Modern parking lots always seem ripe for physical phishing, whats stopping someone from sticking up a couple of QR codes that link to a fraudulent payment page or some other malware? This is one of those things that tech really didn't "fix" and now I have to select from one of 20 apps instead of just paying with cash or even a credit card.
I have, on multiple occasions (in Austin, >10 years ago), paid for parking to an "attendant" at a lot I know is free. Those guys will just have your car towed — the whole scam just hangs together: the towing company charges you for the storage & processing, but not the nominal fee; the attendant gets cash. Win-win-lose.
It was only a couple of pounds or so. I haven't been to these parts of town for years so I have no idea if this practice still goes on.