"A Fishbowl post titled "Anyone ever use another company's corporate discount code for Marriott? XOM Exxon code is showing a significant discount" directly references this code, confirming community awareness. FlyerTalk confirms Marriott is usually strict about corporate codes: "Consultants who tried to use a former company's code were required to produce a valid company ID. Since they couldn't, they were charged the full going rate of $300 instead of the corp rate of around $100." XOM is a ticker-style code with high profile."

"I think the generic 'show corp id' designation means show the company business card. I think a lot of us don't have them or, if we do & we're not going to an office that we'd need to show them, leave them at home. I worked for some F500s that didn't require corp ids with shiny smiling faces on them & others that did; same with company credit cards. All, however, provided biz cards when working for them."

"I now always make it a matter of course to carry documents (business cards of my contacts, e-mails requesting my visit etc.) from my host company when I travel. This has always proven sufficient for the few times I've been challenged by the front desk clerk."