This app was mentioned in 2 comments, with an average of 1.00 upvote
Or you can make it even easier than that and do it via your mobile:
Apple: https://itunes.apple.com/cz/app/sejf/id301404273?mt=8
Android: https://play.google.com/store/apps/details?id=cz.edhouse.mc.android&hl=en
There is of course also an APP. You can use Sejf. It works in Prague, Brno and few other cities
(you can link your credit/debit card with it and pay directly as you need, English language is supported)
Android: https://play.google.com/store/apps/details?id=cz.edhouse.mc.android&hl=en_US