Hello, I wanted to know if there is a way to know who purchase through the app-in purchase, without having to change the code of the developed app. Not statistical data but email: ex: example[at]example.coms buy in the app the product X
identify who buy a product in-app purchase without modify the app code
No.
are there other options?
Hello,
This isn't precisely what you're asking for, since you're asking for some way to not have to touch your application. However, there is appAccountToken as part of StoreKit 2, which you can see more documentation on here: https://developer.apple.com/documentation/storekit/product/purchaseoption/3749440-appaccounttoken.