What is one main feature of the Card Verification Service?

The Card Verification Service (CVS) is primarily designed to enhance the security of card-not-present transactions. One of its main features is the validation of the card verification value (CVV) on behalf of the card issuer. This process ensures that the CVV provided by the cardholder matches what the issuer has on record for that specific card. By doing so, it helps to mitigate the risk of fraud by confirming that the person attempting to conduct a transaction possesses the actual card or is authorized to use it, even if the physical card is not present.

The other options, while relevant to the context of payment processing, do not accurately describe the main function of the Card Verification Service. Generating a unique 3-digit value for transactions pertains more to transaction identification rather than a service validation. Measuring cardholder creditworthiness involves assessing the financial reliability of an individual, which is not a function of the CVS. Tracking cash advances for accounts relates to managing and monitoring cash withdrawals and does not fall under the scope of card verification services. Thus, the validation of the card verification value accurately captures the essence of what the CVS is designed to do.