Yep. Check out this line in the nip 57 spec:
https://github.com/nostr-protocol/nips/blob/fa9281af8b7c964542dd1145ba61a9fd851af713/57.md?plain=1#L22
" publish it to the `relays` specified in the `zap request`."
... almost everyone gets this wrong the first time they create a zap receipt server... ...