"NEC's Hyatt code (16733) is for the Japanese electronics and IT company. Hyatt Asia-Pacific enforcement is near 100% at Park Hyatt and Grand Hyatt properties. NEC has significant presence in Japan, where Grand Hyatt Tokyo enforces verification consistently. A FlyerTalk user with 40+ Hyatt stays across 10 countries reported 50% ID check rate overall with Asia being much stricter. NEC employees in Japan recognize Park Hyatt as a standard business travel tier, and staff there are similarly familiar with NEC employee credentials."

"I use MY job's corporate code when booking personal travel. Most companies have a list of which hotels they contract with also allow personal bookings. If you're improperly using a corporate code, the hotel can cancel your booking or change your rate at check in."

"Just wanted to let you know that I tried using this code at Hyatt Regency Istanbul, and the guy asked me for ID. I explained that I was a contractor, but he wouldn't buy it and requested further verification. I told him to just charge me the regular rate, and I would get reimbursed. It was only a 25 euro difference per day."