The Radlparken Regensburg App is an electronic booking and access system for secure bicycle parking facilities. The bicycle parking facilities serve both long-term tenants (e.g. week, month, year) and spontaneous users (e.g. daily use). Using a PIN code, the system reliably opens any bicycle parking facility 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 via the Radlparken Regensburg app.