curl --request POST \
  --url https://accounts.livechat.com/v2/customer/{organization_id}/{group_id}/token/ \
  --header 'Content-Type: application/json' \
  --cookie __lc_cid= \
  --data '
{
  "client_id": "<string>",
  "redirect_uri": "<string>",
  "license_id": 123,
  "entity_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "expires_in": 123,
  "code": "<string>",
  "code_verifier": "<string>"
}
'

import requests

url = "https://accounts.livechat.com/v2/customer/{organization_id}/{group_id}/token/"

payload = {
    "client_id": "<string>",
    "redirect_uri": "<string>",
    "license_id": 123,
    "entity_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "expires_in": 123,
    "code": "<string>",
    "code_verifier": "<string>"
}
headers = {
    "cookie": "__lc_cid=",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {cookie: '__lc_cid=', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    client_id: '<string>',
    redirect_uri: '<string>',
    license_id: 123,
    entity_id: '3c90c3cc-0d44-4b50-8888-8dd25736052a',
    expires_in: 123,
    code: '<string>',
    code_verifier: '<string>'
  })
};

fetch('https://accounts.livechat.com/v2/customer/{organization_id}/{group_id}/token/', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://accounts.livechat.com/v2/customer/{organization_id}/{group_id}/token/",
  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([
    'client_id' => '<string>',
    'redirect_uri' => '<string>',
    'license_id' => 123,
    'entity_id' => '3c90c3cc-0d44-4b50-8888-8dd25736052a',
    'expires_in' => 123,
    'code' => '<string>',
    'code_verifier' => '<string>'
  ]),
  CURLOPT_COOKIE => "__lc_cid=",
  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;
}

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://accounts.livechat.com/v2/customer/{organization_id}/{group_id}/token/"

	payload := strings.NewReader("{\n  \"client_id\": \"<string>\",\n  \"redirect_uri\": \"<string>\",\n  \"license_id\": 123,\n  \"entity_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"expires_in\": 123,\n  \"code\": \"<string>\",\n  \"code_verifier\": \"<string>\"\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("cookie", "__lc_cid=")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.post("https://accounts.livechat.com/v2/customer/{organization_id}/{group_id}/token/")
  .header("cookie", "__lc_cid=")
  .header("Content-Type", "application/json")
  .body("{\n  \"client_id\": \"<string>\",\n  \"redirect_uri\": \"<string>\",\n  \"license_id\": 123,\n  \"entity_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"expires_in\": 123,\n  \"code\": \"<string>\",\n  \"code_verifier\": \"<string>\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://accounts.livechat.com/v2/customer/{organization_id}/{group_id}/token/")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["cookie"] = '__lc_cid='
request["Content-Type"] = 'application/json'
request.body = "{\n  \"client_id\": \"<string>\",\n  \"redirect_uri\": \"<string>\",\n  \"license_id\": 123,\n  \"entity_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"expires_in\": 123,\n  \"code\": \"<string>\",\n  \"code_verifier\": \"<string>\"\n}"

response = http.request(request)
puts response.read_body

{
  "access_token": "<string>",
  "client_id": "<string>",
  "entity_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "expires_in": 123,
  "token_type": "<string>"
}

{
  "exception_description": "<string>"
}