Not sure if this could help anyone, but I found this in my Amex today. Someone might find it useful. It only shows up on one of my Amex blue. 1/5 amex cards.
Receive $300 in Yelp Ads from 5/15/17 – 8/18/17 when you purchase a minimum of $300 in Yelp Ads using promo code 0517YELPAMEX300 online at biz.yelp.com/amex. Offer valid when you pay with any American Express Credit or Charge Card. The promo is valid for eligible, first time purchasers of Yelp Ads; subject to additional terms and conditions (https://biz.yelp.com/tos/upgrades_en_us_20160928
). Offer cannot be combined with any other promotions/offers/savings. Offer is not redeemable for cash and is not valid on previous purchases. Businesses that are in industries that are not eligible to advertise on Yelp pursuant to Yelp's own terms or policies may not be eligible for the offer. Fulfillment of the offer is the sole responsibility of the participating American Express Merchant. POID: CGLJ:0001