TOLL2GO is a service run jointly by ASFINAG and Toll Collect, the German toll system operator.
Once registered, drivers can pay Austrian tolls using the Toll Collect on-board unit (OBU). The toll fees are still billed separately by each toll operator.
The TOLL2GO service is free to existing ASFINAG and Toll Collect customers. New customers (i.e. those signing an initial contract) pay a one-off processing fee of 5 EUR.
You already do have access to the SelfCare Portal: