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    <p>It is called the <a href="http://en.wikipedia.org/wiki/Card_Security_Code" rel="nofollow noreferrer">Card Security Code (CSC)</a> according to Wikipedia, but has also been known as other things, such as the Card Verification Value (CVV) or Card Verfication Code (CVC).</p> <blockquote> <p>The second code, and the most cited, is CVV2 or CVC2. This CSC (also known as a CCID or Credit Card ID) is often asked for by merchants for them to secure "card not present" transactions occurring over the Internet, by mail, fax or over the phone. In many countries in Western Europe, due to increased attempts at card fraud, it is now mandatory to provide this code when the cardholder is not present in person.</p> </blockquote> <p>Because this seems to be known by multiple names, and its name doesn't seem to be printed on the card itself, you'll probably (unfortunately) still need to tell your users how to find the code - ie by describing it as the "3 digit code on back of card".</p> <hr> <p><strong>2018 update</strong></p> <p>The situation has not improved, and is now worse - there are even more different names now. However, you can if you like use different terms depending on the card type:</p> <ul> <li>"CVC2" or "Card Validation Code" – MasterCard</li> <li>"CVV2" or "Card Verification Value 2" – Visa</li> <li>"CSC" or "Card Security Code" – American Express</li> </ul> <p>Note that some American Express and Discover cards use a 4-digit code on the <em>front</em> of the card. See the above linked Wikipedia article for more.</p>
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    1. POWhat is the official name for a credit card's 3 digit code?
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    1. COThank you for the quick response.
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      1. USMike Wills
    2. COFYI, not all cards written the code in the back side. AMEX cvv code is in the front and 4 digits.
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