asyncapi: 2.6.0
info:
  title: Microsoft Graph Change Notifications
  description: >-
    Microsoft Graph change notifications enable applications to receive
    real-time notifications when data changes occur in Microsoft Graph
    resources. Applications create subscriptions specifying which resources
    to monitor and a webhook endpoint to receive notifications. When a
    change occurs (create, update, or delete), Microsoft Graph sends a
    POST request to the specified notification URL containing one or more
    changeNotification objects wrapped in a changeNotificationCollection.
    Supported resources include Outlook messages, events, and contacts;
    Teams chats, channels, and messages; OneDrive and SharePoint items;
    directory objects such as users and groups; security alerts; and
    presence information. Notifications can optionally include encrypted
    resource data for rich notification scenarios. Lifecycle notifications
    inform apps about subscription expiration, removal, and
    reauthorization requirements.
  version: '1.0'
  contact:
    name: Microsoft Graph Support
    url: https://developer.microsoft.com/en-us/graph/support
  license:
    name: Microsoft APIs Terms of Use
    url: https://learn.microsoft.com/en-us/legal/microsoft-apis/terms-of-use
  externalDocs:
    description: Microsoft Graph Change Notifications Documentation
    url: https://learn.microsoft.com/en-us/graph/change-notifications-overview
servers:
  production:
    url: 'https://graph.microsoft.com/v1.0'
    protocol: https
    description: >-
      Microsoft Graph v1.0 production endpoint. Applications create
      subscriptions via the REST API, and Microsoft Graph delivers
      change notifications to the application's webhook endpoint.
    security:
      - oauth2: []
channels:
  /webhook:
    description: >-
      The webhook endpoint hosted by the subscribing application.
      Microsoft Graph sends HTTP POST requests to this URL when changes
      occur in subscribed resources. The endpoint must support HTTPS,
      respond to validation requests during subscription creation, and
      return HTTP 202 Accepted for notification deliveries.
    publish:
      operationId: receiveChangeNotifications
      summary: Receive change notifications from Microsoft Graph
      description: >-
        Microsoft Graph delivers change notification payloads to the
        subscriber's webhook endpoint as HTTP POST requests. Each
        payload is a changeNotificationCollection containing one or
        more changeNotification objects. The subscriber must respond
        with HTTP 202 Accepted within 3 seconds to acknowledge receipt.
        Notifications may include basic resource references or encrypted
        resource data depending on the subscription configuration.
      message:
        oneOf:
          - $ref: '#/components/messages/ChangeNotificationCollection'
          - $ref: '#/components/messages/ValidationRequest'
  /lifecycleNotifications:
    description: >-
      The lifecycle notification endpoint hosted by the subscribing
      application, specified via the lifecycleNotificationUrl property
      when creating a subscription. Microsoft Graph sends lifecycle
      events to inform the application about subscription state changes
      including missed notifications, subscription removal, and
      reauthorization requirements.
    publish:
      operationId: receiveLifecycleNotifications
      summary: Receive lifecycle notifications for subscription management
      description: >-
        Microsoft Graph sends lifecycle notifications when a subscription
        encounters issues that require the application's attention. These
        include missed notifications (when delivery failed), subscription
        removal (when the subscription was removed by the service), and
        reauthorization required (when the app's access token needs
        renewal). Applications must handle these events to maintain
        reliable notification delivery.
      message:
        $ref: '#/components/messages/LifecycleNotification'
components:
  securitySchemes:
    oauth2:
      type: oauth2
      description: >-
        OAuth 2.0 authorization using Microsoft identity platform.
        Applications must register in Microsoft Entra ID and obtain
        tokens with appropriate permissions to create subscriptions
        and receive change notifications.
      flows:
        clientCredentials:
          authorizationUrl: https://login.microsoftonline.com/{tenantId}/oauth2/v2.0/authorize
          tokenUrl: https://login.microsoftonline.com/{tenantId}/oauth2/v2.0/token
          scopes:
            https://graph.microsoft.com/.default: Access Microsoft Graph resources
  messages:
    ChangeNotificationCollection:
      name: changeNotificationCollection
      title: Change Notification Collection
      summary: >-
        A collection of one or more change notifications delivered to the
        subscriber's webhook endpoint when subscribed resources change.
      contentType: application/json
      payload:
        $ref: '#/components/schemas/ChangeNotificationCollection'
    ValidationRequest:
      name: validationRequest
      title: Webhook Validation Request
      summary: >-
        A validation request sent by Microsoft Graph when a subscription
        is created or renewed. The endpoint must respond with the
        validationToken value in the response body as plain text within
        10 seconds.
      contentType: application/json
      payload:
        $ref: '#/components/schemas/ValidationRequest'
    LifecycleNotification:
      name: lifecycleNotification
      title: Lifecycle Notification
      summary: >-
        A lifecycle notification informing the application about
        subscription state changes that require attention, such as
        missed notifications, subscription removal, or the need for
        reauthorization.
      contentType: application/json
      payload:
        $ref: '#/components/schemas/LifecycleNotificationPayload'
  schemas:
    ChangeNotificationCollection:
      type: object
      description: >-
        A collection of change notifications sent as a single POST
        request to the subscriber's webhook endpoint. May contain
        notifications from multiple subscriptions.
