Сниппет для PHP

[feldwebel]

$host = 'simple.stage.freetc.net:443';
$key = 'your_secret_key';
$cred = [
    'credentials' => ChannelCredentials::createSsl(), // защищённое соединение
];
$opt = [
    'authorization' => [$key], // ключ упакован в массив
];

$client = new SimpleClient($host, $cred);

$countriesRequest = (new CountriesRequest())->setIds(["ZM"]);

$countries = $client->Countries($countriesRequest, $opt)->responses();

foreach ($countries as $country) {
    var_dump($country->getName());
}