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Fulfillment Service Apps

Fulfillment service apps are integrations that manage fulfillment of physical products for merchants by enabling transparent communication between fulfillment providers and merchants using the 29 Next dashboard.


View a fully functional Demo Fulfillment Service App to see all of the concepts in action with detailed code examples.

Fulfillment Flow Overview

Below is a high-level overview of the fulfillment flow for fulfillment services to accept and process assigned fulfillment orders.

Fulfillment Flow Detail

Step 1 - New Order Created

All orders start with a customer creating a new order in the Checkout Flow, Admin API, or a recurring Subscription. Orders contain multiple Fulfillment Orders, each with the products allocated to the same Fulfillment Location that has the products in stock.

Step 2 - Store Creates a Fulfillment Request

After a delay period (usually several hours), the store will send a fulfillment request to the Fulfillment Location assigned to the order. Fulfillment Requests can be initiated by dashboard users, background processes, or via the Admin API. See Fulfillment Locations.

Step 3 - Fulfillment Service Retrieves Assigned Fulfillment Orders

In response to receiving a fulfillment request, the fulfillment service needs to retrieve all of their assigned fulfillment orders from the Assigned Fulfillment Orders API endpoint. See Assigned Fulfillment Orders.

Step 4 - Fulfillment Service Accepts Fulfillment Request

For each assigned fulfillment order request in Step 3, the fulfillment service needs to Accept or Reject the assignment to notify the store the order is expected to be fulfilled or not. See Accepting Fulfillment Requests.

Step 5 - Fulfillment Service Processes Fulfillment Order with Carrier

Accepted fulfillment orders are processed by the fulfillment service location to prepare shipment to the customer.

Step 6 - Fulfillment Service Creates a Fulfillment

Once an order has been fulfilled, the fulfillment service creates a fulfillment to upload with shipment carrier tracking information and notify the customer their order has shipped. See Creating Fulfillments.

Step 7 - Carrier Delivers Ordered Products to Customer

The carrier is responsible for delivering the products to the customer in this stage.

Fulfillment Orders

A Fulfillment Order represents items in an order that are to be fulfilled from the same location. A single order often contains multiple fulfillment orders, it's important to keep this in mind for your integration.

Fulfillment Locations

Fulfillment Services need to create Locations which represent their warehouses where physical products are stored and fulfilled from. Product stockrecords must be associated with a location for fulfillment.

When new orders are created, the fulfillment orders are assigned to the locations based on Fulfillment Routing. The Location Address is also used for Tax calculation. See the Locations Create endpoint to create a location.

Location Callback

The location callback is a URL the store will send Fulfillment Request webhooks to notify them of a new fulfillment assigned. Fulfillment Services need to query their Assigned Fulfillment Orders to retrieve the fulfillment order details.


Fulfullment Requests are sent to the location callback + /fulfillment-order-notification/.

Fulfillment assignment request types are:

  • fulfillment_requested - when a new fulfillment order has been requested to be fulfilled.
  • cancellation_requested- when an already processing fulfillment order has been requested to cancel fulfillment.
Example Fulfillment Request Payload
"type": "fulfillment_requested"

The webhook request has a X-29Next-Store header that indicates which store the request is from if you have a global callback url.

Assigned Fulfillment Orders

The Assigned Fulfillment Orders will return a list of all fulfillment orders assigned to your locations. Your app is recommended to call this API in response to receiving a notification to the location callback, and you may also want to poll this endpoint occasionally (ie once per hour) to ensure you've actioned everything requested.


Use the appropriate assignment_status parameter to filter the fulfillment orders to those that require action.

Retrieve all pending Fulfillment Requests

GET https://{store}

Requests to the location callback indicate the request type that should be passed to the Assigned Fulfillment Orders API as the assignment_status querystring value to filter fulfillment orders to those for the flow.

For example, to see new fulfillment requests pending acceptance, pass assignment_status=fulfillment_requested to the Assigned Fulfillment Orders API, fulfillment_requested was passed as type to the callback.

Accepting Fulfillment Requests

To Accept a Fulfillment Request assignment, send a POST request to the Fulfillment Request Accept Endpoint. The Fulfillment Order will show as Accepted in the dashboard and the Order will transition fulfillment_status to processing.

Example Fulfillment Accept Request
POST https://{store}{id}/fulfillment-request/accept/

Rejecting Fulfillment Requests

Your fulfillment service can Reject fulfillment order assignments which will prompt the merchant to take action in their store to amend the order. Rejecting fulfillment requests can be for many reasons, such as incorrectly assigned for unavailable products, no stock available, or invalid address. The Fulfillment Service should verify the order details before accepting, by rejecting the fulillment request it will prompt the merchant to correct the order and then send an updated fulfillment request. See possible rejection reasons on in the Fulfillment Request Reject API docs.

Example Fulfillment Rejection Payload
POST https://{store}{id}/fulfillment-request/reject/
"rejected_reason": "incorrect_address",
"message": "Your Message"

Cancellation Flow Overview

It is common for customers to contact merchants after orders have already been sent to fulfillment service partners for processing. Merchants have the ability to "Request Fulfillment Cancellation" which will send a cancellation_request to your Location Callback. Fulfillment Services are expected to respond to these requests.

Cancellation Flow Detail

Step 1 - Store Creates Cancellation Request

Merchants will trigger a cancellation request which will send a cancellation request to the Fulfillment Location assigned to the order.

Step 2 - Fulfillment Service Retrieves Cancellation Requests

In response to receiving a cancellation request, the fulfillment service needs to retrieve all of its assigned cancellation requests from the Assigned Fulfillment Orders API endpoint.

Retrieve all pending Cancellation Requests
GET https://{store}

Step 3 - Fulfillment Service Accepts/Rejects Cancellation Request

At this stage, the Fulfillment Service needs to Accept or Reject the cancellation request to respond to the merchant's request.

Accepting Cancellation Requests

To accept the cancellation request, send a request to the Cancellation Request Accept API.

Example Cancellation Accept Request
POST https://{store}{id}/cancellation-request/accept/

Rejecting Cancellation Requests

If an fulfillment order is too far along in fulfillment processing, fulfillment service partners can reject cancellation requests.

To reject a cancellation request, send a request to the Cancellation Request Reject API. If you include a message, it will show in the order timeline events for the merchant to see.

Example Cancellation Reject Request

POST https://{store}{id}/cancellation-request/reject/
"message": "Order already shipped."

Creating Fulfillments

Once you have tracking information for your the outgoing shipment to the customer, create a Fulfillment for the fulfillment order on the Fulfillments Create API.

Fulfillment Create Payload
POST https://{store}{id}/fulfillments/
"notify": true, // send the customer an order shipped notification email
"tracking_info": [
"tracking_code": "EXAMPLECODE",
"carrier": "dhl_ecommerce"

Sync Product Inventory

Products have "stock records" which represent the available physical stock at a fulfillment location. Often a single product can be stocked at multiple locations, with Fulfillment Routing governing the order fulfillment location assignment.

Retrieve Stock Records by Location

Fulfillment services can retrieve all stock records from a store to map with the SKUs at their warehouse. You can also search and filter by product name or SKU, see Admin API docs for stockrecordsRetrieve.

Retrieve Stock Records by Location
GET https://{store}{id}

With the list of stock records assigned to your location, you can now update the num_in_stock to reflect the current available units.

Update Number of Units In Stock

Fulfillment services are recommended to update the number in stock (num_in_stock) at regular intervals so that the store inventory is update to date and accurate.

Update Number of Units In Stock
PATCH https://{store}{id}/

"num_in_stock": 1000