With the recent changes we've stopped receiving App Store Server Notifications V1 and we can only receive the V2 Notifications.
Does anyone know how to solve this?
Not receiving App Store Server Notifications V1 on Sandbox
After many tests we dicovered that if the production URL is different than the sandbox URL, you must use V2 notifications. If both of the URLs are equal, then you can choose to use V1 instead.
We were not able to find such rule in the documentation and the App Store Connect interface allows this behaviour as a working scenario, which is not.
I believe this should be on the documentation and the interface should raise an error when trying to use V1 notification with differents URLs.
Recommended
Thank you for your feedback, we have resolved this issue and you should expect to receive v1 or v2 notification to your sandbox endpoint even if the URLs are different.