I use nostr:npub1cwneqlnjgs3rdtk97c2ffy2df9dm5zycgj3dsg8c3z00hchxjmfqtvraju to accept fiat via Square/CashApp, BTC onchain to my xpub, or Lightning to my node (easily swappable to Strike for convenience)
I don’t know if they have a great in-person POS solution but I’m liking it a lot for what I use it for.