Looking For PHP coder to fix my paypal IPN script 5$

Code

<?php

require_once 'includes/db.php';

require_once 'includes/init.php';

require_once 'includes/cCoupon.php';



   // Send an empty HTTP 200 OK response to acknowledge receipt of the notification 

   header('HTTP/1.1 200 OK'); 

     // Assign payment notification values to local variables

  $item_name      = $_POST['item_name'];

  $item_number      = $_POST['item_number'];

  $payment_status   = $_POST['payment_status'];

  $payment_amount   = $_POST['mc_gross'];

  $payment_currency = $_POST['mc_currency'];

  $txn_id      = $_POST['txn_id'];

  $receiver_email   = $_POST['receiver_email'];

  $payer_email      = $_POST['payer_email'];

    // Build the required acknowledgement message out of the notification just received

  $req = 'cmd=_notify-validate';      // Add 'cmd=_notify-validate' to beginning of the acknowledgement



  foreach ($_POST as $key => $value) {      // Loop through the notification NV pairs

    $value = urlencode(stripslashes($value));  // Encode these values

    $req  .= "&$key=$value";      // Add the NV pairs to the acknowledgement

  }

   // Set up the acknowledgement request headers

  $header  = "POST /cgi-bin/webscr HTTP/1.1\r\n";      // HTTP POST request

  $header .= "Content-Type: application/x-www-form-urlencoded\r\n";

  $header .= "Content-Length: " . strlen($req) . "\r\n\r\n";



  // Open a socket for the acknowledgement request

  $fp = fsockopen('ssl://www.paypal.com', 443, $errno, $errstr, 30);



  // Send the HTTP POST request back to PayPal for validation

  fputs($fp, $header . $req);

    while (!feof($fp)) {      // While not EOF

    $res = fgets($fp, 1024);      // Get the acknowledgement response



      if (!strcmp ($reply, "VERIFIED"))

      {

    if($payment_status == "Completed"){



                        $code = $_POST['item_name'];

                        $amount = $_POST['quantity'];

                        $uid = $_POST['custom'];;



                        if(strlen($code) > 30 || strlen($code) == 0 || empty($code))

                        {

                        $errors[] = "Code must be between 1-30 chars";

                        }

                        if(!ctype_alnum($code))

                        {

                        $errors[] = "Code must only contain a-z 0-9";

                        }

                        if(!is_numeric($amount) && $amount > 1)

                        {

                        $errors[] = "Amount must be a valid integer above 1";

                        }

                        if (empty($errors))

                        {

                        $cCoupon = new CouponClass($odb);

                        if($cCoupon->addCoupon($code, $amount))

                        {



                        }else{



                        }

                        }

                        else

                        {

                        foreach($errors as $error)

                        {



                        }

                        }



                        require_once('includes/cCoupon.php');

                        $errors = array();



                        if(!ctype_alnum($code))

                        {

                        array_push($errors,"Voucher can only contain 0-9 A-Z");

                        }



                        if (empty($errors))

                        {

                        $cCoupon = new CouponClass($odb);

                        if($cCoupon->useCoupon($code, $uid))

                        {

                        $getCoupon = $odb->prepare("select `Amount` from `coupons` where `Code` = :Code and `UserID` = :UID");

                        $getCoupon->execute(array(

                        ":Code" => $code,

                        ":UID" => $uid,

                        ));



                        $amount = intval($getCoupon->fetchColumn(0));



                        $addCredits = $odb->prepare("insert into `creditpayments`(paid, type, payer, credits, UserID, tid, date) values('0', 'Coupon', 'Coupon', :Credits, :UserID, 0, unix_timestamp())");

                        $addCredits->execute(array(

                        ":Credits" => $amount,

                        ":UserID" => $uid,

                        ));



                        }else{



                        }

                        }

                        else

                        {



                        foreach($errors as $error)

                        {

                        echo ' '.$error.'</p></div>';

                        }

                        }

    } 

    else if (strcmp ($res, "INVALID") == 0) { //Response contains INVALID - reject notification



      // Send an email announcing the IPN message is INVALID



    }

  }

  }



  ?>

Code

<form action="https://www.paypal.com/cgi-bin/webscr" method="post" target="_top">

      <input type="hidden" name="cmd" value="_s-xclick">

      <input type="hidden" name="hosted_button_id" value="N8Z4G73SG49R6">

      <input type="hidden" name="lc" value="US" >

      <input type="hidden" name="item_name" value="<?php echo $code ?>" >

      <input type="hidden" name="amount" value="1" >

      <input type="hidden" name="quantity" value="<?php echo $amount1 ?>" >

      <input type="hidden" name="currency_code" value="USD" >

      <input type="hidden" name="custom" value="<?php $_SESSION['ID']; ?>" >

      <input type="hidden" name="button_subtype" value="services" >

      <input type="hidden" name="no_note" value="0" >

      <input type="hidden" name="notify_url" value="http://fishin.rs/ipn.php" />

      <input type="image" src="https://www.paypalobjects.com/en_US/i/btn/btn_buynowCC_LG.gif" border="0" name="submit" alt="PayPal - The safer, easier way to pay online!">

      <img alt="" border="0" src="https://www.paypalobjects.com/en_US/i/scr/pixel.gif" width="1" height="1">

</form>