using RestSharp;


var options = new RestClientOptions("http://localhost:56350/api/v1/ChatSession/{chatSessionId}/Messages");
var client = new RestClient(options);
var request = new RestRequest("");
request.AddJsonBody("{\n  \"ChatMessageId\": 123,\n  \"ChatSessionId\": 123,\n  \"Message\": \"<string>\",\n  \"Author\": \"<string>\",\n  \"ReadByCustomer\": 123,\n  \"SpecialParam\": \"<string>\",\n  \"WhenPosted\": \"2023-11-07T05:31:56Z\"\n}", false);
var response = await client.PostAsync(request);

Console.WriteLine("{0}", response.Content);

const options = {
  method: 'POST',
  headers: {'Content-Type': 'application/json'},
  body: JSON.stringify({
    ChatMessageId: 123,
    ChatSessionId: 123,
    Message: '<string>',
    Author: '<string>',
    ReadByCustomer: 123,
    SpecialParam: '<string>',
    WhenPosted: '2023-11-07T05:31:56Z'
  })
};

fetch('http://localhost:56350/api/v1/ChatSession/{chatSessionId}/Messages', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_PORT => "56350",
  CURLOPT_URL => "http://localhost:56350/api/v1/ChatSession/{chatSessionId}/Messages",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'ChatMessageId' => 123,
    'ChatSessionId' => 123,
    'Message' => '<string>',
    'Author' => '<string>',
    'ReadByCustomer' => 123,
    'SpecialParam' => '<string>',
    'WhenPosted' => '2023-11-07T05:31:56Z'
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

import requests

url = "http://localhost:56350/api/v1/ChatSession/{chatSessionId}/Messages"

payload = {
    "ChatMessageId": 123,
    "ChatSessionId": 123,
    "Message": "<string>",
    "Author": "<string>",
    "ReadByCustomer": 123,
    "SpecialParam": "<string>",
    "WhenPosted": "2023-11-07T05:31:56Z"
}
headers = {"Content-Type": "application/json"}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'POST',
  headers: {'Content-Type': 'application/json'},
  body: JSON.stringify({
    ChatMessageId: 123,
    ChatSessionId: 123,
    Message: '<string>',
    Author: '<string>',
    ReadByCustomer: 123,
    SpecialParam: '<string>',
    WhenPosted: '2023-11-07T05:31:56Z'
  })
};

fetch('http://localhost:56350/api/v1/ChatSession/{chatSessionId}/Messages', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

{
  "ChatMessageId": 123,
  "ChatSessionId": 123,
  "Type": "Invalid",
  "Message": "<string>",
  "Author": "<string>",
  "ReadByCustomer": 123,
  "SpecialType": "None",
  "SpecialParam": "<string>",
  "WhenPosted": "2023-11-07T05:31:56Z"
}