openapi: 3.0.3
info:
  title: sevdesk CheckAccount Contact API
  description: 'The sevdesk API is a RESTful interface to the sevdesk cloud accounting and invoicing platform. Every function and every piece of data available in the sevdesk web application can also be driven through this API - contacts, invoices, orders, credit notes, vouchers (receipts), bank check accounts and transactions, parts (inventory), and tags. All requests are authenticated with a per-administrator API token, passed as the value of an `Authorization` header. Nested resources can be pulled in with the `embed` query parameter.


    This OpenAPI document is a grounded, representative subset authored by API Evangelist from sevdesk''s official OpenAPI specification (openapi 3.0.0, reported API version 2.0.0, served at https://my.sevdesk.de/api/v1). The paths, HTTP methods, operationIds, and the apiKey security scheme are taken directly from the official specification; request and response schemas here are simplified representations of the far richer official models. See review.yml for confirmed-vs-modeled detail.'
  version: '1.0'
  contact:
    name: sevdesk
    url: https://api.sevdesk.de/
servers:
- url: https://my.sevdesk.de/api/v1
  description: sevdesk main application instance
security:
- api_key: []
tags:
- name: Contact
  description: Contacts - customers, suppliers, and other business partners.
paths:
  /Contact:
    get:
      operationId: getContacts
      tags:
      - Contact
      summary: Retrieve contacts
      description: Retrieves a list of contacts, optionally filtered and embedded.
      parameters:
      - $ref: '#/components/parameters/Limit'
      - $ref: '#/components/parameters/Offset'
      - $ref: '#/components/parameters/Embed'
      responses:
        '200':
          description: A list of contacts.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ObjectList'
        '401':
          $ref: '#/components/responses/Unauthorized'
    post:
      operationId: createContact
      tags:
      - Contact
      summary: Create a new contact
      description: Creates a new contact (organisation or person).
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/Contact'
      responses:
        '201':
          description: The created contact.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ObjectResponse'
        '401':
          $ref: '#/components/responses/Unauthorized'
  /Contact/{contactId}:
    parameters:
    - $ref: '#/components/parameters/ContactId'
    get:
      operationId: getContactById
      tags:
      - Contact
      summary: Find contact by ID
      description: Retrieves a single contact by its ID.
      responses:
        '200':
          description: The requested contact.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ObjectResponse'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
    put:
      operationId: updateContact
      tags:
      - Contact
      summary: Update a existing contact
      description: Updates an existing contact.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/Contact'
      responses:
        '200':
          description: The updated contact.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ObjectResponse'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
    delete:
      operationId: deleteContact
      tags:
      - Contact
      summary: Deletes a contact
      description: Deletes a contact.
      responses:
        '200':
          description: Deletion confirmation.
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
  /Contact/Factory/getNextCustomerNumber:
    get:
      operationId: getNextCustomerNumber
      tags:
      - Contact
      summary: Get next free customer number
      description: Returns the next free customer number sevdesk would assign.
      responses:
        '200':
          description: The next free customer number.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ObjectResponse'
        '401':
          $ref: '#/components/responses/Unauthorized'
components:
  parameters:
    Embed:
      name: embed
      in: query
      required: false
      description: Comma-separated list of nested resources to embed fully in the response instead of returning only their id and objectName.
      schema:
        type: string
    ContactId:
      name: contactId
      in: path
      required: true
      description: The ID of the contact.
      schema:
        type: integer
    Limit:
      name: limit
      in: query
      required: false
      description: Limits the number of entries returned.
      schema:
        type: integer
    Offset:
      name: offset
      in: query
      required: false
      description: Number of entries to skip for pagination.
      schema:
        type: integer
  responses:
    Unauthorized:
      description: Missing or invalid API token.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
    NotFound:
      description: The requested resource was not found.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
  schemas:
    ObjectResponse:
      type: object
      description: Standard sevdesk single-object envelope.
      properties:
        objects:
          type: object
          additionalProperties: true
    Contact:
      type: object
      description: A sevdesk contact. Simplified subset of the official model; either name (organisation) or surname/familyname (person) is used together with a category.
      properties:
        name:
          type: string
          description: Organisation name (for company contacts).
        surename:
          type: string
          description: Given name (for person contacts).
        familyname:
          type: string
          description: Family name (for person contacts).
        customerNumber:
          type: string
        category:
          type: object
          description: Contact category reference (id + objectName Category).
          properties:
            id:
              type: integer
            objectName:
              type: string
      required:
      - category
    ObjectList:
      type: object
      description: Standard sevdesk list envelope. The objects array carries the requested resources.
      properties:
        objects:
          type: array
          items:
            type: object
            additionalProperties: true
    Error:
      type: object
      properties:
        error:
          type: object
          properties:
            message:
              type: string
            code:
              type: integer
  securitySchemes:
    api_key:
      type: apiKey
      name: Authorization
      in: header
      description: Per-administrator sevdesk API token - a 32-character hexadecimal string found in the sevdesk web app under user settings. Passed as the raw value of the `Authorization` header (no `Bearer` prefix). Tokens have an infinite lifetime.