Apple In-App Purchase sandbox environment can receive App Store Server Notifications v2, but the production environment is not receiving any notifications. I have verified that the configured URL is correct and it appears that Apple is not pushing messages in the production environment. Is there anyone who knows how to troubleshoot this issue
To troubleshoot, call the Get Notification History endpoint, targeting the production URL. If the response contains notifications, then they are being sent to your server.
https://developer.apple.com/documentation/appstoreserverapi/post-v1-notifications-history
If you do get notifications back in the response, check the sendAttemptResult field to better understand what happened when the App Store server sent the notification to your server. It's possible your server is returning an error, and this should help you troubleshoot. https://developer.apple.com/documentation/appstoreserverapi/sendattemptresult