Allow authentication using an RFID-tag on those chargers that support that, e.g. Easee. This will be convenient since you do not have to open your phone and the Monta-app to authenticate yourself to the charger. I am used to having a small RFID-tag linked with my car-key. This will also make the Easee-cloud outages transparent, since the Easee charger can be set up to authenticate offline using an RFID-tag. Setting up the RFID tag could be done the same way as done by the Easee-app.