Google Pay is not available on any alternative OS due to Google blocking it. It's unfortunately their choice, rather than a lack of support on our end.

Depending on where you are in the world, there might be other NFC payment options for you.

In the EEA and UK, Curve pay works. Paypal made their own solution and is rolling it out, starting with Germany. Both work with GrapheneOS. Many banks also have their own solutions.