troubleshooting Question

CVV2 algorithm

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brdrok asked on
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we are in the process of re-designing our website in such a way where the user is required to enter a CVV2 value.  For the PAN (Primary Account Number) there is this algorithm that allows us to check the validity of that number prior to posting that page back to the server and/or to the authorization service.  I was wondering if there is algorithm or checksum for the CVV2 values.

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