public function getDecrypt($message, $accessKey)
    {
        $cipher = "AES-256-ECB";
        $opts = OPENSSL_RAW_DATA | OPENSSL_ZERO_PADDING;

        $message = $this->base64_url_decode($message);
        $decrypted = openssl_decrypt($message, $cipher, $accessKey, $opts);
        $len = strlen($decrypted);
        $pad = ord($decrypted[$len - 1]);

        return substr($decrypted, 0, strlen($decrypted) - $pad);
    }