greenart7c3 on Nostr: https://github.com/nostr-protocol/nips/pull/1812 Garnet and mostard use this, but ...

https://github.com/nostr-protocol/nips/pull/1812

Garnet and mostard use this, but they only allow adding and removing the monero field.
Using this you could add any form of payment you want and clients could list it on your profile