Where can i buy Macau pass at local international airport? For unused credit, can i get refund?

As I know, you can buy the pass card in the OK convenience Store in the airport. The card itself cost MOP30, and the first reloading is about MOP100. For the unused credit, you can get the refund.

In the airport, you can take the bus No. 26 to Inner Harbor. Getting off the bus, you will see the hotel.

Thanks Tanzania for your comment. May i know where can i get refund at airport for macao pass?

Well, I'm afraid that you cannot get the refund. You can just get back the deposit of MOP30.
In addition, the airport doesn't have official Macao Pass Service Center. Thus you can go the following places:
Macao Pass Customer Service, near Rua Do Campo.
Transmac Sales Center, near Portas Do Cerco (Border Gate)