using RestSharp;


var options = new RestClientOptions("http://localhost:56350/api/v1/Agents/User/IsUserNameValid");
var client = new RestClient(options);
var request = new RestRequest("");
request.AddJsonBody("{\n  \"AssociateId\": 123,\n  \"PersonId\": 123,\n  \"UserName\": \"<string>\"\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({AssociateId: 123, PersonId: 123, UserName: '<string>'})
};

fetch('http://localhost:56350/api/v1/Agents/User/IsUserNameValid', 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/Agents/User/IsUserNameValid",
  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([
    'AssociateId' => 123,
    'PersonId' => 123,
    'UserName' => '<string>'
  ]),
  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/Agents/User/IsUserNameValid"

payload = {
    "AssociateId": 123,
    "PersonId": 123,
    "UserName": "<string>"
}
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({AssociateId: 123, PersonId: 123, UserName: '<string>'})
};

fetch('http://localhost:56350/api/v1/Agents/User/IsUserNameValid', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

true