Coinos.io has a qr code you can use. Hit recieve > more options > bolt12. You can copy that qr and print it or whatever. People can scan that qr and pay you.

Normally lightning network (zaps like on nostr) works on an invoice system (you have to create a new invoice for each transaction). Bolt12 works sort of like a tip jar and can be reused.

Someone correct me if I'm wrong here.

Welcome to nostr,

Where shoes are on heads

And zaps in our wallets

Shit gets nerdy and weird here sometimes (often). Hope you have fun and stick around!