A service fee of 0.50 EUR per parking transaction indicates one of the following reasons:

• An activated Parkster Complete feature
  You are using the additional features of Parkster Complete (such as overpayment protection, family account, and more). Additionally, as a registered user, you can choose whether to pay monthly or directly.
  
  
• Express parking with direct payment
  You paid directly through Express parking without registration.

Good to know:

• This service is completely optional and can be activated or deactivated by you at any time through the app under More.
• Here you can find an overview of all the attractive benefits of Parkster Complete.
• If you parked using an Express account, you can find out here, how to switch to a registered account.