"If asked to prove your company relationship, usually a business card is sufficient, but in some cases, you might need to show a company badge or a special company verification letter."

"I haven't tried using discount codes w/ Hyatt previously but this is intriguing. Some of these codes are tied to various companies. Does anyone who has used these codes before know if Hyatt front desk staff ask for corporate ID upon check-in if a reservation is booked using one of these codes? For example, 99800 is linked to Daimler-Chrysler Purchasing..."

"I actually used to work for the Park Hyatt Sydney several years ago, in sales and marketing. Every year corporate rates are negotiated based on the number of room nights from the previous year. I can assure you that the abuse of these codes will not go unnoticed. While a chainwide code may apply, it wouldn't be difficult for IBM to see that rates were being used at a property they may not utilise, such as the Park Hyatt Sydney due to the high average room rate, and realise that the code was being abused. They will also notice a significant spike in room nights booked."