In order to protect against misuse, since 2021 every customer who wants to pay with a credit card on the internet must observe an additional step when releasing the payment, in addition to entering the card data. This security measure for authentication is mandatory for online orders with a credit card in Europe. The additional security is provided by the 3D-Secure procedure, which is intended to prevent an unauthorised third party from using your credit card data to purchase goods online at your expense by entering a password, fingerprint or TAN.