do let us know if it works for an overseas hilton stay
Firstly it's worth noting this is an Amex offer, not a Hilton offer.
The T&C's state (my bolding)
Card Members must register by saving this offer to this Card,
book direct with Hilton Hotels & Resorts or DoubleTree by Hilton Hotels in Australia, and spend $250 or more on their accommodation including any other spend charged to their room, on their registered Card in one or more transactions, between 18/08/15 and 18/11/15 to receive one $50 statement credit.
Participation is limited to the first 20,000 Cards to register, and the offer is limited to one statement credit per registered Card.
Offer valid only by booking direct with Hilton Hotels & Resorts or DoubleTree by Hilton Hotels in Australia. 'Book direct' refers to booking or reserving a room via any 'Hilton booking Channel'. Booking channels include: Hilton HHonors Customer Care (call centre), any of their Brand.com sites (such as: HHonors.com, Hilton.com, Doubletree.com etc.) or directly on premise with the hotel.
Note it does NOT say the
booking must be in Australia it say's you must
book in Australia. MY bet would be that if Amex get a charge from the merchant code used by Hilton Australia you will get the credit, Amex will be giving the rebate based on the merchant code not the physical location of the hotel.
So I think the answer to this question depends on how you book rather than the location of the hotel. Via the Australian Call Centre very likely to get the credit, direct with the overseas hotel, almost certainly not. My understanding of the website is they dont have location based website so once again probably not.
Of course that's just an opinion.
Some of their previous promotions (e.g. the Woolworths one), have said that they can be in more than one transaction, and it has certainly worked. Why split the stay up. Just split the payment across cards.
Agree with this, Amex are the ones giving the credits, they will see multiple transactions, they wont know its one stay.