Not a good analogy. The seller sees his own name and account number on the customers phone. Which means that the QR-code is read correctly and the money is in secured transit into his account.
There is only one situation when the system faults. And that is when the customers phone is destroyed before updating the server. But these are just virtual pennies for small everyday purchases.
There is only one situation when the system faults. And that is when the customers phone is destroyed before updating the server. But these are just virtual pennies for small everyday purchases.