I have an app that works by being able to map IAP transactions to a predefined user ID. This means when I consume events from Apple's App Store Server Notifications endpoints I have to do a reverse lookup in order to assign permissions within my app.
Workflow:
- User purchases subscription within the app via IAP. The app persists the subscriptionID from the Apple IAP library in my cloud database (Firestore).
- Cloud function receives the event from App Store Server Notifications endpoint and looks up the user ID containing the persisted transactionID (with retries to avoid race condition).
Question:
This workflow works but it seems an improvement would be to allow dev's to append metadata, like the user ID, to the transaction submitted to IAP that we can access within the signedTransactionInfo of the event from the App Store Server Notifications endpoint in order to facilitate a direct lookup of the user document needing it's permissions updated. This would greatly simplify workflows that use non-Apple systems as a source of truth for app permissions. Does this actually exist already? If not, is there a feature request platform?