The remote server returned an error: (400) Bad Request.

Am getting the below error , can anyone give the solution

var httpWebRequest = (HttpWebRequest)WebRequest.Create(" https://inventory.zoho.com/api/v1/contacts/contactpersons?authtoken=cb327707a0e8539254fcd3a58d896b43&organization_id=673578474");

httpWebRequest.ContentType = "application/json;charset=UTF-8";

httpWebRequest.Accept = "*/*";

httpWebRequest.Method = "POST";

httpWebRequest.Headers.Add("authtoken", "cb327707a0e8539254fcd3a58d896b43");

httpWebRequest.Headers.Add("organization_id", "673578474");

var vJsonData = "{\"contact_id\": 1523420000000070013,\"salutation\": \"Mr\",\"first_name\": \"Jams\",\"last_name\": \"jarald\",\"email\": \" jamsjarald@mobiusservies.in\",\"phone\": \"+044-123654\",\"mobile\": \"+91-9842326244\",\"skype\": \"skypePIM\",\"designation\": \"TESTING\",\"department\": \"TESTING Team\",\"enable_portal\": true }";

var json = vJsonData.ToString();

//json = "{" + json + "}";

json = json.Replace(@"\", "");

using (var writer123 = new System.IO.StreamWriter(httpWebRequest.GetRequestStream()))

{

writer123.Write(json);

writer123.Flush();

writer123.Close();

}

System.Net.ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls11 | SecurityProtocolType.Tls12;

var httpResponse = (HttpWebResponse)httpWebRequest.GetResponse();

var response123 = new HttpResponseMessage(HttpStatusCode.OK);

using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))

{

var objText = streamReader.ReadToEnd();

var objJson = (Newtonsoft.Json.Linq.JObject)Newtonsoft.Json.JsonConvert.DeserializeObject(objText);

response123.Content = new StringContent(objText);

}

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