when is the last time someone used a coin to pay for something that wasn't a coin operated machine. Just get rid of them, or make coins that are worth >= $1
Canceling refunds the extra amount to my balance. The app only charges the balance once a month.
You can't leave it for the next guy, because it's not a parking spot that's paid for. Instead, you pay to park a certain car in any spot in a larger parking zone.