A usage-medium is the medium that is being used by the end-user to conduct a session. “Session” in this case can be a charging-session but also the usage of a car-sharing vehicle or other rentable objects.
Concrete usage-mediums in Gridware are:
![Gridware E-Mobility Native App](/wp-content/uploads/2014/07/Gridware_Iconwelt_Medium_Known_User.png)
E-Mobility Native App for contract-users
in the style of the EMP in question
![Gridware Internal RFID Card](/wp-content/uploads/2014/07/Gridware_Iconwelt_Medium_Generic_RFID.png)
RFID-Karte or dongle for contract-users
in the style of the EMP in question
![Gridware Internal Admin RFID Card](/wp-content/uploads/2014/07/Medium-Admin-RFID-Karte.png)
RFID Admin Card or Dongle for facility managers
authorized everywhere
![Gridware Instant Web App](/wp-content/uploads/2014/07/Gridware_Iconwelt_Medium_Instant_Usage-1.png)
Web-App for spontanous users
Entering usually via QR-Code Sticker (instead of publishing on a roaming platform)
![Gridware ISO 15118 Vehicle](/wp-content/uploads/2014/07/Gridware_Iconwelt_Medium_ISO15118.png)
ISO 15118 vehicle for contract-users or roaming-users
can authorize themselves via E-Mobility Account Identifier (EMAID)
![](/wp-content/uploads/2014/07/Gridware_Iconwelt_Medium_E_Hubject.png)
Third-party app for roaming-users
obviously only for publicized charging stations
![Plugsurfing EMP RFID Card](/wp-content/uploads/2014/07/Gridware_Iconwelt_Outpathed_3_Medium_Plugsurfing_RFID.png)
Third-party EMP RFID card for roaming-users.
obviously only for publicized charging stations
![Gridware 3rd Party App](/wp-content/uploads/2020/07/Gridware-3rd-party-App.png)
Third-party apps for contract-users
Connection directly with the Gridware API, valid for freely defineable charging stations.