Hi,
You have restricted your payment method to only display when the address of the user is in australia, and that the shipping method selected by the user is "standard postage".
I suppose that it's not what you want. Please remove the zone restriction and the shipping method restriction that you set.
These two points are clearly mentioned in the FAQ:
5/ If you restricted your payment methods to zones, check that the address you're using is inside those zones ! Otherwise the payment methods will be filtered out.
8/ When you select a currency or a shipping method in the options of the payment method, the payment method won't display unless that currency or shipping method is selected during the checkout. In most cases, these parameters shouldn't be selected so make sure they are unselected. To unselect them, you need to press the ctrl key and click on the selected currencies or shipping methods.