With MasterCard, Visa and American Express credit cards you can pay directly at the barrier: Simply open the entrance barrier with your credit card. Repeat the same thing when exiting. You can skip the checkout at the automatic pay station.
Accepted credit cards:
Bahnhofparking P1 + P2, Bahnhofparking P3, Parkhaus Altstadt,
Parkhaus Casino-Palace and City-Parking.