In my city you can pay for parking using an app or you can still go to a physical kiosk to pay by entering your plate number. I use the app because it's pretty easy and convenient. You just have to get the parking area code from a sign that's next to the kiosk. A couple of clicks and you're done. If you need to add extra time, you don't have to go back to your car, you can extend your time in the app. The extra 20 cents they charge in the app isn't going to make or break me.