Maybe as a ticket entry system? Bar with a cover charge puts a QR code on the front door. QR code leads you to a paid link, you pay for access, it shows a thum

Maybe as a ticket entry system? Bar with a cover charge puts a QR code on the front door. QR code leads you to a paid link, you pay for access, it shows a thumbs up, you show the bouncer, they let you in. Let's the venue track how many people showed up, doesn't require a whole account situation, and also reduces the need for people to deal with card processing or cash at the door. Also let's you come and go without a wristband or stamp or something else to verify you already paid. Trivial to change the URL each day so you can't use a previous day. Or let it ride for weekend access, etc Not sure if better solutions already exist though