https://privsec.dev/posts/android/banking-applications-compa...
Google Wallet is not supported at all.
It's probably a pipe dream but I do hope that someone like Motorola officially supporting GrapheneOS will make businesses take support somewhat seriously. If nothing else you sound less like a crazy person when you tell your bank's customer support "I bought a Motorola phone and now your app doesn't work" than "I flashed a custom ROM to my Pixel and now your app doesn't work".
If they don't support it -> notify them and change bank. Enough people doing this, something will change.
Certification authentication is neat technology in principle, I use it internally, but in my experience anyone who recognizes it also hates it passionately. It's the thing that seemingly stops working every time their taxes are due, courtesy of terrible government software.
If I started telling people that they should be demanding certificate authentication from their banks, they'd probably think that I escaped an asylum.
https://privsec.dev/posts/android/banking-applications-compa... has a UK section.