UPDATED: The Hilton Aspire credit card from American Express now comes with two semi-annual $200 credits, one each half a calendar year, which can be used towards
room rates, taxes, spas, meals, and other incidentals at any of the 200+ hotels listed
here.
Map view of all resorts
here.There are three ways to purchase someone's credit for use towards your room rate:
1)Use their card to book a prepaid rate online
2) Have them make you an AU and then use that card to pay for your room at check-in
Obviously, option 1 is more desirable than 2, or
3) Have the buyer send you a personalized link that pays to the resort.
Which is obviously the best.