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I don't believe uber gives the restaurants a receipt printer. They just have a tablet to confirm orders as far as I can tell.

• jhugo 4y ago
  If they already have one, most are compatible with various kinds of barcode. But perhaps there is an integration problem there. The QR approach I described is how it's usually done here in Asia, and it works well. (I've never had a swapped order, nor heard of it being an issue. Volume is likely considerably higher, too.)
  • Slartie 4y ago
    I work in POS systems, and thus know various kinds of receipt printers rather intimately. It is surprising how much variation the command sets have when it comes to printing barcodes, and especially for more complex ones like QR codes. Older ones don't even support them, you have to resort to software-rendering and printing images instead. And the image-printing commands are just as messy. It would probably be easier to add some kind of OCR functionality into the app to automatically read and parse some kind of textual order ID from a receipt than to ensure that QR code printing works fine on 30 different POS printers from 20 different manufacturers, of which some are over 10 years old. Though a combination would probably be best: print QR codes whenever possible, prefer them when scanning, but when no code is found, try to OCR the receipt and find a textual ID.
    • ilyt 4y ago
      I'd think simple standard 1D barcode would be enough; it's just few letters, no need for QRcode and far more compatible with random label printer