Why my server can not recieve any server-to-server notifications about in-app purchase

I have confige the server url in my apple,but when tested the function in the sandbox environment , i didn't receive any notifications about the purchase, how can i find the problem?

Replies

How many fails? I believe Apple stops sending notifications after 5...


As well, is that app 'in review'?


Is this just for auto renewals?


Seen Rich's reply in this previous thread?


https://forums.developer.apple.com/thread/83519