"Mitsubishi's Hyatt code (11657) follows Hyatt's standard corporate verification pattern. FlyerTalk users report 50% ID check rate across Hyatt stays in Asia, mitigated by "self-printed business cards that worked 100% of the time." Mitsubishi is a major Japanese conglomerate with strong presence at Hyatt properties in Tokyo, Osaka, and Singapore. Park Hyatt Tokyo has specific documentation of requiring "badge, business card, and email confirmation" for corporate rates. Hyatt Place/House properties globally: essentially never check."

"I can inform you that if someone checks into the Park Hyatt Sydney on a discounted corporate code, and I try to book a revenue stay, my rate will be higher than had they not used the code in order to stabilise the average room rate. This will occur at all Hyatt properties that operate with a floating rate of the day based on availability. So it does indeed affect you."

"Just FYI, the Hyatt Regency Kiev does require Corporate ID upon check-in. My corporate rate is 220 EUR instead of 410 per night and they were quite insistent on getting the corporate ID. Good thing I had it with me."