Firebase Multiple Message C#

 https://drive.google.com/drive/folders/1aCni1wSrVxI_HAPJSMQyL4NqVmyaB5Kp?usp=sharing

public IActionResult send()

        {

            var token = new List<string>(){ "cxTeC_oLTPm-dUx7NYOHWA:APA91bGr9UaN3r_oOGpK7lSMNBTQceVuJI4-ylct3n16HLE6bz037cCf9xbLuWECEkK0qOynZ7BqFRpAXTR7xI6I2Q--ia_qsmgSfHnGlov8XxmDjLirT7qpccYCnrdKMNNKYKc15_un",

            "cTKCuKxv99_KfGeszSNK9e:APA91bHbRmsCCYPtYZjh8YWB48cUvuGQjzoDmFAbjGb9AymprrX7cbrY0G6FSkyGDpXkn9E6laqiPnTRcU95fks5Ssu5NbBntrurrBeOkZxAMHI_8mY34fi5bnrFufac6FWmTfQwuY7r",

            "fwMSzFl_isuQRxpE-UqXkZ:APA91bHMzXypcPOWXK5mb6TlSV99F7BsSoKd_Ak9iI4AhkOJWf3Y42g_vtuv0n5J5hPvqm_-EQP4SYVHNb5LX9YV9qdPid5UMKoXFk2TTKjPmdAwegmrQZMqK0sTRStXatSQVqs-SA0-"};

            SendNotificationMulti(token); 

            return Content("ok");

        }

        public void SendNotificationMulti(List<string> token)

        {

            WebRequest tRequest = WebRequest.Create("https://fcm.googleapis.com/fcm/send");

            tRequest.Method = "post";

            //serverKey - Key from Firebase cloud messaging server  

            tRequest.Headers.Add(string.Format("Authorization: key={0}", "AAAAJK69hmY:APA91bFIAlxCongUoFHwTvObduFKhi9KKdT0d7LII8290jcS0yTXAx170oes6bA89CzhSWowv3xBMlo6MzglNqVXYYa0IXsuy3G0CmoYjz-bxRNGTVdbbRmABoj9CUn7GcjO1fzHXUnU"));

            //Sender Id - From firebase project setting  

            tRequest.Headers.Add(string.Format("Sender: id={0}", "157550478950"));

            tRequest.ContentType = "application/json";

            var payload = new

            {

                registration_ids = token,

                priority = "high",

                content_available = true,

                notification = new

                {

                    body = "notif firebase",

                    title = "SMS!",

                    badge = 2,

                    icon = "https://cdn.showtime.co.id/images_2/images/v2/Carousel-My-Showtime---Premium-Membership.jpg",

                    click_action = "https://myshowtime.world"

                }

            };

            string postbody = JsonConvert.SerializeObject(payload).ToString();

            Byte[] byteArray = Encoding.UTF8.GetBytes(postbody);

            tRequest.ContentLength = byteArray.Length;

            using (Stream dataStream = tRequest.GetRequestStream())

            {

                dataStream.Write(byteArray, 0, byteArray.Length);

                using (WebResponse tResponse = tRequest.GetResponse())

                {

                    using (Stream dataStreamResponse = tResponse.GetResponseStream())

                    {

                        if (dataStreamResponse != null) using (StreamReader tReader = new StreamReader(dataStreamResponse))

                            {

                                String sResponseFromServer = tReader.ReadToEnd();

                                //result.Response = sResponseFromServer;

                            }

                    }

                }

            }

        }