Zap splits example:

50% for you and 50 for vitor

Zap tag, hex, relay and percentage

["zap","1bc70a0148b3f316da33fe3c89f23e3e71ac4ff998027ec712b905cd24f6a411","wss://relay.damus.io","0.5"],

["zap","460c25e682fda7832b52d1f22d3d22b3176d972f60dcdc3212ed8c92ef85065c","wss://vitor.nostr1.com/","0.5"]

Heres is the nip too

https://github.com/nostr-protocol/nips/blob/master/57.md#L172-L183