Ltd. , operator of Chinas biggest online commerce site for business owners, will audit all exporters that pay the company to market their products after some buyers were defrauded. The company will visit the facilities of all paying members of its China Gold Supplier program over the course of a year, Director of International Marketing Linda Kozlowski said at a briefing in Hangzhou, east China today. The onsite check will help lower fraud on Alibaba.coms website, she said.