I’m sitting in a bar at the airport, waiting for my plane to board. The lady brings me my beer and when I see the QR code in the ticket, for a second I imagine a time when we’ll be able to scan that code with our iphone and have the payment automagically done 🙂
My Map of things 
for when is bad syntax, its better how soon
By when?
It works already that way in Belgium with the Bancontact app (https://www.bancontact.com/en/bancontact-app) in many supermarkets. You can also refund friends as the app generates a QR code to be scanned by the other smartphone.
Interesting.. 🙂 Thanks Yann!