Hi,
During my stay with Hongkong, I also plan to do a 1 day trip to Macau, can I used the octopus card to buy the round trip ferry fare from Hongkong to Macau? Can I use it for buses, taxis and fast food chains in Macau?

Are you able to tell me how much is the minimum amount you can buy for Octopus card?

Also, can I buy Hongkong and MOP dollar with Australian currency?

Thanks.

Jean