I have an app made in android studio.
This app has a feature for the user to buy credits and make upgrades within the app.
I need a developer to create a new upgrade for me.
I want the registered user to have access only to the basic content of the app, and after he makes the payment he gets full access. It's important that the user makes the payment every month so that he maintains full access to the app.
And you also need a new feature to link or remove this new upgrade from any user's account.