To allow customers to post a comment. To be printed on the receipt or issue a qr code qr code instead distributed to the print itself. Because of the ease of use of the smart phone.
Providing customers to comment should be printed in QR code receipt, or deal QR code instead of giving the address type. Because it is convenient to use. Smart phone.
The customer came in comments likely to print a qr code on the receipt, or distribution, qr code, instead of the distribution, printing, because ease of use through smart phone.