My bank offers mobile payment via their own application (so no Google pay or any 3rd party provider is needed.)
My problem is that the banking application is not listed as an option for Default payment app in Settings->Connected devices->NFC->Contactless payments->Default payment app.
Mobile payment of course does not work. I've also tried to open the bank app before payment but that did not help either.
The contactless payment setup in the banking app went fine just like on the stock rom. The only difference I can see is that on the stock rom I can set my banking app as default payment app while I cannot do it on GrapheneOS.