It's safe to assume that 18 months a lot of people around the world had never heard of a QR code, let alone used one. Especially older members of the community, not as used to technology.
It is not hard to imagine that some people have had a bit of trouble getting their head around how QR codes work. Case in point, Australian radio DJ Jess Eva's mum.
The "I'm a Celebrity Get Me Out of Here" star and Triple M radio host shared on Instagram how her mum hadn't quite got the hang of how QR codes were supposed to be used.
"Sorry to sound dumb, but I'm not sure who to ask," the message from Jess' mum began.
"Who do I send all those photos of the QR codes to?