I am experimenting Webhooks integration for purchases events callbacks in Sandbox environment in AppStore. For every purchase transaction I do, I see that there is an attempt to trigger the Webhook in the Event Details, but I only see Retrying and Failure states. I do not see any logs about attempting the endpoint for any event at the API service level.
In case of Failure, the response does not have any detail to convey the reason for failure.
I have tested the endpoint separately using other clients and see that the endpoint is up and running and returns 200 status code. Not sure what is the issue here and where can I find more information to debug this situation.
Any help is greatly appreciated.