A website I made for selling tickets to my bitcoin script workshop
I use NWC to generate lightning invoices from my coinos account and upload the ones whose payment hashes are paid to a nostr relay. Then I treat the payment hashes as the tickets. Users present them at the workshop, I ensure they were uploaded to nostr, thus confirming they were paid, and that "proves" (to my satisfaction, anyway) that the user is allowed to enter the venue.