How about posting an LNURL with variable payment amounts and uses?
How about using zap tags to let the client render the payment request?
npub1kz…2p65n
2026-07-24 22:59:50 UTC
in reply to nevent1q…dy5v
Author Public Key
npub1kzkrmkvgq4ppwj0j5pdr0vj5mgpmtcapc6sjuw3wajvg40ryrwrsu2p65nSeen on
wss://nostr.mom