Thank you for your request.
Does your credit card use «3-D Secure Code» as a security element? If so, a page will appear during the payment process requesting identification (password, SMS, fingerprint, Face ID or Transactions App). This will clearly identify you as the cardholder. This pop-up window is automatically blended in by your credit card company and is not governed by the SBB.
I advise you to try again with another browser, maybe that’s the solution.
For further queries regarding payment using your credit card, please contact your credit card company.
I wish you a good evening.