Dear App Store Engineering Team,
I am writing to request official confirmation regarding the behavior of App Store Server Notifications when migrating a live application from V1 to V2.
Context: Our application has been live since 2008 and currently utilizes App Store Server Notifications V1. We have a large database of existing legacy subscribers. We are preparing to switch our Production environment setting in App Store Connect from "Version 1" to "Version 2".
Our Questions: When we change the setting in App Store Connect to Version 2:
Global Format Switch: Does this setting apply immediately to ALL notifications, including those triggered by subscriptions that originated years ago (legacy users)?
Payload Consistency: Will renewals for existing legacy subscriptions continue to arrive in the JSON V1 format, or will they immediately start arriving in the V2 JWS (signedPayload) format?
Our expectation is that the switch is global and all future notifications (regardless of subscription age) will be sent as V2 JWS payloads, but we require official confirmation to ensure our backend handles the migration without service interruption.
Thank you for your assistance.
