> ## Documentation Index > Fetch the complete documentation index at: https://cal.id/docs/llms.txt > Use this file to discover all available pages before exploring further. # Confirm or decline a booking > Change booking confirmation status (accept or decline) ## OpenAPI ````yaml /openapi.json patch /booking/{id}/change_confirmation openapi: 3.1.0 info: title: Cal ID API description: >- API documentation for external developers integrating with Cal ID. This documentation is auto-generated from our OpenAPI specification and includes details on all available endpoints, request/response schemas, and authentication methods. Authentication is required for all endpoints and can be done using API key generated from the Cal ID dashboard under the `settings/developer/api-keys` page. Use the Authorization header with the Bearer scheme to authenticate your requests. Example: - API Key: `Authorization: Bearer calid_xxxxx` Note: To manage Team's resources use the Team's owner/admin API key version: 1.0.0 contact: name: API Support email: support@cal.id url: https://cal.id license: name: MIT url: https://opensource.org/licenses/MIT servers: - url: https://api.cal.id description: 'Production server ' security: - bearerAuth: [] tags: - name: Health description: Health check endpoints - name: Users description: User management endpoints - name: Event Types description: Event type management endpoints - name: Teams description: Team management endpoints - name: Team Event Types description: Event type management endpoints for teams - name: Team Memberships description: Membership management endpoints for teams - name: Team Schedules description: Schedule management endpoints for teams - name: Availability description: User availability management endpoints - name: Schedule description: User schedule management endpoints - name: Slots description: Available slots retrieval endpoints - name: Booking description: Event booking endpoints paths: /booking/{id}/change_confirmation: patch: tags: - Booking summary: Confirm or decline a booking description: Change booking confirmation status (accept or decline) operationId: change_booking_confirmation_status parameters: - schema: type: integer exclusiveMinimum: 0 example: 101 minimum: 1 in: path name: id required: true description: Numeric booking identifier. requestBody: content: application/json: schema: type: object properties: confirmed: type: boolean description: >- Whether the booking is accepted (`true`) or declined (`false`). example: true recurringEventId: default: null description: Optional recurring event instance identifier. example: rec_evt_123 type: string nullable: true reason: type: string description: Optional reason for declining or accepting. example: Host is unavailable required: - confirmed additionalProperties: false example: confirmed: true required: true responses: '200': description: Booking status changed content: application/json: schema: type: object properties: success: type: boolean enum: - true data: type: object properties: message: type: string status: type: string bookingId: type: number required: - message - status - bookingId additionalProperties: false message: type: string meta: type: object properties: pagination: type: object properties: page: type: number limit: type: number total: type: number totalPages: type: number required: - page - limit - total - totalPages additionalProperties: false additionalProperties: {} required: - success additionalProperties: false description: Booking status changed '400': description: Bad Request content: application/json: schema: type: object properties: success: type: boolean enum: - false message: type: string error: type: object properties: code: type: string message: type: string details: {} required: - code - message additionalProperties: false required: - success - message - error additionalProperties: false description: Bad Request '401': description: Unauthorized content: application/json: schema: type: object properties: success: type: boolean enum: - false message: type: string error: type: object properties: code: type: string message: type: string details: {} required: - code - message additionalProperties: false required: - success - message - error additionalProperties: false description: Unauthorized '404': description: Booking not found or invalid credentials content: application/json: schema: type: object properties: success: type: boolean enum: - false message: type: string error: type: object properties: code: type: string message: type: string details: {} required: - code - message additionalProperties: false required: - success - message - error additionalProperties: false description: Booking not found or invalid credentials security: - bearerAuth: [] components: securitySchemes: bearerAuth: type: http scheme: bearer bearerFormat: JWT | API Key description: |- Use the Authorization header with Bearer scheme. Examples: - API Key: Authorization: Bearer calid_xxxxx ```` ## Related topics - [Webhook in Cal ID](/docs/developers/webhooks.md) - [How to Set Up Requires Confirmation for a Booking?](/docs/event-types/advanced/requires-confirmation.md) - [Verify Email on Booking Page before the Booking](/docs/event-types/booking-questions/verify-email.md) - [Disable Default Attendee Confirmation Emails in Cal ID](/docs/event-types/advanced/disable-confirmation-emails.md) - [Booking Success URL](/docs/event-types/advanced/success-url.md)