How does mobile refueling work?

Mobile refueling works as follows:

1. Open the app when you are at the gas station and at the desired pump.
2. Select the option 'Refueling' at the bottom of the menu.
3. Select the correct gas station from the list and press 'Refuel now!'
4. Select the correct pump number.
5. Select the amount for which you want to refuel and press 'Pay now'.
6. As soon as the payment has been completed, you can start refueling.
7. Finished? Hang the hose back into the pump.

You pay the actual amount that has been filled up. You can see this under 'History' in the app.