That's great to know. I might load up my card the month before travel.I entered the ING card details via the PayPal window ["use any credit card"] offered by PayPal if you don't have an account with them, and/or don't want to use them on this occasion.
I may have exaggerated the saving as I didn't note exactly what PayPal would have charged in A$, but it was certainly more than 2.5% - approx. A$24+ rather than the A$22+ shown on ING.
Plus the 5 purchases is a but of a pain in the butt