So contactless is still broken and that is because it is signed by a certificate granted by Google GOS does not have this cert so contactless is. Broken Unless your bank has thier own implementation then it may work. Also if the app your using comes from the play store you must have sandboxdd play services installed or. Yes you are correct notifications will be broken as it relies on play services for them to work but if you use play services sandboxed everything should work minus any app that enforces play services integrity check..