alue"
                },
                "timestamp": {
                    "$ref": "#/definitions/timestamp"
                }
            }
        }

        {
            "$schema": "http://json-schema.org/draft-04/schema#",
            "title": "Subscription Notification Error",
            "description": "Error message sent by the server when there is an error with an existing subscription",
            "type": "object",
            "required": ["subscriptionId", "error", "timestamp"],
 