Have a look at nostr:npub13ljnkd633c7maxatymv3y2fqq8vt3qk7j3tt0vytv90eztwgha9qmfcfhw too.. it’s better than Muun, and has a lot of integrated stuff like a point of sales and btcpayserver integration. Not familiar with square to know if it can play nicely with it
Discussion
That's interesting! I am going to look into it and see how well it works and if its available in the U.S. But they would more than likely swap immediately to fiat so I'm not so sure it would be optimal for them accounting wise. But Blink does look interesting.