Aachener Parkhaus GmbH is the official developer of Parken bei der APAG that can be found in the Maps & Navigation category. The tool was downloaded and installed by over 1K users and its most recent stable release was on Oct 13, 2020. People rated this application 4 on Google Play.
It's free of charge to get the installation package of Parken bei der APAG, also, you can have a look at users' reviews on Droid Informer. The app works fine on Android 4.1 and above. It's secure to download the app.