In the session on StoreKit 2 (which looks amazing!), the presenter says:
In fact, if your app is running when a purchase is made on another device, you'll be notified about the new transaction.
This seems to mean that when an app uses the listener API to be notified of transactions, it will get transactions that happened on other devices.
My app offers purchases across other platforms in addition to iOS, and when a purchase happens we register it with our own account system. If a user has the app running on both their iPad and iPhone and makes a purchase on the phone, if the iPad gets notified of it the same way it would of a purchase made on the iPad, both devices will try to report it to our system. This seems undesirable.
What's the recommended approach here? Should we just make sure our system will disregard duplicate transaction reports? Or is there a way to know whether a transaction originated on this device? I don't see a property on the transaction type that looks like it could accomplish this. Maybe the deviceVerification properties? But that's seems more like the new edition of transaction receipt verification - failing that check would presumably mean that the purchase is invalid, not that it didn't happen on this device...?
