I think under the hood, a 3rd party app just monitors nostr events for reactions of a specific type. For example when you tap 🤙 on Damus, Zapplepay will notice that you did that and send sats to the owner of the note you reacted to on your behalf.
quotingHere's a guide to setup zapplepay and get your Damus zaps back.
note1axf…ks6v
https://yeghro.site/2023/07/07/apple-got-zappled/
