The CSC (Card Security Code) field is a fraud prevention security feature for credit and debit card transactions, typically a three- or four-digit number found on the back of the card. It's used to verify that the cardholder has the physical card during online or phone transactions.
In Finalsite forms that collect payments, the CSC is required to process credit card transactions securely. By asking your constituents to enter this field in your forms, you are helping to protect your constituents from online credit card fraud.
The only exception would be if you are using recurring payments: see An Important disclaimer regarding CVV codes and recurring payments for further details.
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