# Card Security Code (CSC)

Card Security Code (CSC) is a security feature that protects against fraud. It ensures that credit card transactions can't be made without it being in the cardholder's possession.

<table><thead><tr><th width="136">Response Code</th><th>Message</th></tr></thead><tbody><tr><td>M</td><td>The CSC matches the issuing bank’s records</td></tr><tr><td>N</td><td>The CSC does not match the issuing bank’s records</td></tr><tr><td>P</td><td>The CSC was not processed</td></tr><tr><td>S</td><td>The card should have a CSC, but merchant indicated it was not present</td></tr><tr><td>U</td><td>Card issuing bank does not participate</td></tr><tr><td>X</td><td>Unknown / No response</td></tr></tbody></table>


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