A major security feature are our push notifications for every account transaction. So, if something odd is going on, you're in the picture right away. You can, of course, immediately change your card pin in the app or block your card. Our support is of course open for questions and requests as well. Important changes in the app and transfers must be authorised via TAN authentification. Some online payments with your debit card are also secured by a TAN authentification process. Please pay attention to the Verified by Visa or Visa Secure badge here. If there is none, you won't need a TAN for the payment authorisation. You can find more information about Visa Secure here