this post was submitted on 15 Mar 2025
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Just as they do know: The till will tell them that the customer has paid.
Which is why I said that this QR code thing is much more useful for situations where there's no till in the first place, like a flea market, where a QR code + looking at the transaction log on your phone can make a shoddy yet serviceable till. Certainly better than telling people to go to an ATM if they want to buy something.