The VVT Radbox app is an electronic booking and access system for secure bike parking facilities. The bike parking facilities serve both long-term tenants (e.g. week, month, year) and spontaneous users (e.g. day use). The system uses a PIN code to reliably open any bike parking system that is controlled via an electronic door opener. Alternatively, depending on the location, a QR code or an RFID card can be used as an access medium. The user books the parking space in advance using the VVT Radbox app.