Amazon's third-party logistics arm is opening up its vast delivery network to more online sellers, with plans to fulfill online orders for Walmart Marketplace, Shopify and Shein's U.S. For Walmart Marketplace sellers, Amazon is rolling out new integration tools to link Walmart Marketplace orders directly to MCF. Shopify merchants can also connect their stores to Amazon and track inventory, orders and delivery performance from inside Shopify. And for Shein’s U.S. marketplace, Amazon plans to launch a dedicated “Amazon MCF for Shein” app for its sellers to use later this year. Amazon says using a single inventory pool across platforms helps sellers avoid running out of stock and fulfill orders faster.