Method for operating a parking facility for which a charge is due, in particular a parking facility for at least partially electrically operated vehicles which has a plurality of current charging points (5, 6, 7), the method comprising the following steps: - on entry of a vehicle into the parking facility, receiving a first data set by an evaluation device, the first data set comprising an identifier identifying a user of the parking facility, an identifier of the entry of the parking facility and a first time stamp, - on exit of the vehicle from the parking facility, receiving a second data set by the evaluation device, the second data set comprising the identifier identifying the user of the parking facility, an identifier of the exit of the parking facility and a second time stamp, - transmission of user-related data to the evaluation device by the user, - generating a transaction identifier by the evaluation device and sending the transaction identifier to the user, wherein the transaction identifier is generated either automatically or upon prior request by the user after receipt of the first data set by the evaluation device and the generated transaction identifier is assigned to the user by means of the user-related data, - initializing a charging process at a charging point (6, 7, 8) by transmitting the transaction identifier to a user interface of a charging device providing the charging point (6, 7, 8), - receiving a third data set from the current charging device providing the current charging point (6, 7, 8) by the evaluation device, the third data set comprising the transaction identifier, an identifier of the current charging point (6, 7, 8) and a third time stamp, - receiving a fourth data set from the current charging device providing the current charging point (6, 7, 8) by the evaluation device, the fourth data set comprising the identifier of the current charging point (6, 7, 8) and a fourth time stamp, and - in an evaluation process, evaluation of the received data sets (30, 34, 43, 50) by the evaluation device, wherein a parking process is determined by means of the first and the second data set (30, 34) and a current charging process is determined by means of the third and the fourth data set (43, 50), and wherein the current charging process is assigned to the parking process by means of the transaction identifier. - on entry of a vehicle into the parking facility, receiving a first data set by an evaluation device, the first data set comprising an identifier identifying a user of the parking facility, an identifier of the entry of the parking facility and a first time stamp, - on exit of the vehicle from the parking facility, receiving a second data set by the evaluation device, the second data set comprising the identifier identifying the user of the parking facility, an identifier of the exit of the parking facility and a second time stamp, - transmission of user-related data to the evaluation device by the user, - generating a transaction identifier by the evaluation device and sending the transaction identifier to the user, wherein the transaction identifier is generated either automatically or upon prior request by the user after receipt of the first data set by the evaluation device and the generated transaction identifier is assigned to the user by means of the user-related data, - initializing a charging process at a charging point (6, 7, 8) by transmitting the transaction identifier to a user interface of a charging device providing the charging point (6, 7, 8), - receiving a third data set from the current charging device providing the current charging point (6, 7, 8) by the evaluation device, the third data set comprising the transaction identifier, an identifier of the current charging point (6, 7, 8) and a third time stamp, - receiving a fourth data set from the current charging device providing the current charging point (6, 7, 8) by the evaluation device, the fourth data set comprising the identifier of the current charging point (6, 7, 8) and a fourth time stamp, and - in an evaluation process, evaluation of the received data sets (30, 34, 43, 50) by the evaluation device, wherein a parking process is determined by means of the first and the second data set (30, 34) and a current charging process is determined by means of the third and the fourth data set (43, 50), and wherein the current charging process is assigned to the parking process by means of the transaction identifier.