To complete the online setup to activate your American ExpressServe card:
After completing the online setup, you will be prompted to activate your card. You can activate your Card online at American ExpressServe®. You will need the card number and the three-digit CSC from the back of the card.
Once your card is activated, you can follow the prompts for additional information about your American ExpressServe Card.
Note that any link in the information above is updated each year automatically and will take you to the most recent version of the document at the time it is accessed.