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. Marketplace.

At its Accelerate seller conference in Seattle on September 18, Amazon announced that its Multi-Channel Fulfillment (MCF) service will now handle picking, packing and delivery for third-party merchants selling their goods through Walmart and Shopify, and will expand to include Shein by the end of the year. Orders will arrive in unbranded packaging with tracking information, and sellers can choose from multiple carriers. 

MCF already works with platforms like eBay, Etsy, Temu and TikTok Shop, but this marks its biggest push yet to serve competitors’ marketplaces.

"By working with Shein, Shopify and Walmart, we're making it easier for sellers — especially the small and medium-sized businesses that drive our economy— to use our network to grow faster and more efficiently across their sales channels," Amazon vice-president of multichannel fulfillment and commerce Peter Larsen said.

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. The company claims sellers using MCF have reported a 19% increase in sales or revenue on average, and have improved inventory turnover by 12%.