None of that would not help if scammer puts a sticker on top of all you just mentioned, that says: "To pay, scan this code with your camera app". It would only

None of that would not help if scammer puts a sticker on top of all you just mentioned, that says: "To pay, scan this code with your camera app". It would only deter people who already have the app since before, which is already the case, i assume most people just enter the Parking zone number by reading it from afar or using GPS from app, not by walking up to the machine and scan it.