"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 guess I just don't see this. I'm not saying rates never changes, but if it really changed every time someone booked a corporate rate, then the rates would change constantly. I can't say that I see this too often or ever. Also I doubt there's enough people doing this to have a huge effect on overall occupancy anyway."

"I use corporate codes all the time and never get asked. I shouldn’t be using them but, hey, it is what it is. The risk is you get that front desk agent (or even manager) who goes “I see your with the Coca-Cola rate, can I have your corporate Id please”? Has never happened to me yet but it is a risk. So book accordingly."