Yes, that's how shopping should be. You pull out a QR code on your smartphone, use it to enter the store through the gate, pick up what you want, and walk out. That's it. When you take what you want from the shelf, it goes into your virtual shopping cart on your smartphone. If you change your mind, you can just put it back on the shelf and your cart will be gone.
Further display This is the shopping experience that should be like! ~ Shopping completed without waiting in line at the register. Go! Amazon Go!