Westpac® , and Australian-based bank is issued a dual-branded Amex® / MasterCard® . When a retailer does not accept American Express® , the card would be used as a MasterCard® . Australia's leading paper, The Herald Sun described how the card will work, but as with other commentaries on these new American Express® co-branded card, the question surrounding interchange fees remains unanswered.
[source: WayTooHigh.com, as read in The Herald Sun, March 28]