Hi,
I'm using Sparkasse Mobiles Bezahlen in a separate profile with play services installed. This works very well, but you need to switch profiles.
Without play services the app itself can be started, but you can't add any cards to it. I once got it working by adding play services, then adding cards and removing play services again. The payment itself was then working without play services. But wasn't always stable (at least that's how I remember it).