HANGZHOU, China--(BUSINESS WIRE)--Tmall Global, China’s leading cross-border e-commerce platform, announced today the launch of a new “World Duty Free” service that allows Chinese tourists to prepay for their duty-free purchases before going on vacation. Tmall Global, a platform under Alibaba Group Holding Limited (NYSE: BABA), also announced that Thailand’s largest duty-free retail group, King Power, will open a duty-free storefront on the platform (http://kingpowerdutyfree.tmall.hk/) and beco