openapi: 3.0.3
info:
  title: freee API (Accounting and HR/Payroll) Account Items Invoices API
  description: 'A representative, hand-authored subset of the public freee REST APIs for the freee Accounting product (会計freee) and the freee HR & Payroll product (人事労務freee). freee is a Japanese cloud accounting, invoicing, and HR / payroll SaaS. Accounting endpoints live under https://api.freee.co.jp/api/1 and HR / payroll endpoints under https://api.freee.co.jp/hr/api/v1. All requests are authenticated with an OAuth 2.0 (authorization code) access token sent as `Authorization: Bearer <access_token>`. Most reads and writes are scoped to a freee company via the `company_id` parameter. This document is grounded in freee''s own OpenAPI schemas (github.com/freee/freee-api-schema) but is a curated subset - it does not reproduce every operation, field, or response of the freee platform. See the official reference for the complete surface.'
  version: '2026-02-01'
  contact:
    name: freee Developers Community
    url: https://developer.freee.co.jp/
  license:
    name: © Since 2013 freee K.K.
    url: https://app.secure.freee.co.jp/developers/terms
servers:
- url: https://api.freee.co.jp
  description: freee production API host (accounting under /api/1, HR under /hr/api/v1)
security:
- oauth2:
  - read
  - write
tags:
- name: Invoices
  description: Issued invoices and quotations (請求書・見積書).
paths:
  /api/1/invoices:
    get:
      operationId: getInvoices
      tags:
      - Invoices
      summary: List invoices
      description: Lists issued invoices (請求書) for a company.
      parameters:
      - $ref: '#/components/parameters/CompanyIdQueryRequired'
      - $ref: '#/components/parameters/Offset'
      - $ref: '#/components/parameters/Limit'
      responses:
        '200':
          description: A list of invoices.
          content:
            application/json:
              schema:
                type: object
                properties:
                  invoices:
                    type: array
                    items:
                      $ref: '#/components/schemas/Invoice'
        '401':
          $ref: '#/components/responses/Unauthorized'
  /api/1/invoices/{id}:
    parameters:
    - $ref: '#/components/parameters/PathId'
    get:
      operationId: getInvoice
      tags:
      - Invoices
      summary: Get an invoice
      parameters:
      - $ref: '#/components/parameters/CompanyIdQueryRequired'
      responses:
        '200':
          description: The requested invoice.
          content:
            application/json:
              schema:
                type: object
                properties:
                  invoice:
                    $ref: '#/components/schemas/Invoice'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
  /api/1/quotations:
    get:
      operationId: getQuotations
      tags:
      - Invoices
      summary: List quotations
      description: Lists issued quotations / estimates (見積書) for a company.
      parameters:
      - $ref: '#/components/parameters/CompanyIdQueryRequired'
      responses:
        '200':
          description: A list of quotations.
          content:
            application/json:
              schema:
                type: object
                properties:
                  quotations:
                    type: array
                    items:
                      type: object
                      additionalProperties: true
        '401':
          $ref: '#/components/responses/Unauthorized'
components:
  responses:
    NotFound:
      description: The requested resource was not found.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
    Unauthorized:
      description: Missing or invalid OAuth 2.0 Bearer token.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
  schemas:
    Error:
      type: object
      properties:
        status_code:
          type: integer
        errors:
          type: array
          items:
            type: object
            properties:
              type:
                type: string
              messages:
                type: array
                items:
                  type: string
    Invoice:
      type: object
      properties:
        id:
          type: integer
        company_id:
          type: integer
        invoice_number:
          type: string
        issue_date:
          type: string
          format: date
        partner_id:
          type: integer
        total_amount:
          type: integer
        invoice_status:
          type: string
          description: Invoice lifecycle status (draft, applying, approved, submitted, unsubmitted).
  parameters:
    CompanyIdQueryRequired:
      name: company_id
      in: query
      required: true
      description: The freee company (事業所) ID the request is scoped to.
      schema:
        type: integer
    Offset:
      name: offset
      in: query
      required: false
      schema:
        type: integer
    Limit:
      name: limit
      in: query
      required: false
      schema:
        type: integer
        default: 20
    PathId:
      name: id
      in: path
      required: true
      description: The numeric identifier of the resource.
      schema:
        type: integer
  securitySchemes:
    oauth2:
      type: oauth2
      description: 'freee unified OAuth 2.0. Obtain an access token via the authorization code grant and send it as `Authorization: Bearer <access_token>` on every request. The same token works across freee products (accounting, HR/payroll, invoicing) subject to the granted scopes.'
      flows:
        authorizationCode:
          authorizationUrl: https://accounts.secure.freee.co.jp/public_api/authorize
          tokenUrl: https://accounts.secure.freee.co.jp/public_api/token
          scopes:
            read: データの読み取り (read data)
            write: データの書き込み (write data)