PayPal announced today that people in 20 cities can now pay for parking using the Parkmobile app via their PayPal accounts. The app is already in use by over 4 million people in 250 cities. Now PayPal can get in on that action. More cities will be rolling out.

“Once you’re set up with your PayPal account, you can now pay and park in one click, making it extremely fast and easy to park,” says Randall Davies, Head of Corporate Business Development, Americas at PayPal. “And, as always, when paying with PayPal you never have to worry about your financial information being shared or being stored in a place that may be vulnerable to hackers.”

“The way Parkmobile works is simple,” he adds. “Drivers look for the green Parkmobile sign on designated spaces and pull in. Then you use the Parkmobile app on your smartphone to activate your session and key in your parking zone number. Then you pay with your PayPal account. That’s it! No more pulled muscles from scouring your car’s floor for loose change.”

ParkMobile is available for iPhone, Android, Windows Phone and BlackBerry.