spent $300 or more on one or more transactions get a $30 credit. Offer valid through December 31, 2018 or while promotion last. Note, offer/availability will vary by cardholder. Be sure to login to your American Express account to see if you're eligible/qualified to activate the offer on your card.
Make sure to activate it under your "offers" when you log into your account BEFORE using the offer..
I wonder if it will work if you buy gift cards...could be a nice bonus to that spend $150 get $15 back they are currently running