Why do you use QR codes for Yeokens? To give you a quicker, easier way to bank Yeokens. Simply open the camera on your smartphone and scan the QR code. Related articles How do I claim an offer? I'm not sure if my booking went through, how do I find out? How many different ways are there to spend your Yeokens? When does Yeokens finish? What happens if my QR code doesn't scan?