feat: Update swagger to openapi 3.0.4, update request payloads with examples (#11374)

swagger/definitions/request/webhooks/create_update_payload.yml

@@ -3,16 +3,23 @@ properties:
   url:
     type: string
     description: The url where the events should be sent
+    example: https://example.com/webhook
   subscriptions:
     type: array
     items:
       type: string
-      enum: [
-        "conversation_created",
-        "conversation_status_changed",
-        "conversation_updated",
-        "message_created",
-        "message_updated",
-        "webwidget_triggered"
-      ]
+      enum:
+        [
+          'conversation_created',
+          'conversation_status_changed',
+          'conversation_updated',
+          'message_created',
+          'message_updated',
+          'contact_created',
+          'contact_updated',
+          'webwidget_triggered',
+        ]
     description: The events you want to subscribe to.
+    example:
+      - conversation_created
+      - conversation_status_changed