required:
- zoneId
- timestamp
properties:
  callbackData:
    $ref: '#/definitions/CallbackData'
  zoneId:
    $ref: '#/definitions/ZoneId'
  accessPointId:
    $ref: '#/definitions/AccessPointId'
  numberOfUsersInZone:
    $ref: '#/definitions/NumberOfUsersInZone'
  numberOfUsersInAP:
    $ref: '#/definitions/NumberOfUsersInAP'
  operationStatus:
    $ref: '#/definitions/OperationStatus'
  timestamp:
    $ref: '#/definitions/Timestamp'
  link:
    description: Link to other resources that are in relationship with this notification. The server SHOULD include a link to the related subscription. No other links are required or suggested by this specification.
    type: array
    items:
      $ref: '#/definitions/Link'
    example: rel="ZonalStatusSubscription" href="http://example.com/exampleAPI/location/v1/subscriptions/zonalStatus/sub123"