I have been using GrapheneOS for a few months in Spain with and out of three banking apps only one gave me trouble, I had to enable "Exploit Protection Compatibility Mode" on "app information". Personally I refuse to pay with the phone so I am okay not having that option.
If someone wants to try Graphene os maybe that option will work on their banks too.
If someone wants to try Graphene os maybe that option will work on their banks too.