A zap request is just an event sent to a Lightning node, instead of a relay. If the node can handle those requests, it reads in the event and sends a zap receipt to the relays. The description tag of the receipt contains the original request, so that the receipt event is a sort of wrapper. I display the wrapped event in the feed, as if it were a kind 1 note.

GitHub

nips/57.md at master · nostr-protocol/nips

Nostr Implementation Possibilities. Contribute to nostr-protocol/nips development by creating an account on GitHub.