ionId": {
                    "$ref": "#/definitions/subscriptionId",
                    "type": ["string", "null"]
                }, 
                "requestId": {
                    "$ref": "#/definitions/requestId"
                }
            }
        }

        {
            "$schema": "http://json-schema.org/draft-04/schema#",
            "title": "Unsubscribe Success Response",
            "description": "The response sent from the server upon a successful subscription request",
 