In order to add credit to the student ID or canteen card, you can use the EC stations in the canteen or the Central Library. At the InfoPoint in the canteen, you can add to the credit with cash.
Guest cards that are no longer needed can be returned to the InfoPoint in the canteen, the depost and remaining credit are paid out there.
You can find further information on cards’ payment functions on the page of the Student Services Tübingen-Hohenheim.