Cronofy Calendars API

openapi: 3.0.1
info:
  title: Cronofy 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: Calendars
    description: Connected calendars, application calendars, and account identity.
  - name: Events
    description: Reading, creating, updating, and deleting events plus free/busy.
  - name: Availability
    description: Availability queries and hosted real-time scheduling.
  - name: Smart Invites
    description: Calendar invites tracked without calendar authorization.
  - name: Push Notifications
    description: Notification channels for real-time calendar changes.
paths:
  /userinfo:
    get:
      operationId: getUserInfo
      tags:
        - Calendars
      summary: Account identity
      description: Returns identity and profile information for the authenticated account, including connected calendar profiles.
      responses:
        '200':
          description: OK
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/UserInfo'
        '401':
          $ref: '#/components/responses/Unauthorized'
  /calendars:
    get:
      operationId: listCalendars
      tags:
        - Calendars
      summary: List calendars
      description: Returns the list of calendars the authenticated user has connected across all linked calendar profiles.
      responses:
        '200':
          description: OK
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/CalendarList'
        '401':
          $ref: '#/components/responses/Unauthorized'
    post:
      operationId: createCalendar
      tags:
        - Calendars
      summary: Create calendar
      description: Creates a new calendar within a connected calendar profile.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/CreateCalendarRequest'
      responses:
        '202':
          description: Accepted
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/CalendarWrapper'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '422':
          $ref: '#/components/responses/UnprocessableEntity'
  /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'
  /availability:
    post:
      operationId: availabilityQuery
      tags:
        - Availability
      summary: Availability query
      description: Inspects the calendars of the specified participants and resources to determine common available times within the requested periods.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/AvailabilityRequest'
      responses:
        '200':
          description: OK
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/AvailabilityResponse'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '422':
          $ref: '#/components/responses/UnprocessableEntity'
  /sequenced_availability:
    post:
      operationId: sequencedAvailability
      tags:
        - Availability
      summary: Sequenced availability query
      description: Determines available times for a sequence of dependent events, honoring ordering and gap constraints between them.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
      responses:
        '200':
          description: OK
        '401':
          $ref: '#/components/responses/Unauthorized'
        '422':
          $ref: '#/components/responses/UnprocessableEntity'
  /real_time_scheduling:
    post:
      operationId: realTimeScheduling
      tags:
        - Availability
      summary: Real-time scheduling
      description: Returns a URL to a hosted scheduling page where an invitee selects a preferred time from live availability; the resulting event is written into the host's calendar.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/RealTimeSchedulingRequest'
      responses:
        '200':
          description: OK
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/RealTimeSchedulingResponse'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '422':
          $ref: '#/components/responses/UnprocessableEntity'
  /real_time_sequencing:
    post:
      operationId: realTimeSequencing
      tags:
        - Availability
      summary: Real-time sequencing
      description: Returns a URL to a hosted page for selecting times across a sequence of related events backed by live availability.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
      responses:
        '200':
          description: OK
        '401':
          $ref: '#/components/responses/Unauthorized'
        '422':
          $ref: '#/components/responses/UnprocessableEntity'
  /smart_invites:
    post:
      operationId: upsertSmartInvite
      tags:
        - Smart Invites
      summary: Create or update smart invite
      description: Creates or updates a Smart Invite for a recipient. Set method to "cancel" to cancel a previously sent invite. No calendar authorization of the recipient is required.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/SmartInviteRequest'
      responses:
        '202':
          description: Accepted
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/SmartInviteResponse'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '422':
          $ref: '#/components/responses/UnprocessableEntity'
    get:
      operationId: getSmartInvite
      tags:
        - Smart Invites
      summary: Get smart invite
      description: Retrieves the current state of a Smart Invite, including each recipient's RSVP status.
      parameters:
        - name: smart_invite_id
          in: query
          required: true
          schema:
            type: string
        - name: recipient_email
          in: query
          schema:
            type: string
            format: email
      responses:
        '200':
          description: OK
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/SmartInviteResponse'
        '401':
          $ref: '#/components/responses/Unauthorized'
  /channels:
    post:
      operationId: createChannel
      tags:
        - Push Notifications
      summary: Create notification channel
      description: Creates a push notification channel; Cronofy will POST a notification to the supplied callback_url when changes occur in the user's calendars.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/CreateChannelRequest'
      responses:
        '202':
          description: Accepted
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ChannelWrapper'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '422':
          $ref: '#/components/responses/UnprocessableEntity'
    get:
      operationId: listChannels
      tags:
        - Push Notifications
      summary: List notification channels
      description: Returns all of the authenticated user's open notification channels.
      responses:
        '200':
          description: OK
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ChannelList'
        '401':
          $ref: '#/components/responses/Unauthorized'
  /channels/{channel_id}:
    delete:
      operationId: closeChannel
      tags:
        - Push Notifications
      summary: Close notification channel
      description: Closes an existing push notification channel so that no further notifications are sent.
      parameters:
        - name: channel_id
          in: path
          required: true
          schema:
            type: string
      responses:
        '202':
          description: Accepted
        '401':
          $ref: '#/components/responses/Unauthorized'
components:
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      description: OAuth 2.0 access token passed as an Authorization Bearer header.
  parameters:
    CalendarId:
      name: calendar_id
      in: path
      required: true
      schema:
        type: string
      description: The Cronofy id of the target calendar.
