var url = "https://prod-16.southeastasia.logic.azure.com:443/workflows/d2ec6e25eefa48038cf8e2f690523ac5/triggers/request/paths/invoke?api-version=2016-10-01&sp=%2Ftriggers%2Frequest%2Frun&sv=1.0&sig=e1tA4EyRytpTQSd9nA1NSEQ00guki1qenTCEtgiTLf8";

            var client = new RestClient();

            var request = new RestRequest(url, Method.POST);

            string jsonToSend = "{\"IP\":\"172.67.152.33\"}";

            request.AddParameter("application/json; charset=utf-8", jsonToSend, ParameterType.RequestBody);
            request.RequestFormat = DataFormat.Json;

            try
            {
              var c=  client.ExecuteAsPost(request, "POST");
                Response.Write(c.Content);
            }
            catch (Exception error)
            {
                // Log
            }