription->trial_payment_method);
+
+        $ended = $this->owner()->appSubscriptions()->find('01JSUB');
+        $this->assertTrue($ended->isCancelled());
+        $this->assertSame(CancellationReason::TRIAL_ENDED_WITHOUT_PAYMENT_METHOD, $ended->cancellation_reason);
+    }
+
+    public function test_a_used_trial_is_refused_on_checkout(): void
+    {
+        $this->respond(201, $this->subscription());
+        $this->respond(409, ['message' => 'The user already had a free trial.', 'error' => 'trial_already_used']);
+
+        $subscription = $this->owner()->appSubscriptions()->create(['name' => 'Pro', 'unit' => 'month', 'price' => '9.99', 'trial_ends_at' => '2026-12-01T00:00:00+01:00', 'trial_once' => true]);
+
+        try {
+            $subscription->checkout();
+            $this->fail('Expected an ApiException.');
+        } catch (ApiException $e) {
+            $this->assertTrue($e->isConflict());
+            $this->assertSame('trial_already_used', $e->error);
+        }
+    }
+
+    public function test_a_subscription_is_created_with_a_discount(): void
+    {
+        $discount = ['label' => 'SUMMER20', 'percent_off' => 20, 'duration' => 'repeating', 'duration_in_periods' => 3];
+        $this->respond(201, $this->subscription(['discount' => [...$discount, 'amount_off' => null, 'periods_remaining' => 3]]));
+
+        $subscription = $this->owner()->appSubscriptions()->create(['name' => 'Pro', 'unit' => 'month', 'price' => '9.99', 'discount' => $discount]);
+
+        $this->assertSame($discount, $this->sentJson(0)['discount']);
+        $this->assertSame('SUMMER20', $subscription->discount->label);
+        $this->assertSame(3, $subscription->discount->periods_remaining);
+    }
+
+    public function test_a_running_subscription_is_changed_now_or_at_the_period_end(): void
+    {
+        $change = ['applies_at' => '2026-12-01T00:00:00+00:00', 'name' => 'Pro', 'description' => null, 'unit' => 'month', 'price' => 14.99, 'discount' => null, 'created_at' => '2026-11-04T10:00:00+00:00'];
+        $this->respond(200, $this->subscription(['active' => true, 'price' => 14.99]));
+        $this->respond(200, $this->subscription(['active' => true, 'price' => 14.99, 'scheduled_change' => $change]));
+        $this->respond(200, $this->subscription(['active' => true, 'price' => 14.99, 'scheduled_change' => null]));
+
+        $subscription = new AppSubscription((object) $this->subscription(['active' => true])['data']);
+
+        $this->assertSame(14.99, $subscription->change(['apply' => AppSubscription::APPLY_NOW, 'price' => '14.99', 'discount' => null])->price);
+        $this->assertSame('2026-12-01T00:00:00+00:00', $subscription->change(['apply' => AppSubscription::APPLY_PERIOD_END, 'unit' => 'month', 'name' => 'Pro'])->scheduled_change->applies_at);
+        $this->assertNull($subscription->cancelScheduledChange()->scheduled_change);
+
+        $this->assertSame([
+            'PUT /api/v1/client/subscriptions/01JSUB/change Bearer app-token',
+            'PUT /api/v1/client/subscriptions/01JSUB/change Bearer app-token',
+            'DELETE /api/v1/client/subscriptions/01JSUB/change Bearer app-token',
+        ], array_map(fn ($entry) => $entry['request']->getMethod() . ' ' . $entry['request']->getUri()->getPath() . ' ' . $entry['request']->getHeaderLine('Authorization'), $this->sent));
+        $this->assertSame(['apply' => 'now', 'price' => '14.99', 'discount' => null], $this->sentJson(0));
+        $this->assertSame(['apply' => 'period_end', 'unit' => 'month', 'name' => 'Pro'], $this->sentJson(1));
+    }
+
+    public function test_a_refused_change_carries_its_error_code(): void
+    {
+        $this->respond(409, ['message' => 'The credit would exceed the open bill.', 'error' => 'credit_exceeds_bill']);
+
+        $subscription = new AppSubscription((object) $this->subscription(['active' => true])['data']);
+
+        try {
+            $subscription->change(['apply' => AppSubscription::APPLY_NOW, 'price' => '1.99']);
+            $this->fail('Expected an ApiException.');
+        } catch (ApiException $e) {
+            $this->assertTrue($e->isConflict());
+            $this->assertSame('credit_exceeds_bill', $e->error);
+        }
+    }
+
+    public function test_a_missing_user_id_is_reported(): void
+    {
+        $this->expectException(InvalidArgumentException::class);
+
+        $this->owner(null)->appSubscriptions()->create(['name' => 'Server', 'unit' => 'hour', 'price' => 1]);
+    }
+}

tests/Id/BillableModelTest.php

@@ -0,0 +1,31 @@
+<?php
+
+namespace Anikeen\Id\Tests;
+
+use Anikeen\Id\Billable;
+use Illuminate\Database\Eloquent\Model;
+
+class BillableModelTest extends TestCase
+{
+    public function test_cached_api_results_are_not_model_attributes(): void
+    {
+        $user = new class extends Model {
+            use Billable;
+
+            protected $guarded = [];
+
+            public function cacheAll(): void
+            {
+                foreach (['addresses', 'countries', 'defaultPaymentMethod', 'invoices', 'orders', 'paymentMethods', 'subscriptions', 'transactions', 'userData'] as $name) {
+                    $this->{$name.'Cache'} = 'cached';
+                }
+            }
+        };
+        $user->email = 'ada@example.com';
+
+        $user->cacheAll();
+
+        // save() would otherwise write them as columns ("no such column: ordersCache")
+        $this->assertSame(['email' => 'ada@example.com'], $user->getAttributes());
+    }
+}