I just send the Amazon gift card to a different email account than I have registered with Amazon to be sure it works. You don't apply the Promo Code (when you get it), like a gift card, but as a promo code.
Give $50 in Amazon Gift Cards, Get a $10 Promotional Credit for Yourself
Enjoy this e-mail-exclusive offer: Surprise someone with an Amazon.com Gift Card, and get a $10 promotional code to spend on yourself. Just purchase at least $50 in Amazon.com Gift Cards by August 31, 2013, and we'll email you a $10 promotional code to spend at Amazon.com this fall. A perfect present for any occasion, Amazon.com Gift Cards can be sent via e-mail, posted on Facebook, printed at home, or sent through the mail (with Free One-Day Shipping). Amazon.com Gift Cards are redeemable storewide for millions of items and never expire. Learn how to use your promotional code. Terms and conditions apply; learn more.
Important Notification: This offer is good ONLY to customers who received the e-mail invitation. If you did not receive an e-mail invitation, you are not eligible for this offer. Customers receiving the invitation must use the Amazon.com account associated with the e-mail address to which the invitation was sent in order to qualify.