Other Firebase notification with c# - Solved

   public static void notificar()
        {
            // Create a request using a URL that can receive a post.
            WebRequest request = WebRequest.Create("https://fcm.googleapis.com/fcm/send");
            // Set the Method property of the request to POST.
            request.Credentials = CredentialCache.DefaultCredentials;

            request.Method = "post";
            // Create POST data and convert it to a byte array.
            string postData = "{ \"data\":{ \"title\":\"Aviso\",\"body\":\"lávate los dientes.\"},\"to\":\"\\/topics\\/general\",\"priority\":\"high\"}";
                //"This is a test that posts this string to a Web server.";
            byte[] byteArray = Encoding.UTF8.GetBytes(postData);
            // Set the ContentType property of the WebRequest.
            request.ContentType = "application/json";
            // "application /x-www-form-urlencoded";
            request.Headers.Add("Authorization: key=put here you key");
            // Set the ContentLength property of the WebRequest.
            request.ContentLength = byteArray.Length;
            // Get the request stream.
            Stream dataStream = request.GetRequestStream();
            // Write the data to the request stream.
            dataStream.Write(byteArray, 0, byteArray.Length);

            //in previous point, the message was sender


            // Close the Stream object.
            dataStream.Close();
            // Get the response.
            WebResponse response = request.GetResponse();
            // Display the status.
            Console.WriteLine(((HttpWebResponse)response).StatusDescription);
            // Get the stream containing content returned by the server.
            dataStream = response.GetResponseStream();
            // Open the stream using a StreamReader for easy access.
            StreamReader reader = new StreamReader(dataStream);
            // Read the content.
            string responseFromServer = reader.ReadToEnd();
            // Display the content.
            Console.WriteLine(responseFromServer);
            // Clean up the streams.
            reader.Close();
            dataStream.Close();
            response.Close();
        }