In case you want to add Zap support to your Lightning wallet, this is the shortest explanation of how it works:
(If you use another programming language or if your wallet is unhosted, you can still look at our code and should be able to understand everything it's doing. Ruby is very easy to read.)
Here's the gist:
1. Someone requests a Lightning invoice via your Lightning address. The requests contains extra Nostr/Zap information: https://gitea.kosmos.org/kosmos/akkounts/src/branch/master/app/controllers/lnurlpay_controller.rb#L133-L160
2. When that invoice is paid, a Zap receipt is published, so people on Nostr can see the zap: https://gitea.kosmos.org/kosmos/akkounts/src/branch/master/app/controllers/webhooks_controller.rb#L10-L19
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