Bring the package up to date with the Anikeen ID API

Fixed (called endpoints that don't exist):
- charge(): POST v1/billing/charge (Stripe options aren't passed through anymore)
- Invoice::getInvoiceTemporaryUrl(): GET instead of a non-existent PUT
- OrderItems::create(): POST v1/orders/{order}/items
- createUser() / isEmailExisting(): admin endpoints with the app token
- sshKeysByUserId(): app endpoint; no longer returns the first user's keys for every user
- createOrderPreview(): country_iso goes into billing_address as the API expects
- public endpoints (products, order preview) work without a token
- SshKeys::find() results can be deleted

Added:
- Billable: sshKeys() (create, update, delete), billingOverview(), PaymentMethod::delete()
- AnikeenId: products(), boxes(), shipping labels (list, show, pdf, issue, ship, price list),
  createOrderForUser(), createTransactionForUser(), findOrCreateSocialiteUser()

Requirements: PHP 8.2+, Laravel 11-13 (Laravel 10 and PHP 8.1 are end of life).
Docs generator handles union types; README regenerated.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/Id/Concerns/ManagesBalance.php

@@ -30,21 +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 Throwable
      */
-    public function charge(float $amount, string $paymentMethodId, array $options = []): Transaction
+    public function billingOverview(): object
+    {
+        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', 'billing/charge', [
+            ->request('POST', 'v1/billing/charge', [
                 'amount' => $amount,
                 'payment_method_id' => $paymentMethodId,
-                'options' => $options,
             ])))
             ->setBillable($this);
     }
-}
+}␍