Google Pay is the only significant thing which does not work with GrapheneOS, but you can use a smartwatch.
Tested Garmin Pay so far, no problems.
ᴄᴜʀꜱᴇ ʏᴏᴜ ꜰᴏʀ ᴘᴜᴛᴛɪɴɢ ᴀɴᴏᴛʜᴇʀ ᴛʜɪɴɢ ᴏɴ ᴍʏ ꜱʜᴏᴘᴘɪɴɢ ʟɪꜱᴛ
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