I bought a Macy gift card on the previous Amex offer and got the cashback.

Details

Get a one-time $ 15 statement credit by using your enrolled Card to spend a minimum of $ 100+ in one or more transactions in-store at Macy’s or online at macys.com by 9/25/2017. See terms for exclusions.
Offer Terms

Enrollment limited. Valid at any participating location in the US and US Territories. Not valid at outlet locations (in-store and online). Excludes Nespresso boutiques, pop-up stores, parking garages, USPS, Stride Rite, Macy’s Bridal Salons, Macy’s Backstage, Macy’s Travel, Visit Macy’s, Shop For a Cause, New Zoom kiosks/vending machines, restaurants inside stores, delivery services, WorryNoMore Protection service, Nineteenth Amendment, Men’s Wearhouse Tuxedo Shops, Macy’s Shop at Home and design services and corporate sales. Not valid on purchases shipped outside of the US. Offer is non-transferable. Must add offer to Card and use same Card to redeem. Limit 1 statement credit(s) per American Express® online account. Statement credit will appear on your billing statement within 90 days after 9/25/2017, provided that American Express receives information from the merchant about your qualifying purchase. Note that American Express may not receive information about your qualifying purchase from merchant until all items from your qualifying purchase have been provided/shipped by merchant. Statement credit may be reversed if qualifying purchase is returned/cancelled. If American Express does not receive information that identifies your transaction as qualifying for the offer, you will not receive the statement credit. For example, your transaction will not qualify if it is not made directly with the merchant. In addition, in most cases, you may not receive the statement credit if your transaction is made with an electronic wallet or through a third party or if the merchant uses a mobile or wireless card reader to process it. By adding an offer to a Card, you agree that American Express may send you communications about the offer. POID: CHN9:0001