from pprint import pprint
from MW_API import MW_API
mw_api = MW_API('YOUR_API_KEY')
res = mw_api.do_request('GET','/campaign/download_testcase_file/B/2168e3b09815/format/json', {}, {})
pprint(res)

use MW_API;
use Data::Dumper qw(Dumper);
my $mw_api = MW_API->new('api_key' => 'YOUR_API_KEY');
my $res = $mw_api->do_request('GET', '/campaign/download_testcase_file/B/2168e3b09815/format/json');
print Dumper($res);

<?php

include "includes/RESTClient.php";
define("cAPI_KEY", "YOUR_API_KEY");
define("cAPI_URL", "https://ttv.microworkers.com/api");
$client = new RESTClient();
$client->setApiKey(cAPI_KEY);
$client->setUrl(cAPI_URL . "/campaign/download_testcase_file/B/2168e3b09815/format/json");
$client->setMethod("GET");
$client->execute();
$response = $client->getLastResponse();
$client->resetClient();
echo $response;
?>

using System;
using MWAPI;
using System.Collections.Specialized;

public class Test{
  public static void Main (string[] args){
    MW_API MW_API_Client = new MW_API ("YOUR_API_KEY");
NameValueCollection postData = new NameValueCollection();
    
    string body = MW_API_Client.getRequest("/campaign/download_testcase_file/B/2168e3b09815/format/json");
    Console.WriteLine (body);
  }
}

{
  "status": "ERROR",
  "message": "TTVAPI-E0004:TTVCampaign-E0000:Campaign does not exists with id '2094d155266_HG'"
}