Hi, I was reading this topic on Android Developer, exist some solution to secure my app? , ill not use google play, have my own server for registration and download the apk. Is intended for a closed market
Need validate the apk, revoke a license if the customer no pay and so on
I was read this about Attestation Api but its playstore related
The idea is to validate the user, example cell phone number, gmail, imei etc, so that every so often if someone does not pay their license can be revoked, i use sqlite with tables locally with the possibility of exporting to csv, in the future i will use a mysql server so that the user can access from his pc.