You need to show them your passport, hotel reservation and return ticket.

Thanks for your prompt reply earlier to show my passport, return ticket & hotel reservation on my entry to Macau airport. But will the hotel reservation on my Japan friend's name work fine, as she did not know my plan to join her for travel in chistmas holidays.
I can get the softcopy from her of that reservation if required to be shown by me.

The Hotel Reservation in your Japan friend's name is not accepted by macau Immigrant, but please don't worry, your valid passport and return flight ticket are sufficient for you to pass the Macau custom.