I have a custom build. Running my own btcpay instance on my node for backend, and Vercel website for front end
Discussion
I believe there is a nostr:npub15dc33fyg3cpd9r58vlqge2hh8dy6hkkrjxkhluv2xpyfreqkmsesesyv6e plugin for nostr:npub155m2k8ml8sqn8w4dhh689vdv0t2twa8dgvkpnzfggxf4wfughjsq2cdcvg - not had a play with it yet though.