Re:Encoding your WiFi access point password into a QR code
by naniwaduni on Sunday December 29, 2019 @05:21PM
(#21908993)
See, one of the useful properties of a paper receipt is that, once you receive it, you can be fairly confident about the ~one way you're going to lose it
When the QR code is scanned, the browser opens to the URL, the remote side takes your "receipt ID", and presents you with a list of all the items you purchased.
I can't imagine any decent-sized retailer isn't already maintaining records like this.