Meh, US privilege! (That's a joke BTW.) Seriously though, I wouldn't dream of trying to pay a companion abroad in AUD. Obviously foreign currencies are accepted to a greater or lesser extent in some places and some circumstances, and USD more widely than many other currencies. For what it's worth, the donation I posted to Daddy was in USD not AUD. I had US banknotes from my last trip to the US but would probably have converted money to USD if I had not.