Integrating In-App Purchase On Buttons (Kotlin)

1. User Interface is ready at my android studio application.
2. About 11 buttons need to be integrated with google play billing library.
3. So 11 buttons to 11 product id on google developer console (product id is ready).
4. Each product need to be able to purchased repeatedly (consumable / auto consume right after purchase).
5. Send email with purchased token, order id / order number and user email, right after product successfully purchased.