Abstract: An automatic payment system for the urban parking phases of vehicles using radio frequency (RFID), contemplating the implementation of a hybrid card for radio frequency identification (RFID-smartcard) which is installed inside the vehicle, integrated by blocks into which the system, together with the communication protocols used, has been divided, and has a series of buttons and an LCD display for the user to interact with the system without needing any other additional device and in which an ultra high frequency (UHF) RFID tag reader/writer, together with a passive tag adhered thereto, is placed, the objective of which will be to read and write the necessary data on the passive tag, which can in turn be read by an external, portable, neither fixed nor stationary RFID reader.