Quiz game Android App features Upgrade code in Kotlin

I am looking to upgrade my quiz game Android application with new features coded in Kotlin. This app, currently coded in Kotlin, is a game and will feature an upgraded version which includes in-app purchases. The upgrade code for this project will be written in Kotlin. All requirements Attached. App connects to a admin panel backend via API's . Name of the app - WInzy (www.winzy.in) - you can check the current version of app by downloading the android app from the website.