There are several supported apps, such as Curve Pay, PayPal, and banking apps that have their own tap-to-pay implementation.
https://shkspr.mobi/blog/2025/06/contactless-payments-with-grapheneos/
https://grapheneos.social/@GrapheneOS/115295538501760765
You can also use the contactless payments supported
tag when searching the GrapheneOS banking app compatibility list on GitHub. https://github.com/PrivSec-dev/banking-apps-compat-report/issues?q=is%3Aissue+label%3A%22contactless+payments+supported%22
Thanks for reminding me!
I actually wasn't testing anything, I just needing to make a post using my Lemmy.world account, so I could appoint it as moderator (my main account is on lemmy.dbzer0.com). This community actually wasn't created by me. I had previously created a Bazzite community on dbzer0, but then Draconic_NEO created this community on LW and made me mod. I couldn't handle reports though, since they don't federate properly. I have hopefully sorted this out now, by creating an LW account for moderation only, which I now finally have appointed as moderator.