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What is the Card Security Code?
Using the Required Card Identification (CID)
A CID is a special security code on your American Express, Diner's Club, Discover, MasterCard or Visa credit card.
How does my CID protect me?
CIDs are not raised, so they are not scanned into standard credit card readers. In theory, these numbers are only visible to you. When you give your CID to a merchant, you assist the merchant in verifying that the order is being placed by you, the card holder.
Why does TAT ask for my CID when I place and order online?
TAT requires you to enter your CID whenever you place an order online to help us detect fraudulent use of your card before your account is charged. This simple step allows us to greatly enhance the safety and security of our ordering process. You may receive a call from us to verify your order if your CID is missing or invalid. 
Discover/Novus Card Users
Flip your card over and look at the signature box. You should see a 16-digit credit card number followed by a special 3-digit code. This 3-digit code is your CID, like VISA and MasterCard. 

Visa Credit Card Users
Flip your card over and look at the signature box. You should see a 16-digit credit card number followed by a special 3-digit code. This 3-digit code is your Card Security Code. 

MasterCard Credit Card Users
Flip your card over and look at the signature box. You should see a 16-digit credit card number followed by a special 3-digit code. This 3-digit code is your Card Security Code.

American Express Credit Card Users
Look for the 4-digit code printed on the front of your card just above and to the right of your main credit card number. This 4-digit code is your Card Security Code.