Hi,
My iOS app allows a user to perform a rather expensive cloud operation (costs me 10 cents per time) and I want to ensure they can only do it once a day across all of their iOS devices. The marketing will make it clear this is how it will work so users won't be surprised. While most will only have one iPhone in practice, with my subscription pricing I'd lose money the second someone started doing it on a second device.
I could solve this using Sign in with Apple to ensure there is a 1:1 correlation between Apple ID with paid subscription and a user account in my system that I could track usage against but I'd like to avoid users having to sign in at all since it would serve no purpose from a user perspective.
identifierForVendor won't work since it's different across every device the same user has
Is there something in StoreKit v2 receipts or transaction data that would be stable longterm and have the same result across all devices using the same Apple ID? I don't actually want any info about the user, just a stable anonymized identifier to see they are the same user on different devices.
I could also go with a consumable in-app purchase but I don't think users would like this pricing model for this app.
Thanks!
Colin
