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Re:Encoding your WiFi access point password into a QR code by jlgaddis on Sunday December 29, 2019 @02:31PM (#21907908)
Seems like the obvious thing would be to have the QR code contain a "receipt ID" (UUID?) in a URL.

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.

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
Re:Encoding your WiFi access point password into a QR code by jmiserez on Monday December 30, 2019 @10:32AM (#21913951)
Two ways. Receipts fade, sometimes very quickly.