Shein wants to build supply chain giant, some fear China cyber spying [Video]

The rise of Asian fast fashion retailer Shein already has Amazon on alert, but its plans of selling proprietary supply-chain technology and services to companies around the world has attracted attention from another corner: U.S. cybersecurity firms and national security experts who warn of the potential for a company with close ties to China spying on the supply chain as it seeks to grow its global logistics footprint.

Shein logistics software is in beta testing with select supply chain customers, according to a person familiar with its plans.

The U.S. supply chain has millions of connection points that link companies of all sizes. What makes the connections hum are application programming interfaces, or APIs, used by companies to increase efficiencies and save money. API software allows applications …