TheGodfather If your app "forgets" your card this might be due to missing Play Store / framework. I personally don't have a Sparkasse account. But I know this behaviour from VR banks.
Jurij Do you know if Sparkasse's pay app needs Play Store / framework installed?
Aeon I used VR pay and both girocard and Mastercard worked fine.
Ralf401 I stopped using VR pay beeing conćerned about phone permission.