get https://www.keycafe.com/v0/access/qrCode/
Retrieve a QR code that guests can scan instead of entering their booking code on capable SmartBoxes.
Returns a QR code in PNG format if request is valid.
The QR code is an encoding of the access bookingCode , which can be used by guests on MS5 SmartBoxes instead of typing the code manually. MS5 SmartBoxes are able to scan and use QR codes of any code that would normally be entered manually on the keypad, not just the access booking codes.