Omnipay\Alipay\Common\Signer::format PHP Метод

    public function format($key, $type)
    {
        if (is_file($key)) {
            $key = file_get_contents($key);
        }
        if (is_string($key) && strpos($key, '-----') === false) {
            $key = $this->convertKey($key, $type);
        }
        return $key;
    }