The place for you to start is this step in NIP-57 ..https://github.com/nostr-protocol/nips/blob/3e8c33ee79e3d2eb46ca498eddadcc6ef1ef7329/57.md?plain=1#L19 .. anyway you can test it with the LONG & FAILING url I provided previously....
Testing zaps for this note… we made six attempts to⚡zap this note, at pedromvpg@btcpay989117.lndyn.com, over a period of 19 minutes. In each case, we found that your lightning address server did not respond correctly. (The failure point was when we did a GET request to your specified callback URL: https://btcpay989117.lndyn.com/BTC/UILNURL/pay/lnaddress/pedromvpg.) Your server did not produce an invoice, thus the zap failed. We recommend that you use a cloud-based Lightning node which is optimized for Nostr zaps, to get your zaps working.
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