lexoffice

lexoffice Files API

File upload and download for voucher receipts.

Documentation GitHub OpenAPI

Operations 2

POST /files Upload a file #

GET /files/{id} Download a file #

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OpenAPI Specification

openapi: 3.2.0
info:
  title: lexoffice (lexware Office) Public Files API
  description: Public REST API for lexoffice, the German cloud accounting and invoicing SaaS from Lexware (Haufe Group), rebranded to "lexware Office" in 2025.
  version: '1.0'
  contact:
    name: lexware Office Developers
    url: https://developers.lexware.io/docs/
  license:
    name: Proprietary
    url: https://www.lexware.de/
servers:
- url: https://api.lexware.io/v1
  description: Lexware API gateway (current)
- url: https://api.lexoffice.io/v1
  description: Legacy lexoffice API gateway (retired end of 2025)
security:
- bearerAuth: []
tags:
- name: Files
  description: File upload and download for voucher receipts.
paths:
  /files:
    post:
      operationId: uploadFile
      tags:
      - Files
      summary: Upload a file
      description: Uploads a receipt file (PDF, JPG, or PNG) to be attached to a voucher. Sent as multipart/form-data with a file part and a type of "voucher".
      requestBody:
        required: true
        content:
          multipart/form-data:
            schema:
              type: object
              properties:
                file:
                  type: string
                  format: binary
                type:
                  type: string
                  example: voucher
      responses:
        '200':
          description: Reference to the uploaded file.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ResourceReference'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '406':
          description: Unsupported media type or file too large.
  /files/{id}:
    parameters:
    - $ref: '#/components/parameters/Id'
    get:
      operationId: downloadFile
      tags:
      - Files
      summary: Download a file
      description: Downloads a previously uploaded or rendered file by its UUID.
      responses:
        '200':
          description: The binary file.
          content:
            application/pdf:
              schema:
                type: string
                format: binary
            image/jpeg:
              schema:
                type: string
                format: binary
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
components:
  schemas:
    Error:
      type: object
      properties:
        timestamp:
          type: string
          format: date-time
        status:
          type: integer
        error:
          type: string
        path:
          type: string
        message:
          type: string
        details:
          type: array
          items:
            type: object
            properties:
              violation:
                type: string
              field:
                type: string
              message:
                type: string
    ResourceReference:
      type: object
      properties:
        id:
          type: string
          format: uuid
        resourceUri:
          type: string
          format: uri
        createdDate:
          type: string
          format: date-time
        updatedDate:
          type: string
          format: date-time
        version:
          type: integer
  responses:
    NotFound:
      description: The requested resource was not found.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
    Unauthorized:
      description: Missing or invalid Bearer API key.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
  parameters:
    Id:
      name: id
      in: path
      required: true
      description: The UUID of the resource.
      schema:
        type: string
        format: uuid
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      description: 'Bearer API key generated by the account owner at https://app.lexware.de/addons/public-api and passed as `Authorization: Bearer YOUR_API_KEY`.'