We have implemented subscription status URL, and i am sure that it support ATS, we have use tool /usr/bin/nscurl to verify my url https://webhook.boomplaymusic.com/whs/ios/pushSubState, the result is PASS, but we check the server logs, our server did not received any notification of subsciption status, when we test subscription in the sandbox environment. Please help us to found the reason.
Thanks.