Business conditions for US payment processor Wright Express are softening after a period of growth.Mike Dubyak, chief executive of WEX Inc, told a JP Morgan investor conference that "in Australia, the market has been pretty strong down there, but lately it's been softening a little bit [but it's] still a good economy. "Last year, our transactions' growth on our fleet card was 6.4 per cent," he said.The company said that in 2012 it processed approximately 16 million payment processing transactions in Australia, up from approximately 15 million in 2011.Business may soon lift again, having added 50,000 new vehicles in the last year, with "repeat partners… it's all of that kind coming to fruition in the second half of 2013," Dubyak said.He said that "in Australia, we have about 10 per cent market share, [with our Motorcharge and Motorpass fuel payment cards].""The program down there, when we bought it, was primarily focused on small businesses, so it's a distributed kind of customer base, three to five vehicles on average."We have been moving up-market, working with larger customers, bringing some of our expertise from the US to that market, and now working even with some of the leasing companies down there."Dubyak also said WEX planned to ramp up investment in its virtual card. Webjet is one early customer for this product.He said that there were "some wins [in Australia], either between signings or in our pipeline that we believe we're going to sign in the next six months.""We got four out of the top five travel companies in Australia. Based on that success, that's when we said we're going to continue to make investments and now we're looking at Asia Pac."Wright's chief executive in Australia, David Howell, recently left the company.