in src/Credential.php [49:61]
public function __construct($config = [])
{
if (\is_array($config)) {
if (empty($config)) {
$this->config = null;
} else {
$this->config = new Config($this->parseConfig($config));
}
} else {
$this->config = $config;
}
$this->credential = $this->getCredentials($this->config);
}