Is there an open-source order management system I can extend?
- Type
- Applies to
- Medusa v2.x
- Updated
Short answer
Yes. Medusa's MIT-licensed core is a commerce platform that works as an extensible open-source order management system. It natively handles multi-channel order capture, draft orders, order edits, returns, exchanges, claims, location-based stock reservation and fulfillment providers. You extend it with TypeScript workflows, subscribers and modules. Replenishment, purchasing and warehouse management need custom code or an ERP.
How Medusa works as an open-source order management system
Medusa is an open-source commerce platform, MIT-licensed apart from its Enterprise Edition RBAC and SSO features, whose commerce modules cover the core of an order management system (OMS). An OMS is the system that captures orders from every sales channel, decides where each order ships from, and tracks it through fulfillment, returns and refunds. In Medusa, that job is split across the Order, Inventory, Stock Location, Sales Channel, Fulfillment and Payment modules.
Medusa's OMS recipe describes this setup: storefronts and other channels send orders into Medusa, stock is reserved at a location, and fulfillment and payment run through provider modules. Because Medusa is a headless backend with a framework for customization, you change how orders are captured, routed or synced in your own TypeScript code instead of waiting on a vendor roadmap.
Which OMS capabilities does Medusa cover?
Medusa's OMS capabilities map to common order management terms as follows. Native means it ships in Medusa core, Official guide means the docs include a guide with example code, and Custom means you build it.
How do you extend Medusa's order flows?
Medusa's framework gives you four main extension points for order management. Each one runs inside the same application as the commerce modules, so custom logic and core data share one database and one deployment.
- Subscribers run code when an event fires, such as Copy to clipboard
order.placed, Copy to clipboardorder.fulfillment_createdor Copy to clipboardorder.return_requested. Use them to push orders to a 3PL or ERP. See events and subscribers and the order events reference. - Workflows chain steps with compensation, so a failed call to an external system rolls back earlier steps. See workflows.
- Module providers plug carriers and payment services into the Fulfillment and Payment modules. See create a fulfillment module provider.
- Custom modules and API routes add data that Medusa doesn't model, such as routing rules or warehouse priorities, and expose it to your apps.
Example: Makro PRO uses Medusa for order orchestration
Makro PRO, the online platform of Thai wholesaler CP Axtra (the Makro chain, called Siam Makro in Medusa's OMS recipe), uses Medusa as the central hub for order orchestration. According to Medusa's 2023 case study, the setup processes more than 5,000 orders per day, dispatched from over 100 stores across Thailand.
Orders are registered in Medusa and split by fulfillment type. First-party orders go to a custom system that coordinates fulfillment across Makro stores, and third-party orders go to Mirakl, which manages Makro's seller network. The team built a webhook-based plugin so external systems update order statuses in Medusa, which customer support uses as the single order overview.
How does Medusa compare with Odoo and closed OMS vendors?
Medusa, Odoo and closed-source OMS products solve overlapping problems from different starting points. Odoo is an ERP suite, closed OMS vendors sell routing and orchestration as a hosted product, and Medusa is a commerce backend you extend in code.
When Medusa is not the right choice for an OMS
Medusa is a weaker fit when you need warehouse and purchasing features on day one. Purchase orders, reorder points, bin locations and stock transfers aren't part of Medusa core, so a team without developers is better served by an ERP such as Odoo, or by keeping the ERP as the stock master and syncing it with Medusa.
A dedicated OMS product can also fit better when business users need to edit routing rules in a UI without any code, and you don't need control over the source.
Common questions
Can Medusa be used only as an OMS behind another storefront or checkout?
Yes. Medusa's OMS recipe describes importing orders from a third-party checkout through a custom API route or a scheduled job. You build that import yourself, since Medusa has no built-in order importer.
Does Medusa route orders to the nearest warehouse automatically?
No. Medusa reserves stock at the stock location linked to the order's sales channel, and staff can choose another location when they create a fulfillment. Rules such as nearest store or split shipments need a custom workflow.
Does Medusa support returns, exchanges and claims?
Yes. Medusa's Order Module supports returns, exchanges, claims and order edits as order changes, and the Medusa Admin has screens for each. Returned items can be received back into a chosen stock location.
Is Medusa an alternative to Odoo for order management?
Partly. Medusa covers order capture, fulfillment and returns for commerce channels, while Odoo is an ERP with purchasing, replenishment and inter-warehouse transfers. Many teams pair Medusa with an ERP for stock planning.