diff --git a/src/Id/Webhooks/EventType.php b/src/Id/Webhooks/EventType.php
index 06d5f21..70ee0cb 100644
--- a/src/Id/Webhooks/EventType.php
+++ b/src/Id/Webhooks/EventType.php
@@ -13,6 +13,12 @@ final class EventType
     public const ORDER_PAYMENT_FAILED = 'order.payment_failed';
     public const ORDER_CANCELLED = 'order.cancelled';
     public const ORDER_SHIPPED = 'order.shipped';
+    /**
+     * Money was given back for an order (a refund or a partial cancellation, with a credit note);
+     * see the order's `refunds` and `refunded_total`. A full refund also cancels the order
+     * (order.cancelled follows).
+     */
+    public const ORDER_REFUNDED = 'order.refunded';
 
     public const SUBSCRIPTION_CREATED = 'subscription.created';
     public const SUBSCRIPTION_ACTIVATED = 'subscription.activated';
diff --git a/tests/Id/WebhookTest.php b/tests/Id/WebhookTest.php
index d9e75b0..5061bb3 100644
--- a/tests/Id/WebhookTest.php
+++ b/tests/Id/WebhookTest.php
@@ -70,6 +70,12 @@ class WebhookTest extends TestCase
         $this->assertContains(EventType::SUBSCRIPTION_RENEWED, EventType::all());
     }
 
+    public function test_refunds_have_their_own_event_type(): void
+    {
+        $this->assertSame('order.refunded', EventType::ORDER_REFUNDED);
+        $this->assertContains(EventType::ORDER_REFUNDED, EventType::all());
+    }
+
     public function test_a_change_carries_the_previous_attributes(): void
     {
         $this->payload = json_encode(['id' => '01JEVT', 'type' => EventType::SUBSCRIPTION_UPDATED, 'created' => time(), 'data' => [