CVC (Card Verification Code) is an authentication procedure established by credit card companies to provide greater security for Internet transactions. Also known as CVV (Card Verification Value) or CSC (Card Security Code), this 3 or 4 digit code is different from the standard credit card number, and can be found on the front or back of the credit card depending on the type of card. By entering the code during online transactions, the card holder verifies that the card is currently in their possession, thereby reducing the risk of credit card fraud.

The CVC is generated by encrypting the credit card number and expiry date with an encryption key known only to the issuing bank. This number is not stored on a credit card's magnetic stripe, so it cannot be collected during normal offline purchases, and will not appear on any sales receipts or billing statements. As such, the only way to obtain the CVC number is to have the card in one's possession. After entering the CVC during an online transaction, the number is sent to the issuing bank to verify that the card number and CVC match. This validates that the credit card user had the actual physical credit card in hand when they placed the order.

On a Visa or MasterCard, the CVC is a three-digit number located on the back of the card, usually in the signature stripe or to the right of it. On some cards, the CVC number will be printed on the back of the card after a full reprinting of the credit card number, or the last four digits of the credit card number. On an American Express card, the CVC (called the CID on American Express) is a four-digit code located on the front of the card, usually printed (and not embossed) to the right of the credit card number. Please note the CVC number is a different number than your standard credit card number.

Verified by Visa is a unique value-added service that utilizes a Visa cardholder's personal password or identity information to help protect the credit card against unauthorized use. When using Verified by Visa, your Visa card number cannot be used for an online purchase without the submission of your personal password or identity information. Currently, Verified by Visa is available for most Visa cards from participating financial institutions.

If you are using a Visa card that has been activated for Verified by Visa, a Verified by Visa window will appear during the checkout process. An authentication page will appear, asking you to enter your password or identity information, which will then be verified by your credit card's issuing bank. Upon approval, your purchase will be processed as normal.

To see whether Verified by Visa is available for your Visa card, please contact your issuing bank or credit card company. Most participating financial institutions offer Verified by Visa.

Sometimes you will be provided the opportunity to join Verified by Visa during your online shopping experience. If this occurs, you'll be asked to provide information to verify your identity, and then create your password or identity information. After setting up your password or information, you will automatically be asked to enter your password or information to verify your identity when shopping at participating Verified by Visa online stores.

The CVC and Verified by Visa processes exist independently of each other, though they both serve the same purpose: to provide extra security for your online shopping experience. You will be asked to enter your CVC by YesAsia.com if your purchase is deemed necessary for an extra security check. A Verified by Visa window will appear during checkout depending on whether or not you participate in Verified by Visa with your credit card-issuing bank or institution. In some cases, both security procedures may occur. Please comply with both, as it will only expedite your order, plus insure that you enjoy the full protection both CVC and Verified by Visa offer.