"WPP Group's Hyatt code (10167) is for the world's largest advertising holding company (parent of Ogilvy, JWT, Grey, etc.). WPP has a major London/NYC presence. Hyatt's enforcement pattern: Park Hyatt and Andaz properties in London and NYC carry higher verification risk for corporate codes. FlyerTalk's Hyatt thread documented 50% check rate at Park Hyatt across multiple countries. WPP's diverse subsidiary structure means hotel staff may have difficulty confirming WPP employee status vs. a subsidiary employee."

"We are pleased to note you have a future reservation on xxxxxx, 2010 made through hyatt.com. I do kindly ask that you bring your valid working ID in order for us to be able to confirm the corporate rate at time of check-in which will be cross referenced with the company. Unfortunately of late we have been experiencing misuse of some of our corporate rates, with your company a target and we have had to implement tighter controls in this regard."

"I was referring specifically to a corporate ID. I know international properties ask for passport. What I mean is that I have always been asked for both my corporate ID and personal ID every time I've used a corporate code at an int'l property."