What is the Card Security Code on my credit card?
The card security code is a unique 3 or 4 digit number printed on your debit/credit card. (This can be found on the back of your card, the last 3 or 4 digits within your signature field) This number is not embossed on the card and not printed on the sales receipts, thus making it difficult for anyone other than the genuine cardholder to know it.