I am making a in-app-purchase app using the package flutter_inapp_purchase. I have some confusions and issues :

1. I want to make login based app using email/username and password, and playstore track the purchase status of app using the email used in playstore login. Now how can i track each user’s purchase status instead of gmail used in google play store login.

2. How can i verify purchase from backend using node? What should i pass to the backend from purchase result?

3. recently I faced a new issue in which, firstly i was logged in with [email protected] in playstore and I purchased a plan ‘A’ in app. Then i switched to [email protected] in playstore and again try to purchase same plan ‘A’ from app But purchase status showing as already purchased although i haven’t purchase any plan using this email in playstore