           "type": "object",
            "required": ["action", "subscriptionId", "requestId", "timestamp"],
            "properties": {
                "action": {
                    "enum": [ "unsubscribe", "unsubscribeAll"],
                    "description": "The identifier for the unsubscribe request",
                },
                "subscriptionId": {
                    "$ref": "#/definitions/subscriptionId",
                    "type": ["string", "null"]
                }, 
         