I'm actually only somewhat familiar, but essentially make it super duper easy to integrate with; QuickBooks and Xero and pay attention to be compatible/comparable with Stripe, Square, Zoho (in the US)...
Thanks for pointing me in the proper direction. Currently Hisa is an android marketplace for Nostr protocol. the idea is to have merchants perform in-person checkout. Accepting BTC simply by their lightning ⚡ or configured addresses and payment options
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