Greetings, everyone! It is my first post here. I have some questions about the use of Hertz CDP code. I am helping my friends in Hongkong to rent a car when they visit LA in a few days. I have a code that I tested working, but when they did exactly the same thing as I did, they could not obtain any discount. Is it because they were using Hongkong's internet? Can Hertz.com detect IP address and determine if a code is working or not? I can certainly book the car here in Maryland using my computer and put their name and credit card on the reservation, but would they experience any troubles when they go pick up the car at Hertz using their international driver license and HongKong ID?

Many thanks for your help!