Three-Domain Secure (3-D Secure or 3DS) is a special anti-fraud messaging protocol that allows consumers to authenticate themselves with the issuer of their bank card at the moment of transaction processing. It is an additional security layer that not only helps prevent unauthorized transactions on the internet but also protects fraud trading.
At the time the transaction is made, the bank who issued the card, asks the cardholder for additional authentication data to the CVV2, which can usually be a PIN code, a secret password/answer to a secret question, a unique code, or a one-time-password.
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