php - Cannot pass a negative value at paypal express checkout -


my paypal express check out work before trying add negative value coupon discount. cannot understand codding how pass negative value. please see script below:

//pass products  foreach($_post['item_name'] $key=>$itmname) {     $product_code   = filter_var($_post['item_code'][$key], filter_sanitize_string);       $results = $dbh->query("select name, price products id='$product_code' limit 1");     $obj = $results->fetch_object();      $paypal_data .= '&l_paymentrequest_0_name'.$key.'='.urlencode($obj->name).                     '&l_paymentrequest_0_number'.$key.'='.urlencode($_post['item_code'][$key]).                     '&l_paymentrequest_0_amt'.$key.'='.urlencode($obj->price).                           '&l_paymentrequest_0_qty'.$key.'='. urlencode($_post['item_qty'][$key]);      // item price x quantity     $subtotal = ($obj->price*$_post['item_qty'][$key]);      //total price     $itemtotalprice = $itemtotalprice + $subtotal;  }  ############################################## // trying pass negative value in way  if($_session["coupon_discount"] > $itemtotalprice){         $cname = "coupon discount";         $ccode = "code";         $cqty = 1;         $camt = 5;     $paypal_data .= '&l_paymentrequest_0_name='.urlencode($cname).                     '&l_paymentrequest_0_number='.urlencode($ccode).                     '&l_paymentrequest_0_qty='.urlencode($cqty).                     '&l_paymentrequest_0_amt='.urlencode($camt);         } ##############################################   // others paypal process $totaltaxamount     = 0;  $handalingcost  = 0; $insurancecost  = 0; $shippindiscount    = 0;  $shippincost        = 0;  $grandtotal = ($itemtotalprice + $totaltaxamount + $handalingcost + $insurancecost + $shippincost + $shippindiscount);  $padata =   '&method=setexpresscheckout'.             '&returnurl='.urlencode($paypalreturnurl ).             '&cancelurl='.urlencode($paypalcancelurl).             '&paymentrequest_0_paymentaction='.urlencode("sale").             $paypal_data.                            '&noshipping=0'.              '&paymentrequest_0_itemamt='.urlencode($itemtotalprice).             '&paymentrequest_0_taxamt='.urlencode($totaltaxamount).             '&paymentrequest_0_shippingamt='.urlencode($shippincost).             '&paymentrequest_0_handlingamt='.urlencode($handalingcost).             '&paymentrequest_0_shipdiscamt='.urlencode($shippindiscount).             '&paymentrequest_0_insuranceamt='.urlencode($insurancecost).             '&paymentrequest_0_amt='.urlencode($grandtotal).             '&paymentrequest_0_currencycode='.urlencode($paypalcurrencycode).             '&localecode=gb'.             '&logoimg=http://www.myweb.com/images/logo.png'.              '&cartbordercolor=000000'.              '&allownote=1';      // setexpresscheckout method obtain paypal token      $paypal= new mypaypal();     $httpparsedresponsear = $paypal->pphttppost('setexpresscheckout', $padata, $paypalapiusername, $paypalapipassword, $paypalapisignature, $paypalmode);      // success or error done here

here problem star after added these lines

    if($_session["coupon_discount"] > $itemtotalprice){         $cname = "coupon discount";         $ccode = "code";         $cqty = 1;         $camt = 5;     $paypal_data .= '&l_paymentrequest_0_name='.urlencode($cname).                     '&l_paymentrequest_0_number='.urlencode($ccode).                     '&l_paymentrequest_0_qty='.urlencode($cqty).                     '&l_paymentrequest_0_amt='.urlencode($camt);         }

this 1 makes me smile. can transfer money account otherwise smart person use negative values drain account. security.


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