I am experiencing the same issue on a flutter app. Until lastnight, sandbox subscriptions and apple store server notifications to sandbox server url were working fine. Although nothing changed on flutter's side, sandbox subscriptions are started to getting marked as "Your payment method was declined" at first renew time. In addition, apple store server notifications are not being sent for any subscriptions. I requested a test notification to my sandbox url and test notification is working fine: https://developer.apple.com/documentation/appstoreserverapi/request-a-test-notification Tried multiple sandbox accounts, different account regions, yet the result is same. If it helps to identify the issue, I realized transactionId of failing transactions always start with 100..., yet it was always 200... up until the issue is emerged. Verified StoreKit2 is used on app and there has been no code change. Thanks in advance for any insight or help.

I can confirm im having the same issue. Auto renewable subscriptions are marked as "Your payment method was declined" and i dont receive any apple server notification to my sandbox url for initial purchase and upcoming events. Test notifications are working fine for the sandbox url. When i check notification history, last notifications are from evening of November 3th (UTC). Currently, i can only verify initial subscription receipt in my backend but notifications are not sent on sandbox environment. There has not been any change on application side. Thanks in advance for any help or insight.