we have a FireTV app (com.company.product) where you can buy our product via IAP (subscription).
The question is, could I make a "Login with amazon" on any other platform (Android/iOS mobile app e.g.), which retrieves the information if a users has purchased our product on com.company.product on the FireTV?
Basically a cross-platform subscription check:
1. User logs in via Amazon-login from any platform (web, mobile)
2. We retrieve if this user has purchased com.company.product
As far as I know you don't get the "ReceiptId" for a logged in user and you need it to verify the subscription:
Note: We don't have an account system of our own.
Thanks for any help!