The QR code that you give to others to pay YOU is permanent.
But we are talking here about a QR code on your phone that allows others to DEBIT your account. That code changes quite rapidly. That's the context of this discussion: trying to send someone a QR code off your phone that allows them to use it to pay for something.
I thought we were talking about a QR code that the hotel in Hangzhou will provide
italdesign friend so she can pay. It's impossible to know for certain what type of QR code it will use, but I was guessing that it generates dynamic codes for each customer that are tied to their reservations. Maybe I'm being dense, but I don't understand how the code you are describing would function wrt this (prepaid hotel room) use case.