  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'
  schemas:
    Error:
      type: object
      properties:
        errors:
          type: object
          additionalProperties: true
          description: A map of field names to arrays of error descriptions.
    UserInfo:
      type: object
      properties:
        sub:
          type: string
          description: The unique account identifier.
        cronofy.type:
          type: string
        cronofy.data:
          type: object
          additionalProperties: true
    CalendarList:
      type: object
      properties:
        calendars:
          type: array
          items:
            $ref: '#/components/schemas/Calendar'
    CalendarWrapper:
      type: object
      properties:
        calendar:
          $ref: '#/components/schemas/Calendar'
    Calendar:
      type: object
      properties:
        provider_name:
          type: string
          description: The underlying provider, e.g. google, apple, exchange, office365.
        profile_id:
          type: string
        profile_name:
          type: string
        calendar_id:
          type: string
        calendar_name:
          type: string
        calendar_readonly:
          type: boolean
        calendar_deleted:
          type: boolean
        calendar_primary:
          type: boolean
        permission_level:
          type: string
    CreateCalendarRequest:
      type: object
      required:
        - profile_id
        - name
      properties:
        profile_id:
          type: string
          description: The profile within which to create the calendar.
        name:
          type: string
          description: The name of the new calendar.
        color:
          type: string
          description: An optional hex color for the calendar.
    EventList:
      type: object
      properties:
        pages:
          $ref: '#/components/schemas/Pages'
        events:
          type: array
          items:
            $ref: '#/components/schemas/Event'
    Pages:
      type: object
      properties:
        current:
          type: integer
        total:
          type: integer
        next_page:
          type: string
    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'
    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
    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
    DeleteEventRequest:
      type: object
      required:
        - event_id
      properties:
        event_id:
          type: string
          description: The caller-supplied identifier of the event to delete.
    AvailabilityRequest:
      type: object
      required:
        - participants
        - required_duration
        - available_periods
      properties:
        participants:
          type: array
          items:
            type: object
            properties:
              members:
                type: array
                items:
                  type: object
                  properties:
                    sub:
                      type: string
                      description: The account identifier of a participant.
              required:
                oneOf:
                  - type: string
                  - type: integer
        required_duration:
          type: object
          properties:
            minutes:
              type: integer
        available_periods:
          type: array
          items:
            type: object
            properties:
              start:
                type: string
              end:
                type: string
    AvailabilityResponse:
      type: object
      properties:
        available_periods:
          type: array
          items:
            type: object
            properties:
              start:
                type: string
              end:
                type: string
              participants:
                type: array
                items:
                  type: object
                  properties:
                    sub:
                      type: string
    RealTimeSchedulingRequest:
      type: object
      required:
        - oauth
        - event
        - availability
        - target_calendars
      properties:
        oauth:
          type: object
          properties:
            redirect_uri:
              type: string
              format: uri
        event:
          $ref: '#/components/schemas/UpsertEventRequest'
        availability:
          $ref: '#/components/schemas/AvailabilityRequest'
        target_calendars:
          type: array
          items:
            type: object
            properties:
              sub:
                type: string
              calendar_id:
                type: string
    RealTimeSchedulingResponse:
      type: object
      properties:
        real_time_scheduling:
          type: object
          properties:
            url:
              type: string
              format: uri
              description: The hosted scheduling page URL to present to the invitee.
            status:
              type: string
    SmartInviteRequest:
      type: object
      required:
        - smart_invite_id
        - callback_url
        - recipient
        - event
      properties:
        method:
          type: string
          enum:
            - request
            - cancel
          description: Use "cancel" to cancel a previously sent invite.
        smart_invite_id:
          type: string
        callback_url:
          type: string
          format: uri
        recipient:
          type: object
          properties:
            email:
              type: string
              format: email
        event:
          $ref: '#/components/schemas/UpsertEventRequest'
    SmartInviteResponse:
      type: object
      properties:
        smart_invite_id:
          type: string
        callback_url:
          type: string
          format: uri
        recipient:
          type: object
          properties:
            email:
              type: string
              format: email
            status:
              type: string
              enum:
                - pending
                - accepted
                - declined
                - tentative
        attachments:
          type: object
          properties:
            icalendar:
              type: string
              description: The iCalendar (.ics) attachment representing the invite.
    CreateChannelRequest:
      type: object
      required:
        - callback_url
      properties:
        callback_url:
          type: string
          format: uri
          description: The HTTPS URL Cronofy will POST notifications to when calendars change.
        filters:
          type: object
          properties:
            calendar_ids:
              type: array
              items:
                type: string
            only_managed:
              type: boolean
    ChannelWrapper:
      type: object
      properties:
        channel:
          $ref: '#/components/schemas/Channel'
    ChannelList:
      type: object
      properties:
        channels:
          type: array
          items:
            $ref: '#/components/schemas/Channel'
    Channel:
      type: object
      properties:
        channel_id:
          type: string
        callback_url:
          type: string
          format: uri
        filters:
          type: object
          additionalProperties: true