Charging at the vehicle’s home charging station is included in the tariff (activate charging with the caruso charging chip).
In every combustion engine car you’ll find a ROUTEX fuel card in the vehicle. You can use this to refuel at all ROUTEX partners (ARAL, BP, ENI, OMV).
You can find information about public charging in Austria and abroad and the corresponding costs in the article “Charging at home and abroad”.