To use a prepaid gift card from Visa, MasterCard, or American Express, you must add your billing address to the card. Prepaid Gift Card Info On the back of the card you can find either a website address where you can register your billing address directly, or contact information for the card issuer.

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For American Express, it's the four digits on the front of the card.

For MasterCard, Visa or Discover, it's the last three digits in the signature area on the back of your card.