When paying via credit card, you are required to input your credit card's CVC number each time you place an order.

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. 

To provide a safe online shopping experience and protect customers from unauthorized credit card use, YesAsia/YesStyle works with Retail Decisions to check transactions for fraudlent activity. Retail Decisions (ReD) is one of the leading fraud prevention companies in the e-commerce industry with over 20 years of experience.