"I use IBM’s corporate code and have never been asked for ID once. Also never have worked for IBM"

"If you book under IBM's discount, you need to have an IBM ID at check-in. Employment verification documents (badge, business card, email screenshot) should be carried in case of verification. If caught using without ID, they will charge walk-in rate."

"You can go ahead and book. I've done it before. However, make sure to bring you company ID badge or business card to make sure your eligible for the rate. I don't know if things changed in Shanghai (China) specifically (I stayed at the Waldorf Astoria Shanghai and wasn't asked for it), but I got asked for mine when checking into the Hilton-affiliated hotel I booked in Japan. I think the overall global policy is to check that you are eligible for the corporate rate, but how and if it is implemented differs across properties in each locality. In your booking just book three rooms all at once under a single reservation."