I have created one Android Earning App and here the .aia file for your reference. It can be opened from thunkable. You can do some minor modification and make your customized earning app and share it in google play store.For any question please comment.
Apk File: https://drive.google.com/open?id=1U3-B9rOFZ8wmEq2RPC1_iu6GI0JKRHfd
Aia File: https://drive.google.com/open?id=1yCMmeqjOFP-5twdJpER5yHOfr3x39xHj