It seems like this topic is still pretty unanswered, I will be staying at a Hilton in london quite a lot and the room is being booked by the person I am travelling with is also paying for the rooms on an amex. According to the helpdesk I will not get credit as I am not paying for the room.... I find this strange as the room is being paid for, just not by me... According to the helpdesk is is not even possible to put the room on my name which would mean both rooms are on my collegues name (true, saw it last time..) although only one room will receive credit....