Is it the same as https://github.com/SamSamskies/nostr-zap ?
I should be able to add a button to each app so people can get zapped from app preview
Discussion
"Make it easier for clients to discover the right app(s) to handle a specific event kind" https://github.com/nostr-protocol/nips/pull/530
Oh I must have been looking at something else.
I have no idea how to implement that 🤷♂️