[nayuki]

Toronto Parking Authority is guilty of this. If you pay at a terminal on the street, then you're charged the exact amount needed for your parking session. If you pay using the mobile app, then it charges your credit card in increments of $20, requires your mobile phone number as an account identifier, and keeps track of your remaining monetary balance.

[BolsunBacset]

The only saving grace here is that it goes to the municipality at least