docs: fix to OAS generator following Zod update + generate API reference (#13030)

www/apps/api-reference/specs/admin/paths/admin_payment-collections.yaml

@@ -30,20 +30,7 @@ post:
     content:
       application/json:
         schema:
-          type: object
-          description: The payment collection's details.
-          required:
-            - order_id
-            - amount
-          properties:
-            order_id:
-              type: string
-              title: order_id
-              description: The ID of the associated order.
-            amount:
-              type: number
-              title: amount
-              description: The amount to be paid.
+          $ref: ../components/schemas/AdminCreatePaymentCollection.yaml
   x-codeSamples:
     - lang: JavaScript
       label: JS SDK