gift card

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A plastic card that is linked, as by an identification number or an embedded chip, to an account containing a specified amount of money, given as a gift to be redeemed at a specified store or business.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A card issued by retailers as an alternative to a non-monetary gift, allowing the bearer to purchase goods up to its face value.