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我正在尝试向 paypal 按钮添加折扣代码，javascript 工作并说折扣代码是有效的，但是当您单击“立即购买”按钮进行支付时，并没有从金额中扣除折扣。

谁能帮帮我

<form action="https://www.paypal.com/cgi-bin/webscr" method="post">
<p>Please click on the link to pay</p>
<input type="hidden" name="cmd" value="_cart" />
<input type="hidden" name="upload" value="1" />
<input type="hidden" name="business" value="<?php echo C_OUR_EMAIL; ?>" />
<input type="hidden" name="first_name" value="<?php echo strfordisp($ofirstname); ?>" />
<input type="hidden" name="last_name" value="<?php echo strfordisp($olastname); ?>" />
<input type="hidden" name="address1" value="<?php echo strfordisp($theorder["oaddress"]); ?>" />
<input type="hidden" name="address2" value="<?php echo strfordisp($theorder["oaddress2"]); ?>" />
<input type="hidden" name="address3" value="<?php echo strfordisp($theorder["oaddress3"]); ?>" />
<input type="hidden" name="city" value="<?php echo strfordisp($theorder["otown"]); ?>">
<input type="hidden" name="zip" value="<?php echo strfordisp($theorder["opostcode"]); ?>" />


<?php
$orderdets = mysql_query("select * from c4d_orderitems where orderid='" . $_SESSION["db_order"] . "' and confirm");
$iloop = 1;
while ($orderrow = mysql_fetch_array($orderdets))
{
$itemdesc = $orderrow["itemtypedesc"];
$itemdesc .= " to " . $orderrow["dpostcode"];
$itemprice = $orderrow["cost"] + $orderrow["surcharge"] + $orderrow["insurancecost"];
?>
<input type='hidden' name="item_name_<?php echo $iloop; ?>" value='<?php echo strfordisp($itemdesc); ?>' />
<input type='hidden' name="item_number_<?php echo $iloop; ?>" value='<?php echo $orderrow["itemtype"]; ?>' />
<input type='hidden' name="amount_<?php echo $iloop; ?>" value='<?php
  if ((strtoupper($ofirstname)=="PCTRENDSTEST") || (strtoupper($olastname)=="PCTRENDSTEST") || (substr($_SERVER['REMOTE_ADDR'],0,11)=="82.152.55.1"))
  echo("0.01");
  else echo $itemprice;
?>' />


<input type='hidden' name="baseamt_<?php echo $iloop; ?>" value='<?php if ((strtoupper($ofirstname)=="PCTRENDSTEST") || (strtoupper($olastname)=="PCTRENDSTEST") || (substr($_SERVER['REMOTE_ADDR'],0,11)=="82.152.55.1"))
  echo("0.01");
  else echo $itemprice;
?>' />
 <input type="hidden" name="basedes_<?php echo $iloop; ?>" value="" />



<input type='hidden' name="quantity_<?php echo $iloop; ?>" value='1' />

<?
    $iloop++;
  }
  ?>
<input type="hidden" name="return" value="<?php echo C_SITE_ROOT; ?>stage7.php" />
<meta http-equiv="return" content="3;url=stage7.php" />
<input type="hidden" name="cancel-return" value="<?php echo C_SITE_ROOT; ?>order-cancel.php" />
<input type="hidden" name="notify_url" value="<?php echo C_SITE_ROOT; ?>paypal.php" />
<input type="hidden" name="rm" value="2" />
<input type="hidden" name="invoice" value="<?php echo $_SESSION["db_order"]; ?>" />
<input type="hidden" name="currency_code" value="GBP" />
<input type="hidden" name="no-shipping" value="1" />
<input type="hidden" name="button_subtype" value="products" />
<input type="hidden" name="bn" value="PP-BuyNowBF:btn_buynowCC_LG.gif:NonHostedGuest" />
<input type="hidden" name="country" value="GB" />


Enter Coupon code
<input type="text" size="10" name="coupcode"; />
<input type="button" value="Check code" onclick="coupval =this.form.coupcode.value;  ChkCoup();" />



<p class='fmenu'><input type="image" src="https://www.paypal.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.paypal.com/en_US/i/scr/pixel.gif" width="1" height="1"></p>
     </form>

javascript是：

var discnt = 0;   // no default percent discount



var coupons = new Array (  // place to put coupon codes

  "coup1",                 // 1st coupon value - comma seperated

  "coup2",                 // 2nd coupon value - add all you want

  "coup3"                  // 3rd coupon value
);
var coupdc  = new Array ( 5,10,15
 // place to put discounts for coupon vals
);
var coupval = "(blanket)"; // what user entered as coupon code
function ChkCoup () {      // check user coupon entry
var i;
  discnt = 0;              // assume the worst
  for (i=0; i<coupons.length; i++) {
    if (coupval == coupons[i]) {
      discnt = coupdc[i];  // remember the discount amt
      alert ("This is a valid promo code! \n\n" + discnt + "%" +" discount now in effect.");
      return;

    }
  }
  alert ("'" + coupval + "'  is not a valid promo code!");
}
function Pound (val) {      // force to valid Pound amount
var str,pos,rnd=0;
  if (val < .995) rnd = 1;  // for old Netscape browsers
  str = escape (val*1.0 + 0.005001 + rnd);  // float, round, escape
  pos = str.indexOf (".");
  if (pos > 0) str = str.substring (rnd, pos + 3);
  return str;
}
function ReadForm (obj1) {  // apply the discount
var amt,des;
  amt = obj1.amount_<?php echo $iloop; ?>.value*1.0;       // base amount
  des = obj1.basedes_<?php echo $iloop; ?>.value;           // base description
  if (discnt > 0) {                   // only if discount is active
    amt = Pound (amt - (amt * discnt/100.0));
    des = des + ", " + discnt + "%" + "dis, COUP = " + coupval;
  }
  obj1.amount.value = Pound (amt);
  obj1.item_name.value = des;
}
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