Magento Fulfillment, Explained for Magento and Adobe Commerce Stores

Magento fulfillment is the work of getting orders placed on a Magento Open Source or Adobe Commerce store to the customer: storing the inventory, receiving each order, picking and packing it, shipping it, and writing the shipment and tracking number back to the order in Magento. A store can run it in-house or hand it to a 3PL.

Magento records orders, invoices, shipments, and stock, but it does not store or ship anything. The physical work happens on a shelf somewhere, either your own or a fulfillment partner's. Pairing the store with a 3PL means the back end keeps up with the front end: orders flow to the warehouse, inventory stays accurate, and customers get tracking without manual work.

Magento Open Source and Adobe Commerce share the same core. Open Source is the free edition that merchants host themselves; Adobe Commerce is the licensed edition, available on premises or as a cloud service run by Adobe, with extra features on top. For fulfillment the order flow is the same in both, so a 3PL that works with one generally works with the other.

How Multi-Source Inventory Fits a 3PL

Magento's Inventory Management, formerly called Multi-Source Inventory or MSI, is installed by default in both editions. It uses a few terms worth knowing. A source is a physical location that holds stock. A stock links one or more sales channels, meaning your Magento websites, to one or more sources. Salable quantity is what a sales channel can sell: the stock held across the sources assigned to its stock, minus open reservations.

When a customer places an order, Magento records a reservation that lowers the salable quantity straight away, before anything leaves a shelf. The reservation clears once the order ships and the source quantity is updated. In a typical 3PL setup the warehouse is treated as a source, and the counts it reports back are what keep that source honest. If you also hold stock somewhere else, such as a retail store or your own back room, each location is its own source and Magento can add them together.

How a Magento Store Connects to a 3PL

In general, Magento and 3PL integrations run through Magento's API, an extension installed in the store, or a middleware service that sits between the two. The method and how often data moves differ from one provider to the next, so it is a fair question to ask any 3PL which one it uses for your version and hosting.

Whatever the connection, the jobs are the same: send paid orders to the warehouse, send shipments and tracking numbers back, and keep stock levels in step. Custom attributes, heavily modified checkouts, and multi-website setups are where Magento integrations usually need the most testing, because Magento stores are often customized far more than stores on hosted platforms.