3d secure is not validated ne demek?

3D Secure is an added layer of security for online credit and debit card transactions. When a customer makes a purchase online, they may be redirected to a page where they have to enter a password or code to authenticate the transaction. This helps to prevent unauthorized use of the card and reduces the risk of fraud.

If a transaction is not validated with 3D Secure, it means that the customer did not complete the additional authentication step. In some cases, this may result in the transaction being declined by the card issuer or the merchant's payment processor. It is important for both customers and merchants to ensure that 3D Secure is enabled and utilized to protect against fraud and provide a secure online shopping experience.