Also note that even if the payment is charged in AUD, if the transaction is transacted outside Australia, you will likely still be charged an additional foreign transaction fee by your Australian bank/credit provider. So you may be charged twice for the "foreign transaction".
I have had this happen even when purchasing something on-line from a company with an office in Australia, the order quoted in AUD and the item shipped from their warehouse in Australia, but the transaction processed in the company's home country. In my example, the company HQ is in the UK and the credit card (Amex) transaction shows as being processed in the UK in AUD and Amex charged me a foreign currency transaction fee.
