> ## Documentation Index
> Fetch the complete documentation index at: https://docs.lobbystack.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Cancel an appointment

> Cancelling an appointment that is already cancelled returns it unchanged.



## OpenAPI

````yaml /api-reference/openapi.json post /appointments/{appointment_id}/cancel
openapi: 3.1.0
info:
  title: LobbyStack API
  version: v1
  description: >-
    Read calls, contacts, appointments and messages, book appointments, and
    subscribe to webhooks. Authenticate with an API key in the Authorization
    header. Each key allows 120 requests per minute by default.
servers:
  - url: https://app.lobbystack.com/api/v1
security:
  - bearerAuth: []
tags:
  - name: Business
  - name: Calls
  - name: Contacts
  - name: Appointments
  - name: Messages
  - name: Knowledge
  - name: Webhooks
paths:
  /appointments/{appointment_id}/cancel:
    post:
      tags:
        - Appointments
      summary: Cancel an appointment
      description: >-
        Cancelling an appointment that is already cancelled returns it
        unchanged.
      operationId: cancelAppointment
      parameters:
        - name: appointment_id
          in: path
          required: true
          description: The appointment id.
          schema:
            type: string
            format: uuid
      responses:
        '200':
          description: OK
          content:
            application/json:
              schema:
                type: object
                required:
                  - data
                properties:
                  data:
                    $ref: '#/components/schemas/Appointment'
        '400':
          description: The request is invalid (invalid_request).
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '401':
          description: The API key is missing, invalid, or revoked (unauthorized).
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '403':
          description: The API key lacks the appointments:write scope (insufficient_scope).
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '404':
          description: Not found (not_found).
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '409':
          description: The request conflicts with the current state.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '429':
          description: >-
            Too many requests (rate_limited). Wait for the Retry-After header's
            number of seconds.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
          headers:
            Retry-After:
              schema:
                type: integer
              description: Seconds to wait.
      security:
        - bearerAuth: []
components:
  schemas:
    Appointment:
      type: object
      properties:
        id:
          description: Stable identifier (UUID).
          type: string
          format: uuid
        status:
          type: string
          enum:
            - confirmed
            - cancelled
        starts_at:
          description: ISO 8601 timestamp in UTC.
          type: string
          format: date-time
        ends_at:
          description: ISO 8601 timestamp in UTC.
          type: string
          format: date-time
        timezone:
          type: string
        service_id:
          description: Stable identifier (UUID).
          type: string
          format: uuid
        service_name:
          type: string
        staff_id:
          description: Stable identifier (UUID).
          type: string
          format: uuid
        staff_name:
          type: string
        contact_id:
          description: Stable identifier (UUID).
          type: string
          format: uuid
        contact_name:
          anyOf:
            - type: string
            - type: 'null'
        contact_phone:
          anyOf:
            - type: string
            - type: 'null'
        source:
          description: >-
            Where the booking came from, for example voice, web_chat, dashboard
            or api.
          type: string
        calendar_sync_status:
          type: string
          enum:
            - pending
            - synced
            - failed
            - not_required
        created_at:
          description: ISO 8601 timestamp in UTC.
          type: string
          format: date-time
        updated_at:
          description: ISO 8601 timestamp in UTC.
          type: string
          format: date-time
      required:
        - id
        - status
        - starts_at
        - ends_at
        - timezone
        - service_id
        - service_name
        - staff_id
        - staff_name
        - contact_id
        - contact_name
        - contact_phone
        - source
        - calendar_sync_status
        - created_at
        - updated_at
      additionalProperties: false
    Error:
      type: object
      properties:
        error:
          type: object
          properties:
            code:
              type: string
              enum:
                - invalid_request
                - unauthorized
                - forbidden
                - insufficient_scope
                - not_found
                - conflict
                - idempotency_key_reused
                - idempotency_request_in_progress
                - booking_disabled
                - booking_requires_confirmation
                - slot_unavailable
                - rate_limited
                - rate_limit_unavailable
                - method_not_allowed
                - internal_error
            message:
              type: string
            details:
              type: array
              items:
                type: object
                properties:
                  path:
                    type: string
                  message:
                    type: string
                required:
                  - path
                  - message
                additionalProperties: false
          required:
            - code
            - message
          additionalProperties: false
      required:
        - error
      additionalProperties: false
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      description: >-
        An API key from Settings > API keys. Scopes: business:read,
        business:write, calls:read, contacts:read, contacts:write,
        appointments:read, appointments:write, messages:read, knowledge:write,
        webhooks:manage.

````