I am using zavo on ios, what's the prob? u don't need to select any app, just make sure you have funds in amazon wallet (wallet, not gc balance) and then just pay via zavo, and payment method select QR"Bhim QR", it will generate the QR, and use amazon app to scan/pay, simple. If you have both apps in same phone, make sure you use a diff phone to snap a pic of that QR coz if u upload from galary, it will limit you to 2k max trxn only.