Fyndiq Orders API

openapi: 3.2.0
info:
  title: Fyndiq Merchant Articles Orders API
  version: v1
  description: The Fyndiq Merchant API enables merchants to upload and manage products (articles) and to retrieve and fulfil orders on the Fyndiq marketplace, Sweden's largest marketplace for bargains. The API is REST-oriented, uses JSON request and response bodies, and is protected with HTTP Basic Authentication (Base64-encoded `merchantID:token`). A self-contained sandbox environment mirrors production for integration testing.
  contact:
    name: Fyndiq Merchant Help Center
    url: https://support.fyndiq.se/hc/
  x-provenance:
    generated: '2026-07-19'
    method: derived
    source: https://merchantapi.fyndiq.com (public Postman collection 2328684/7185ENK)
    note: Faithfully reconstructed from Fyndiq's published Merchant API Postman documentation. Schemas reflect the documented request/response examples; Fyndiq does not publish an OpenAPI document.
servers:
- url: https://merchants-api.fyndiq.se/api/v1
  description: Production
- url: https://merchants-api.sandbox.fyndiq.se/api/v1
  description: Sandbox (credentials provided on request)
security:
- basicAuth: []
tags:
- name: Orders
  description: Retrieve, fulfil and cancel marketplace orders.
paths:
  /orders:
    get:
      operationId: listOrders
      tags:
      - Orders
      summary: List orders
      description: Retrieve your order data. The `state` field supports filtering; by default new orders are returned.
      parameters:
      - name: state
        in: query
        required: false
        schema:
          type: string
          enum:
          - CREATED
          - FULFILLED
          - CANCELLED
        description: Filter orders by state.
      responses:
        '200':
          description: OK
          content:
            application/json:
              schema:
                type: array
                items:
                  $ref: '#/components/schemas/Order'
    post:
      operationId: createTestOrder
      tags:
      - Orders
      summary: Create a test order
      description: Create a test order in the sandbox. This endpoint is NOT available in the production environment.
      responses:
        '200':
          description: Order was created
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/CreatedResponse'
  /orders/{order_id}:
    parameters:
    - name: order_id
      in: path
      required: true
      schema:
        type: string
      description: Fyndiq unique ID for the order.
    get:
      operationId: retrieveOrder
      tags:
      - Orders
      summary: Retrieve an order
      responses:
        '200':
          description: OK
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Order'
  /orders/{order_id}/fulfill:
    parameters:
    - name: order_id
      in: path
      required: true
      schema:
        type: string
    put:
      operationId: fulfillOrder
      tags:
      - Orders
      summary: Fulfil an order
      description: Mark the order as handled once you have shipped the item; include tracking information.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              properties:
                tracking_information:
                  type: array
                  items:
                    $ref: '#/components/schemas/TrackingInformation'
      responses:
        '202':
          description: Order row was fulfilled
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Message'
        '403':
          description: Order cannot be fulfilled (already fulfilled/cancelled or past deadline)
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Message'
  /orders/{order_id}/cancel:
    parameters:
    - name: order_id
      in: path
      required: true
      schema:
        type: string
    put:
      operationId: cancelOrder
      tags:
      - Orders
      summary: Cancel an order
      description: Cancel an order when you are unable to ship the item (e.g. stock issue).
      responses:
        '202':
          description: Order row was cancelled
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Message'
        '403':
          description: Order cannot be cancelled (already fulfilled/cancelled)
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Message'
components:
  schemas:
    Message:
      type: object
      properties:
        description:
          type: string
    ShippingAddress:
      type: object
      properties:
        first_name:
          type: string
        last_name:
          type: string
        street_address:
          type: string
        city:
          type: string
        postal_code:
          type: string
        country:
          type: string
        phone_number:
          type: string
    Order:
      type: object
      properties:
        id:
          type: string
        article_id:
          type: string
        title:
          type: string
        article_sku:
          type: string
        price:
          $ref: '#/components/schemas/OrderMoney'
        total_price:
          $ref: '#/components/schemas/OrderMoney'
        quantity:
          type: integer
        shipping_address:
          $ref: '#/components/schemas/ShippingAddress'
        market:
          type: string
          example: SE
        state:
          type: string
          example: CREATED
        created_at:
          type: string
        updated_at:
          type: string
        fulfillment_deadline:
          type: string
        tracking_information:
          type: array
          items:
            $ref: '#/components/schemas/TrackingInformation'
    OrderMoney:
      type: object
      properties:
        amount:
          type: number
        vat_amount:
          type: number
        vat_rate:
          type: number
        currency:
          type: string
          example: SEK
    CreatedResponse:
      type: object
      properties:
        id:
          type: string
        description:
          type: string
          example: Article was created.
    TrackingInformation:
      type: object
      properties:
        carrier_name:
          type: string
          example: Postnord
        tracking_number:
          type: string
  securitySchemes:
    basicAuth:
      type: http
      scheme: basic
      description: Base64-encoded `merchantID:token`.