Smart enough to do it, dumb enough to do it also. It's more common than it seems like it ought to be.
Maybe the fake app can say "Now you need to go to walmart.com to buy a gift card and enter that gift card code's to pay for parking", but that would filter out a lot of people who was looking for convenience in the first place. If I were consulting for this criminal, I'd say "You need to get to their greed by offering them a big prize, e.g. 1 year free parking in $CITY...".
These scammers are either smart and done everything anonymously, or too stupid to understand how this can all be tracked, but unfortunately this stupidity does often end up paying off.