"Citigroup's Marriott code CIT is one of the most widely circulated financial sector codes. FlyerTalk users report: "Citigroup code has been posted on public sites for 10+ years — it's one of the most-shared codes in the community." hotelcorporatecodes.com lists CIT with "⚠️ Sometimes" verification. NYC-area full-service Marriotts (near Citigroup HQ in Tribeca/Park Avenue) are more likely to verify. US domestic outside NYC: 5-15% check rate. Europe/Asia: meaningfully higher. Business card typically resolves verification requests."

"I work as a consultant and frequently ask for and use my client's rates (at their insistence, since I will be billing them back). I have been asked for ID maybe one time in 15 since February, when it was announced in this forum that rates would be ID'ed."

"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."