This is a great question! Although there is no functionality built into our system to allow this, there are two potential solutions:
1) If your friend has not yet used the gift card funds, they can enter the details under the FanCodes section of your profile (or provide you the card number and potential pin code, depending on the gift card type).
2) If your friend used the gift card or does not have the information to provide, they can contact a Community Moderator by private message (envelope icon in the upper right corner of the page) to authenticate their account and request that we remove the gift card/credit from their profile and add to yours. This means they will also need your email address and primary zip code on file, so you may want to provide these details ahead of the contact.