Integrate your custom platform with our REST API

3PL Fusion has a fully supported REST API, allowing you to integrate any platform, including your own bespoke solution.

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What is the 3PL Fusion API?

3PL Fusion exposes a full REST API for customers that need deeper integration with their beposke backend platforms, or where a platform integration is not supported out of the box. The API supports six core functional areas:

Products

The API provides functionality to create, read (view), update, and delete products from the database, together with managing the barcodes applied to the products. Additionally, warehouse stock and a stock breakdown can be retrieved directly.

GRNs

Goods Received Notes (GRNs) can be created, read (viewed), updated, and deleted via the API, ensuring that stock is accurately moved between business platforms.

Orders

Together with creating, viewing, updating, and deleting orders, you can additionally create special orders, cancel (rather than delete) an order, set special conditions, and create shipping labels.

Returns

Create returns from your customer back to 3PL and view the live status of inbound returns.

Utilities

Allows you to view currencies, deliver notes, Dangerous Goods Note (DGN) types, DGN details, countries, and special delivery services.

Reports

View complete stock adjustments and the unique serial numbers of all goods.

Explore the API on Postman

Full documentation and sample code for the 3PL Fusion API are published via the Postman portal.

Explore API

3pl Fusion API Frequently Asked Questions

Is the API secured?

Yes, for the API Endpoint to work, you will be required to enter your API-KEY into the api_key variable.

Is the API REST-compliant?

Yes. The 3PL Fusion API follows REST principles, using standard HTTP methods such as GET, POST, PUT, and DELETE. Responses are returned in JSON format.

What data format does the API use?

Requests and responses can use JSON (JavaScript Object Notation) or regular form data. Make sure your application sends Content-Type: application/json headers when making requests.

How do I authenticate with the API?

Authentication is completed via an API key, passed in the request headers. The common format is: Authorization: Bearer <your_token>.

Does the API have rate limits?

Yes. To ensure stability, rate limits apply. Exceeding the limit will return a 429 Too Many Requests response. The exact thresholds are listed in the documentation.

What environments are available?

The API provides both a production environment for live data and a sandbox environment for testing and development.

Can I filter or paginate results?

Yes. Most list endpoints support filtering and pagination through query parameters, so you can retrieve only the data you need.

Is versioning supported?

Yes. The 3PL Fusion API supports versioning to maintain backward compatibility. Versions are usually included in the URL path, for example,/api/v1/.

How do I report issues or request support?

You can raise issues or request assistance through the official support channels listed in the documentation, or by contacting the technical support team directly.

6 reasons to choose 3PL

There are an estimated 13,000 fulfilment companies in the UK alone! In such a competitive landscape, what truly sets us apart from the rest, and why do brands join and stick with 3PL?

People-first approach

We’re not a faceless tech platform, we’re real people who care about you and your brand. We understand that your business is precious and unique, meaning you don’t always fit the cookie-cutter mould.

100% service guarantee

We guarantee to pick and pack your orders 100% correctly, 100% of the time. If we get it wrong, then we fix the problem extremely quickly, on our time and at our expense – not yours!

Seamless integration

Whether you’re selling on Shopify, Amazon, or are a multichannel business with a complex ERP, our in-house tech team ensures our platforms are connected and working seamlessly.

Extended cut-off times

Speed matters, as does carrier partnerships. With same-day dispatch available up to 9pm, you can significantly extend your sales cut-off times and outperform your competitors.

HMRC FHDDS accredited

We’re officially Fulfilment House Due Diligence Scheme licensed and accredited to provide fulfilment services in the UK, assurances that we pass on to you as a 3PL customer.

Digital recording of every order

Every single order we dispatch is recorded using our Hawkeye system, whether that’s an item, box, or pallet. We can then provide you with dispatch evidence, if this differs from what the customer thinks they received!