public function verify_order()
{
    if (strcasecmp($this->request->getMethod(), 'POST') === 0 ) {
  

        $key = $this->request->getPost('key');
        $salt = env('PAYU_MERCHANT_SALT');
        $txnid = $this->request->getPost('txnid');
        $amount = $this->request->getPost('amount');
        $productInfo = $this->request->getPost('productinfo');
        $status = $this->request->getPost('status');
        $resphash = $this->request->getPost('hash');
        //Calculate response hash to verify
        $keyString = $key . '|' . $txnid . '|' . $amount . '|' . $productInfo . '||||||||||||';
        $keyArray = explode("|", $keyString);
        $reverseKeyArray = array_reverse($keyArray);
        $reverseKeyString  =  implode("|",$reverseKeyArray);
        $CalcHashString = strtolower(hash('sha512', $salt . '|' . $status . '|' . $reverseKeyString)); //hash without additionalcharges

        //check for presence of additionalcharges parameter in response.
        $additionalCharges = "";

        if (isset($postdata["additionalCharges"])) {
            $additionalCharges = $postdata["additionalCharges"];
            //hash with additionalcharges
            $CalcHashString = strtolower(hash('sha512', $additionalCharges . '|' . $salt . '|' . $status . '|' . $reverseKeyString));
        }

        //Do success order processing here...
        if ($status == 'success' && $resphash == $CalcHashString) {
            //Additional step - Use verify payment api to double check payment.
            if ($this->verify_Payment($key, $salt, $txnid, $status)) {

                $purchaseModel = new PurchaseModel();
                $get_ins_media_id = session()->get('media_ins_id');
                $payu_payment_id = $this->request->getPost('mihpayid');
                $moviesModel = new MoviesModel();
                $get_movie_info = $moviesModel->where('id', session()->get('media_purchase_id'))->first();

                $rent_duration = $get_movie_info['rent_duration'];
                if ($get_movie_info['stream_start'] >= date("Y-m-d")) {
                    $stream_start_date = $get_movie_info['stream_start'];
                } else {
                    $stream_start_date = date("Y-m-d");
                }
                $data = array(
                    'stream_start_at' => $stream_start_date,
                    'stream_end_at' => date("Y-m-d", strtotime($stream_start_date . "+ " . $rent_duration . " days")),
                    'order_status' => 1,
                    'payu_txn_id' => $payu_payment_id
                );
                if ($purchaseModel->set($data)->where('id', $get_ins_media_id)->update()) {
                    if ($get_movie_info['stream_start'] > date("Y-m-d")) {
                        session()->set('prebook', true);
                    }
                    session()->remove('media_purchase_id');
                    session()->remove('media_ins_id');

                    return redirect()->to(base_u rl());

                } else {
                    echo "update error";
                    die;
                }

            } else {
                echo "Payment failed for Hash not verified...";
            }

        }
    }else{
        return redirect()->to(base_u rl());
    }

}

private function verify_Payment($key, $salt, $txnid, $status)
{
    $command = "verify_payment"; //mandatory parameter

    $hash_str = $key . '|' . $command . '|' . $txnid . '|' . $salt;
    $hash = strtolower(hash('sha512', $hash_str)); //generate hash for verify payment request

    $r = array('key' => $key, 'hash' => $hash, 'var1' => $txnid, 'command' => $command);

    $qs = http_build_query($r);
    //for production
    $wsUrl = "https://info.payu.in/merchant/postservice.php?form=2";

    //for test
    //$wsUrl = "https://test.payu.in/merchant/postservice.php?form=2";

    try {
        $c = curl_init();
        curl_setopt($c, CURLOPT_URL, $wsUrl);
        curl_setopt($c, CURLOPT_POST, 1);
        curl_setopt($c, CURLOPT_POSTFIELDS, $qs);
        curl_setopt($c, CURLOPT_CONNECTTIMEOUT, 30);
        curl_setopt($c, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($c, CURLOPT_SSLVERSION, 6); //TLS 1.2 mandatory
        curl_setopt($c, CURLOPT_SSL_VERIFYHOST, 0);
        curl_setopt($c, CURLOPT_SSL_VERIFYPEER, 0);
        $o = curl_exec($c);
        if (curl_errno($c)) {
            $sad = curl_error($c);
            throw new Exception($sad);
        }

        $response = json_decode($o, true);

        if (isset($response['status'])) {
            // response is in Json format. Use the transaction_details part for status
            $response = $response['transaction_details'];
            $response = $response[$txnid];

            if ($response['status'] == $status) //payment response status and verify status matched
                return true;
            else
                return false;
        } else {
            return false;
        }
    } catch (Exception $e) {
        return false;
    }
}