The CVV is the result of an algorithm which calculates elements of both the card number and the expiration date. If you ever try to use the old CVV for an expired card or key the wrong expiration with the correct CVV, it wonu2019t work.The CVV is there to protect you, the cardholder, from unauthorized use on the credit card. It, in theory, ensures that the person making a u201cCard Not Presentu201d (CNP) purchase has the card in hand and can see the CVV. Of course, if you could guess or calculate it using the card number alone or the card number with the expiration date, then it really wouldn't be serving its purpose in protecting you.The only legitimate way to make an online purchase with your card is to wait until you have your card in hand or, if itu2019s lost, have Customer Service overnight you a new one. Most card companies will do this.If you have a relationship with the Merchant, you can contact them and see if theyu2019ll process the card as a card present transaction without the CVV, but they will pay a higher Interchange fee for taking the added risk.