QR controlled pour at a movie theater

The customer pays at self checkout, their phone or the till and gets a QR code for each drink. At the dispenser they scan it, choose a drink and pour. The dispenser checks the code on its own, with no network, and only pours the cup size that was paid for.

Cepuder makes this work at the point of sale by generating the drink code on the customer's receipt or their phone.