openapi: 3.0.1
info:
  title: Cronofy Availability Events API
  description: The Cronofy API is a REST interface for embedding scheduling and calendar functionality into applications. It provides a unified abstraction over Google Calendar, Microsoft 365 / Outlook, Exchange, and Apple iCloud, covering connected calendars, two-way event sync, free/busy and availability querying, real-time scheduling pages, smart invites, and push notification channels. All requests are authenticated with an OAuth 2.0 Bearer access token.
  termsOfService: https://www.cronofy.com/legal/terms
  contact:
    name: Cronofy Support
    url: https://docs.cronofy.com/developers/
    email: support@cronofy.com
  version: '1.0'
servers:
- url: https://api.cronofy.com/v1
  description: United States data center (default)
- url: https://api-uk.cronofy.com/v1
  description: United Kingdom data center
- url: https://api-de.cronofy.com/v1
  description: Germany data center
- url: https://api-au.cronofy.com/v1
  description: Australia data center
- url: https://api-ca.cronofy.com/v1
  description: Canada data center
- url: https://api-sg.cronofy.com/v1
  description: Singapore data center
security:
- bearerAuth: []
tags:
- name: Events
  description: Reading, creating, updating, and deleting events plus free/busy.
paths:
  /events:
    get:
      operationId: readEvents
      tags:
      - Events
      summary: Read events
      description: Returns a paged list of events across all of a user's connected calendars within the requested period.
      parameters:
      - name: from
        in: query
        schema:
          type: string
          format: date
        description: The minimum date (inclusive) from which to return events.
      - name: to
        in: query
        schema:
          type: string
          format: date
        description: The maximum date (exclusive) up to which to return events.
      - name: tzid
        in: query
        required: true
        schema:
          type: string
        description: The time zone id used to interpret and return event times, e.g. Etc/UTC.
      - name: calendar_ids[]
        in: query
        schema:
          type: array
          items:
            type: string
        description: Restrict results to the given calendar ids.
      - name: last_modified
        in: query
        schema:
          type: string
          format: date-time
        description: Only return events modified since this timestamp.
      responses:
        '200':
          description: OK
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/EventList'
        '401':
          $ref: '#/components/responses/Unauthorized'
  /free_busy:
    get:
      operationId: readFreeBusy
      tags:
      - Events
      summary: Free/busy
      description: Returns free/busy information across all of a user's connected calendars without exposing event detail.
      parameters:
      - name: from
        in: query
        schema:
          type: string
          format: date
      - name: to
        in: query
        schema:
          type: string
          format: date
      - name: tzid
        in: query
        required: true
        schema:
          type: string
      - name: calendar_ids[]
        in: query
        schema:
          type: array
          items:
            type: string
      responses:
        '200':
          description: OK
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/FreeBusyList'
        '401':
          $ref: '#/components/responses/Unauthorized'
  /calendars/{calendar_id}/events:
    post:
      operationId: upsertEvent
      tags:
      - Events
      summary: Create or update event
      description: Creates or updates an event within the specified calendar, keyed on the caller-supplied event_id.
      parameters:
      - $ref: '#/components/parameters/CalendarId'
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/UpsertEventRequest'
      responses:
        '202':
          description: Accepted - the event has been queued for creation or update.
        '401':
          $ref: '#/components/responses/Unauthorized'
        '422':
          $ref: '#/components/responses/UnprocessableEntity'
    delete:
      operationId: deleteEvent
      tags:
      - Events
      summary: Delete event
      description: Deletes an event, identified by event_id, from the specified calendar.
      parameters:
      - $ref: '#/components/parameters/CalendarId'
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/DeleteEventRequest'
      responses:
        '202':
          description: Accepted - the event has been queued for deletion.
        '401':
          $ref: '#/components/responses/Unauthorized'
        '422':
          $ref: '#/components/responses/UnprocessableEntity'
components:
  schemas:
    EventList:
      type: object
      properties:
        pages:
          $ref: '#/components/schemas/Pages'
        events:
          type: array
          items:
            $ref: '#/components/schemas/Event'
    DeleteEventRequest:
      type: object
      required:
      - event_id
      properties:
        event_id:
          type: string
          description: The caller-supplied identifier of the event to delete.
    Pages:
      type: object
      properties:
        current:
          type: integer
        total:
          type: integer
        next_page:
          type: string
    UpsertEventRequest:
      type: object
      required:
      - event_id
      - summary
      - start
      - end
      properties:
        event_id:
          type: string
          description: A caller-supplied identifier used to create or update the event idempotently.
        summary:
          type: string
        description:
          type: string
        start:
          type: string
          description: An RFC 3339 timestamp or a date for all-day events.
        end:
          type: string
        tzid:
          type: string
        location:
          type: object
          properties:
            description:
              type: string
        attendees:
          type: object
          properties:
            invite:
              type: array
              items:
                type: object
                properties:
                  email:
                    type: string
                    format: email
                  display_name:
                    type: string
        transparency:
          type: string
          enum:
          - opaque
          - transparent
    Attendee:
      type: object
      properties:
        email:
          type: string
          format: email
        display_name:
          type: string
        status:
          type: string
          enum:
          - needs_action
          - accepted
          - declined
          - tentative
    FreeBusyList:
      type: object
      properties:
        pages:
          $ref: '#/components/schemas/Pages'
        free_busy:
          type: array
          items:
            type: object
            properties:
              calendar_id:
                type: string
              start:
                type: string
              end:
                type: string
              free_busy_status:
                type: string
                enum:
                - free
                - tentative
                - busy
                - unavailable
    Error:
      type: object
      properties:
        errors:
          type: object
          additionalProperties: true
          description: A map of field names to arrays of error descriptions.
    Event:
      type: object
      properties:
        calendar_id:
          type: string
        event_uid:
          type: string
        summary:
          type: string
        description:
          type: string
        start:
          type: string
          description: An RFC 3339 timestamp or a date for all-day events.
        end:
          type: string
        location:
          type: object
          properties:
            description:
              type: string
        deleted:
          type: boolean
        free_busy_status:
          type: string
          enum:
          - free
          - tentative
          - busy
          - unavailable
        attendees:
          type: array
          items:
            $ref: '#/components/schemas/Attendee'
  responses:
    Unauthorized:
      description: The access token is missing, invalid, or expired.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
    UnprocessableEntity:
      description: The request was well-formed but contained invalid parameters.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
  parameters:
    CalendarId:
      name: calendar_id
      in: path
      required: true
      schema:
        type: string
      description: The Cronofy id of the target calendar.
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      description: OAuth 2.0 access token passed as an Authorization Bearer header.