We walked in and had paper tickets in our hands. We were ushered over to an area that said "online voucher redemption" or something. Someone scanned our paper printout and swapped it for a ticket. At that same booth there were two computers set up. I'm not certain but it LOOKED like it was the website where you could plug in the PIN and code you get when buying a ticket online and print off your voucher.
I did not see anyone scanning a smart phone.