^ I'm really sorry, I personally can't help you, because the credit card is my mum's. =(
There are people offering to help on AyuChina, but I don't really understand how it all works there. v___v I think you can book tickets even if you are not in Hong Kong, so as long as you have a Hang Seng credit card. Borrow one? =/
I'm sorry I'm of no help.