Digital certificate and reservation

An access control system for electric vehicle charging comprising:

• a) an access device comprising a communication module connected to a processor having control of an electric vehicle charger;
• b) a secure reservation interface to receive a reservation request from a first device for a reservation at a given destination, the reservation interface comprising one or more screens for receiving a selection of a location at the destination and an interval of the reservation;
• c) a reservation server, in communication with the reservation interface and a network, to:
• receive the reservation request for the destination, the reservation request including a selected location at the destination and an interval of the reservation;
• issue a reservation certificate describing the interval of the reservation based on the reservation request and the selected location;
• and transmit, via the network, from the reservation server to a second device distinct from the first device, the reservation certificate and a communication setting corresponding to the access device;
• d) an application installed on the second device to receive the reservation certificate and the communication setting corresponding to the access device, wherein the application determines whether the reservation certificate is revoked on the basis of a further communication with the reservation server, wirelessly transmits the reservation certificate to the access device using the communication setting upon receipt of a command to activate the electric vehicle charger if the reservation certificate is not revoked;
• and,
• e) wherein, if the reservation certificate is not revoked, the access device receives the reservation certificate from the application based on use by the application of the communication setting, and the processor activates the electric vehicle charger based on at least the receipt of the reservation certificate, otherwise the processor does not activate the electric vehicle charger.