The card security code (CVV) is a 3- or 4-digit code that provides additional protection against credit card fraud. By requesting the card security code, Citilink validates the online reservation by the customer in possession of the credit or debit card and the account is valid. The card security code (CVV) is on the back of the card in the signature panel. You will see a 3 digit code after all 16 digits of your credit card number or only the last 4 digits of your credit card number. This 3 digit code is your card's security code code. Citilink will not saved your security code. Validation will be done at the beginning and the code will not be saved

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