GoogleApiTransport::prepareErrorForDebug

private function prepareErrorForDebug(): string
{
	if (!$this->errors || !is_array($this->errors))
	{
		return '';
	}

	$result = '';
	foreach ($this->errors as $error)
	{
		$result .= $error['code'] . " " . $error['message'] . "; ";
	}

	return $result;
}