3-D Secure is a security feature which ensures that payments using certain credit and debit cards are authenticated by the card holder with their bank at the time of the transaction. 3-D Secure is the common name for the technology behind MasterCard SecureCode (MSC) and Verified by Visa (VbV). If your card is enrolled with 3-D Secure, during the payment flow you will be prompted by your bank to enter a password to verify that the transaction is authorised by the card owner before completion. Your 3D secure password is set up between you and your bank to further secure transactions over the internet or where the card holder is not present. Please note that this is a security measure set up by the bank and not by STEAMCREAM. If you are enrolled in 3D Secure, you must correctly enter your 3D secure password for your payment to be authorised. If you have forgotten your 3D Secure password or do not know if you have set one up, you will need to contact your bank to retrieve these details in order to proceed with payment. If you are still having issues, please feel free to phone us on +44 (0) 2036 370 025 between 9am - 5pm GMT to place your order directly.