      properties:
        value:
          type: array
          description: >-
            The set of change notifications being delivered in this
            payload.
          items:
            $ref: '#/components/schemas/ChangeNotification'
      required:
        - value
    ChangeNotification:
      type: object
      description: >-
        Represents a single change notification for a subscribed
        resource. Contains information about what changed, which
        subscription triggered the notification, and optionally
        the changed resource data.
      properties:
        id:
          type: string
          description: >-
            Unique identifier for this notification.
        subscriptionId:
          type: string
          format: uuid
          description: >-
            The unique identifier of the subscription that generated
            this notification.
        subscriptionExpirationDateTime:
          type: string
          format: date-time
          description: >-
            The expiration date and time of the subscription that
            generated this notification.
        clientState:
          type: string
          maxLength: 255
          description: >-
            The value of the clientState property sent in the
            subscription request, used to verify the authenticity
            of the notification.
        changeType:
          type: string
          description: >-
            The type of change that triggered the notification.
          enum:
            - created
            - updated
            - deleted
        resource:
          type: string
          description: >-
            The URI of the resource that changed, relative to
            https://graph.microsoft.com.
        resourceData:
          $ref: '#/components/schemas/ResourceData'
        encryptedContent:
          $ref: '#/components/schemas/ChangeNotificationEncryptedContent'
        tenantId:
          type: string
          format: uuid
          description: >-
            The unique identifier of the Microsoft Entra tenant
            from which the change notification originated.
      required:
        - subscriptionId
        - subscriptionExpirationDateTime
        - changeType
        - resource
        - tenantId
    ResourceData:
      type: object
      description: >-
        Basic information about the resource that triggered the
        change notification, including the resource type and identifier.
      properties:
        '@odata.type':
          type: string
          description: >-
            The OData entity type of the resource, such as
            #microsoft.graph.message or #microsoft.graph.chatMessage.
        '@odata.id':
          type: string
          description: >-
            The OData identifier for the resource instance.
        '@odata.etag':
          type: string
          description: >-
            The HTTP entity tag that represents the version of the
            resource.
        id:
          type: string
          description: >-
            The identifier of the resource that triggered the
            notification.
    ChangeNotificationEncryptedContent:
      type: object
      description: >-
        Encrypted resource data attached to a change notification when
        the subscription was configured with includeResourceData set to
        true and an encryption certificate. The data is encrypted using
        the public key from the certificate provided during subscription
        creation.
      properties:
        data:
          type: string
          description: >-
            Base64-encoded encrypted data that, when decrypted, produces
            a JSON string conforming to the resource type indicated by
            dataType.
        dataSignature:
          type: string
          description: >-
            Base64-encoded HMAC-SHA256 hash of the data for validation
            purposes.
        dataKey:
          type: string
          description: >-
            Base64-encoded symmetric key generated by Microsoft Graph
            to encrypt the data value and to generate the data signature.
            This key is encrypted with the certificate public key
            provided during subscription creation.
        encryptionCertificateId:
          type: string
          description: >-
            The ID of the certificate used to encrypt the dataKey.
        encryptionCertificateThumbprint:
          type: string
          description: >-
            Base64-encoded thumbprint of the certificate used to
            encrypt the dataKey.
      required:
        - data
        - dataSignature
        - dataKey
        - encryptionCertificateId
        - encryptionCertificateThumbprint
    ValidationRequest:
      type: object
      description: >-
        Sent as a query parameter during subscription creation to
        validate the webhook endpoint. The endpoint must echo back
        the validationToken value as plain text in the response body.
      properties:
        validationToken:
          type: string
          description: >-
            A token string that the webhook endpoint must return in
            the response body as plain text to prove ownership of
            the notification URL.
      required:
        - validationToken
    LifecycleNotificationPayload:
      type: object
      description: >-
        A lifecycle notification payload informing the application
        about subscription management events. The lifecycleEvent
        property indicates the type of event, and the notification
        includes subscription identifiers for correlation.
      properties:
        value:
          type: array
          description: >-
            The set of lifecycle notifications in this payload.
          items:
            $ref: '#/components/schemas/LifecycleNotificationItem'
      required:
        - value
    LifecycleNotificationItem:
      type: object
      description: >-
        A single lifecycle notification item indicating a subscription
        state change that requires the application's attention.
      properties:
        id:
          type: string
          description: >-
            Unique identifier for this lifecycle notification.
        subscriptionId:
          type: string
          format: uuid
          description: >-
            The unique identifier of the affected subscription.
        subscriptionExpirationDateTime:
          type: string
          format: date-time
          description: >-
            The expiration date and time of the affected subscription.
        clientState:
          type: string
          maxLength: 128
          description: >-
            The clientState value from the subscription, for
            verification purposes.
        tenantId:
          type: string
          format: uuid
          description: >-
            The unique identifier of the originating Microsoft Entra
            tenant.
        lifecycleEvent:
          type: string
          description: >-
            The type of lifecycle event. Applications must handle
            each type to maintain reliable notification delivery.
          enum:
            - missed
            - subscriptionRemoved
            - reauthorizationRequired
        resource:
          type: string
          description: >-
            The URI of the resource associated with the subscription,
            relative to https://graph.microsoft.com.
        resourceData:
          $ref: '#/components/schemas/ResourceData'
      required:
        - subscriptionId
        - lifecycleEvent
        - tenantId