Your SecureCode/3D Secure password is personal to your VISA or MasterCard. When you purchase from most retailers at the end of the online transaction a window appears and will ask you for this number. If you have forgotten the password you are given the option of re-setting this. If you choose this option you will be prompted to answer some security questions before resetting the password. Once reset you can continue to complete the order.

The payment system verifies all of your details with those held by the bank, if any information is not exactly the same as the bank the payment will be rejected. The core elements to check are:
Name: This should be exactly as it appears on the card
Billing Address: This must match the address as it appears on your bank statement
Card Number: Please enter with no spaces
Start / Expiry Date: Check the details and format
CCV: This is the last three digits shown on the signature strip on the reverse of the card.

If all of the details are correct the issue may be caused by the 3DSecure (Verified by Visa or MasterCard SecureCode) verification. This system setup by your card issuer to manage online fraud and protect your account and we cannot override or change the details therefore you will need to contact your bank or card issuer to check that there are no problems with the 3DSecure system on your account.