"Daimler Benz's Hyatt code (99800) is for the Mercedes-Benz parent company. Daimler has major presence in Stuttgart, Germany and significant US operations in Alabama (Mercedes-Benz US Manufacturing). Hyatt's European enforcement pattern applies: Park Hyatt Frankfurt/Munich/Stuttgart carry higher verification risk. FlyerTalk's Hyatt thread: "In Europe and some parts of Asia, proof has been requested 100% of the time." US domestic Hyatt Place: essentially never checked. Daimler later restructured as Mercedes-Benz Group AG."

"I can inform you that if someone checks into the Park Hyatt Sydney on a discounted corporate code, and I try to book a revenue stay, my rate will be higher than had they not used the code in order to stabilise the average room rate. This will occur at all Hyatt properties that operate with a floating rate of the day based on availability. So it does indeed affect you."

"We may have an issue of semantics regarding the travelzoo code. Often when Travelzoo has a special rate for a Hyatt Hotel that rate is also shown in the "Special Offers" section for the particular hotel on the Hyatt Website. The code for the comparable "Special Offer" is 13147 which is often referred to as the Travelzoo code. As this code is available on the website, it gets both stay credit and points. At least, this is my impression."