Once your MSUFCU Credit Card is enrolled in the MSUFCU CVVkey app, youre ready to start shopping online! When asked to enter the 3-digit "CVV2" code at checkout, instead of entering the code from the back of your card, you will use a randomly generated CVV2 code from the MSUFCU CVVKey App. This randomly generated code changes every throughout the day, which makes for a more secure online shopping experience.