"Alibaba's Marriott code A7A is for the Chinese e-commerce and technology giant. Alibaba employees primarily carry Chinese company-issued credentials which Western hotel front desk staff are less familiar with verifying. FlyerTalk's corporate code thread notes that Chinese tech company codes at US and European properties face a different verification challenge: staff may request proof but be unable to assess the validity of Chinese corporate ID cards. Marriott's rate desk has documented Alibaba as a monitored account given the company's rapid growth and high travel volume. High risk due to systematic verification challenges."

"As mentioned before some rates only company employees can use; others vendors/consultants can use. It's determined by what was negotiated w/ the company & Marriott. Rate rules will usually say it. BTW - some corp codes don't have id required in the rate rules. If you booked a legit corp rate & it didn't have that, I'd say you have a good case to the front desk to say it wasn't required. I would also print out the appropriate rate rules & staple them to the confirmation page. Of course if it does say id required, behooves you to have it."

"I left Deloitte in 2010. I’ve been using their corporate code ever since. Not once in the hundreds of times I’ve checked into a hotel has anyone asked me for proof of employment."