Are multi-currency payments an issue when selling abroad? I'm totally new to receiving online payments and am genuinely curious about the issues surrounding accepting only a single currency.

As an Australian consumer I'm used to paying in USD and simply seeing a slightly different amount show up on my transaction history (AUD being generally at parity with USD)

Is having multi-currency support important? Does it impact sales? Is using something like money.js to give a close estimate of actual cost good enough?