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How to use an american express gift card
Call customer service to activate the card if you bought the card yourself.
If you have all of the purchase information for your gift card, you can call american express directly to register the card. Call 1-877-297-4438 to speak with an american express customer service agent.
You'll need to provide your name, billing address, and some information off the receipt (if you have it). First, you'll enter the card information (the 16-digit card number and the 4-digit security code) through the automated system.