If you pay by credit card, a 3D Secure procedure may be carried out by your bank as part of the purchase process. The 3DSecure procedure serves the security of credit card payments on the Internet. It is intended to ensure that the legitimate credit card holder is actually the originator of this payment. You will then be redirected to either the "Verified by VISA" or "Mastercard SecureCode" process in the purchase process and can release your transaction according to the method set up by your bank, e.g. via SMS or by means of a temporary code.
If your transaction cant be authenticated using the 3D Secure method, it will be rejected or fail on Brezzels.