"Marriott luxury properties near financial hubs like NYC and SF have dedicated rate integrity teams. The SF Marriott was specifically noted for cracking down on corporate code abuse. HotelCorporateCodes.com rates Goldman Sachs as "Sometimes" for ID checks. No documented full-rate charges found in public forums, but Asian properties are more likely to ask; US properties inconsistent. Business card typically accepted when asked."

"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."

"I occasionally try to get the corporate rate for a company I'm visiting in the area (for sales/consulting). Only once has a front desk clerk asked me to prove my eligibility, and she was satisfied by me giving the name and telephone number of the person I was visiting."