What app is this? At BigC this morning they had girls holding big QR codes, but how is it used? Do you have to install an app? I didn't see them scanning a phone QR code, which would have made more sense. I don't carry a phone, so they said to sign-in. Is someone going to type the illegible scrawlings into a database? They already know when you are there from the BigC card, assuming you buy something.