"FlyerTalk documents Samsung codes as remarkable — one user reported 70% off at the Grand Hyatt Hong Kong. HotelCorporateCodes.com rates Samsung as "Sometimes" for ID verification at Hyatt. Hyatt's general pattern: Park Hyatt checks most frequently, Grand Hyatt and Regency occasionally, Hyatt Place/House rarely. Hyatt is described as "notorious for checking for ID," especially internationally. One user documented 50% ID check rate across Hyatt stays in 10 countries, mitigated by self-printed business cards which "worked 100% of the time.""

"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."

"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."