Chinese retailers that sell on Shein and PDD Holdings Inc.’s Temu platform say they have been asked by logistics agents to start paying an additional 30% levy after President Donald Trump earlier this week hiked tariffs on goods imported to the US from China and Hong Kong.

Mr Trump’s new trade barriers will be a blow not only to American consumers, but also to the e-commerce companies that have cashed in on the de minimis exemption. Shein, a Chinese apparel group whose largest market is America,