"JP Morgan Chase's Marriott code JPM is a high-profile financial institution code. FlyerTalk's "Corporate ID required???" thread specifically mentions financial sector codes in NYC/Chicago as more likely to be audited: "The SF Marriott was specifically noted for cracking down on corporate code abuse." Chase has massive employee headcount (250,000+) making verification less targeted, but JPMorgan's Marriott discount at full-service NYC/Chicago properties can be substantial. hotelcorporatecodes.com: "⚠️ Sometimes." Business travel hubs (Manhattan, Chicago Loop) carry higher risk."

"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 have been asked to show some proof couple of times. I normally show my corp id but credit card with employers name on it has worked, too. As would probably just showing my laptop with employer e-mail account or whatever. My impression has been they are happy with just about anything that proves I'm working for the company whose rate I use and why wouldn't they."