Abstract: A computerized system for managing a parking lot includes: a beacon in one-way, or location sensor in two-way, communication with a smart device for locating the smart device without it having to determine its own location, a vehicle sensor for sensing the presence of a vehicle, and a computer-implemented server operable to determine from the beacon's identification or receive from the location sensor the location of the smart device. The server authorizes entry or exit of the vehicle when a smart device status indicates acceptance, and the smart device and the vehicle are both at a same appropriate location. The server updates the smart device status after a payment transaction. Entry or exit may be authorized by opening a barrier, displaying an authorization message, communicating a message to the smart device, and/or not issuing a non-authorization alert. The server may receive reservations, and may communicate lot occupancy to third-party systems.