fix(payment): PAYMENTS-11168 Update transaction created webhook order id to be string

Author: bc-afeng

docs/integrations/webhooks/events/index.mdx

@@ -607,7 +607,7 @@ Payload objects with the following scopes take the form that follows:
   "store_id": "1025646",
   "data": {
     "type": "transaction", // will always be transaction
-    "order_id": 250, // ID of the order associated with the transaction
+    "order_id": "250", // ID of the order associated with the transaction
     "transaction_id": "176342342", // ID of the transaction; created by the payment provider
     "transaction_status": "complete",
     "transaction_type": "capture",

docs/webhooks/callbacks/store_order_transaction_created.yml

@@ -18,7 +18,7 @@ properties:
         type: object
         properties:
           order_id:
-            type: integer
+            type: string
           transaction_id:
             type: string
           type: