Pay securely with an Android smartphone, completely without Google services: This is the plan being developed by the newly founded industry consortium led by the German Volla Systeme GmbH. It is an open-source alternative to Google Play Integrity. This proprietary interface decides on Android smartphones with Google Play services whether banking, government, or wallet apps are allowed to run on a smartphone.


Then why doesn’t GrapheneOS offer that alternative to banks etc
Because you can’t unilaterally just save credit card information and use it for payments. Your bank has to support and approve the app/service.