Method for charging location usages

A method for charging fees for location usages by on-board units in a road toll system by means of a separate payment transaction system, wherein the road toll system has a toll server, at least one toll terminal and at least one sub-system for determining the location usages, and the payment transaction system has a transaction server and at least one transaction terminal for payment cards, said method comprising:

• inputting an identification of an on-board unit into the toll terminal, generating a respective transaction identification and transmitting the transaction identification from the toll terminal to the transaction server via a first data connection therebetween;
• transmitting the transaction identification from the transaction server to the transaction terminal via a second data connection therebetween;
• inputting a card identification of a payment card into the transaction terminal and transmitting the card identification and the transaction identification from the transaction terminal to the transaction server via the second data connection;
• transmitting a substitute identification, generated in the transaction server and unambiguously associated with the card identification, and the transaction identification from the transaction server to the toll terminal via the first data connection;
• retrieving, in the toll terminal, the on-board unit identification associated with the transaction identification and transmitting the on-board unit identification and the substitute identification from the toll terminal to the toll server;
• and
• using the substitute identification in a communication via a third data connection between the toll server and the transaction server for charging a fee for a location usage determined by the sub-system under the respective on-board unit identification.