php paypal快速结账问题

I'm trying to integrate paypal express checkout on my website. I was trying to check using sandbox. When I submit data from my site token is generated with no error but when redirected to paypal it's not showing payment amount. btw I'm using the code from paypal express checkout wizard. It will be helpful if some one points me to correct direction.

require_once ("paypalfunctions.php");

$paymentAmount = 15;

$currencyCodeType = "GBP";
$paymentType = "Sale";
$returnURL = "http://www.mysite.com/paypal/confirm.php";
$cancelURL = "http://www.mysite.com/paypal/index.php";
$resArray = CallShortcutExpressCheckout ($paymentAmount, $currencyCodeType,            $paymentType, $returnURL, $cancelURL);
$ack = strtoupper($resArray["ACK"]);
if($ack=="SUCCESS")
{
RedirectToPayPal ( $resArray["TOKEN"] );

} 

推荐答案

由于您没有传递所谓的订单项详细信息"(产品数据)，因此 PayPal 不会显示总金额.

// Total amount of the purchase, incl shipping, tax, etc  
PAYMENTREQUEST_0_AMT=300.0  
// Total amount of items purchased, excl shipping, tax, etc     
PAYMENTREQUEST_0_ITEMAMT=300.0  
// Authorize the funds first (Authorization), or capture immediately (Sale)?    
PAYMENTREQUEST_0_PAYMENTACTION=Sale  
// First item  
L_PAYMENTREQUEST_0_NAME0=Item1  
L_PAYMENTREQUEST_0_QTY0=1  
L_PAYMENTREQUEST_0_AMT0=100.00  
// Second item  
L_PAYMENTREQUEST_0_NAME1=Item2  
L_PAYMENTREQUEST_0_QTY1=1  
L_PAYMENTREQUEST_0_AMT1=200.00