Will I be charged a fee when making transactions in a foreign currency using my Card?

Yes, you may be charged a Currency Conversion Fee*: this is a fee that is payable on charges processed in a currency other than Australian dollars. 

Check out the complete fee information here.

*Currency Conversion Fees. If you make a charge in a currency other than Australian dollars, that charge will be converted into Australian dollars. The conversion will take place on the date the charge is processed by us, which may not be the same date you make the charge. If the charge is in U.S. dollars, it will be converted directly into Australian dollars. In all other cases, it will first be converted into U.S. dollars and then into Australian dollars. However, you will only be charged one Currency Conversion Fee. Unless a specific rate is required by law, conversion rates will be used based on interbank rates selected from customary industry sources on the business day prior to the processing date. If charges are converted by third parties prior to being submitted to us, any conversions made by those third parties will be at rates and may include a fee selected by them.