openapi: 3.0.3
info:
  title: Fulfil REST API (v2) Authentication API
  description: 'Fulfil is a cloud ERP and operations platform for e-commerce, DTC, and wholesale merchants. Its REST API (v2) exposes every ERP resource through a single, uniform "model interface": each business object (sales orders, products, stock moves, parties, shipments, purchases, production, and thousands more) is a named model addressed at `/api/v2/model/{model.name}`, with generic CRUD, a `search_read` search, `count`, and the ability to call arbitrary model methods (actions), run reports, and drive wizards. Fulfil advertises 6,000+ endpoints across all models.

    The base URL is per-merchant: `https://{merchant_id}.fulfil.io/api/v2`. Authentication is either a personal access token sent in the `X-API-KEY` header (or as HTTP Basic) for private integrations, or OAuth 2.0 for public apps. Use `GET /api/v2/test` to verify credentials.

    Fulfil records are model-specific and dynamically typed, so request and response bodies below are represented as open JSON objects (a `Record` is an object with an integer `id` plus arbitrary model fields). This document models the generic interface plus concrete headline models; the same interface applies to any other Fulfil model by substituting its name.'
  version: '2.0'
  contact:
    name: Fulfil Developer Documentation
    url: https://developers.fulfil.io/
  license:
    name: Proprietary
    url: https://www.fulfil.io/
servers:
- url: https://{merchant_id}.fulfil.io/api/v2
  description: Fulfil merchant instance
  variables:
    merchant_id:
      default: mystore
      description: Your Fulfil merchant subdomain.
security:
- apiKeyAuth: []
- oauth2: []
tags:
- name: Authentication
  description: Verify API credentials.
paths:
  /test:
    get:
      operationId: testCredentials
      tags:
      - Authentication
      summary: Test API credentials
      description: Verifies that the supplied API key or token is valid.
      responses:
        '200':
          description: Credentials are valid.
        '401':
          $ref: '#/components/responses/Unauthorized'
components:
  schemas:
    Error:
      type: object
      properties:
        type:
          type: string
        message:
          type: string
        code:
          type: integer
  responses:
    Unauthorized:
      description: Missing or invalid credentials.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
  securitySchemes:
    apiKeyAuth:
      type: apiKey
      in: header
      name: X-API-KEY
      description: Personal access token for private integrations, sent in the X-API-KEY header. Fulfil also accepts the token via HTTP Basic authentication.
    oauth2:
      type: oauth2
      description: OAuth 2.0 authorization code flow for public apps.
      flows:
        authorizationCode:
          authorizationUrl: https://{merchant_id}.fulfil.io/oauth/authorize
          tokenUrl: https://{merchant_id}.fulfil.io/oauth/token
          scopes: {}