Settings > Connected devices > Connection preferences > NFC > Contactless payments
I generally prefer to use the physical card issued by my bank and not involve apps or third parties. However, here are some options for contactless payments that are reported to work.
https://discuss.grapheneos.org/d/443-gpay-alternatives-for-grapheneos
https://discuss.grapheneos.org/d/16670-private-space-on-android-15-grapheneos
GrapheneOS fully supports the Private Space feature in Android 15, which is essentially a separate user nested inside of the Owner user.
We strongly recommend it as a replacement for a work profile managed by a local profile admin app. It has better OS integration and isolation.