Abstract: A method for authentication of a user (1) to an acceptance point (3), the authentication being performed by comparing a transaction number (Trx1D) with a computed or stored transaction number (Trx1D), wherein the acceptance point (3) and/or a user terminal (2) sends a request message to a central point (4) and the central point (4) provides and transmits a temporarily valid transaction number (Trx1D) by means of which authentication of the user (1) to the acceptance point (3) can be performed, or that the acceptance point (3) provides a temporarily valid transaction number (Trx1D) by means of which authentication of the user (1) to a central point (4) can be performed, an authorization after successful authentication to the central point (4) being performed by the generation and transmission of an authorization message from the central point (4) to the acceptance point (3).

Abstract: A method for processing a parking transaction using a mobile communication device connected to a public mobile communication network includes: determining location-based data that establish a location where the mobile communication device is currently located; transmitting to a central management and monitoring device the location-based data and an individual identifier that is stored in the mobile communication device; converting the location-based data to a predefined parking zone; and checking, in response to the individual identifier, whether a user of the mobile communication device is entitled to park a vehicle in the parking zone.