A QR code is a type of barcode that contains more data than a regular barcode and looks like this:
The QR code is used to identify which Participant location a transaction is occurring in. E.g Acme Mechanics at 123 Flood Street.
Note: The QR codes are scanned using the camera on the mobile device. So always make sure that the camera is functional on the device, and is unobstructed and clean.