Php 我的paypal express结帐付款有问题吗？

我是paypal express收银台的新手，我有这个代码来支付paypal

$resArray = CallShortcutExpressCheckout ($paymentAmount, $currencyCodeType, $paymentType, $returnURL, $cancelURL);
$ack = strtoupper($resArray["ACK"]);
if($ack=="SUCCESS" || $ack=="SUCCESSWITHWARNING")
{
    RedirectToPayPal ( $resArray["TOKEN"] );
} 
else  
{
    //Display a user friendly Error on the page using any of the following error information returned by PayPal
    $ErrorCode = urldecode($resArray["L_ERRORCODE0"]);
    $ErrorShortMsg = urldecode($resArray["L_SHORTMESSAGE0"]);
    $ErrorLongMsg = urldecode($resArray["L_LONGMESSAGE0"]);
    $ErrorSeverityCode = urldecode($resArray["L_SEVERITYCODE0"]);

    echo "SetExpressCheckout API call failed. ";
    echo "Detailed Error Message: " . $ErrorLongMsg;
    echo "Short Error Message: " . $ErrorShortMsg;
    echo "Error Code: " . $ErrorCode;
    echo "Error Severity Code: " . $ErrorSeverityCode;
}

这是CallShortcutExpressCheckout函数的代码

function CallShortcutExpressCheckout( $paymentAmount, $currencyCodeType, $paymentType, $returnURL, $cancelURL) 
    {
        //------------------------------------------------------------------------------------------------------------------------------------
        // Construct the parameter string that describes the SetExpressCheckout API call in the shortcut implementation

        $nvpstr="&PAYMENTREQUEST_0_AMT=". $paymentAmount;
        $nvpstr = $nvpstr . "&PAYMENTREQUEST_0_PAYMENTACTION=" . $paymentType;
        $nvpstr = $nvpstr . "&RETURNURL=" . $returnURL;
        $nvpstr = $nvpstr . "&CANCELURL=" . $cancelURL;
        $nvpstr = $nvpstr . "&PAYMENTREQUEST_0_CURRENCYCODE=" . $currencyCodeType;

        $_SESSION["currencyCodeType"] = $currencyCodeType;    
        $_SESSION["PaymentType"] = $paymentType;

        //'--------------------------------------------------------------------------------------------------------------- 
        //' Make the API call to PayPal
        //' If the API call succeded, then redirect the buyer to PayPal to begin to authorize payment.  
        //' If an error occured, show the resulting errors
        //'---------------------------------------------------------------------------------------------------------------
        $resArray=hash_call("SetExpressCheckout", $nvpstr);
        $ack = strtoupper($resArray["ACK"]);
        if($ack=="SUCCESS" || $ack=="SUCCESSWITHWARNING")
        {
            $token = urldecode($resArray["TOKEN"]);
            $_SESSION['TOKEN']=$token;
        }

        return $resArray;
    }

我的问题是，我不知道如何发送购物车的完整信息，如产品标题和代码，这是我需要的，因为我没有订单部分到我的购物车，我想通过电子邮件管理一切

---

因此，我需要的是通过订单发送产品说明，一旦收到订单电子邮件确认，我就要做同样的事情

首先，我要说，我已经试着让整个结账工作了2天，但我仍然没有完全成功：(

然而，看起来我比你更进一步

虽然不确定这是不是正确的方法，但我会告诉你我现在得到了什么以及我还有什么问题

我所做的是：

如果用户单击checkout按钮，将调用一个php文件（我们称之为

checkout.php

）

在

checkout.php

文件中，我用用户想要订购的物品构建了一个

数组

// fill array with two products
// normally you would loop through all products in the basket to create this array
$items = array('L_PAYMENTREQUEST_0_NAME0'=>'Productname 1',
               'L_PAYMENTREQUEST_0_NUMBER0'=>'Productcode 1',
               'L_PAYMENTREQUEST_0_DESC0'=>'Productdescription 1',
               'L_PAYMENTREQUEST_0_AMT0'=>39.99, // price per unit
               'L_PAYMENTREQUEST_0_QTY0'=>2, // quantity
               'L_PAYMENTREQUEST_0_NAME1'=>'Productname 2',
               'L_PAYMENTREQUEST_0_NUMBER1'=>'Productcode 2',
               'L_PAYMENTREQUEST_0_DESC1'=>'Productdescription 2',
               'L_PAYMENTREQUEST_0_AMT1'=>200.99,
               'L_PAYMENTREQUEST_0_QTY1'=>1,
               );

// set total amount of order in session (this will be used by paypal throughout the payment process)
$_SESSION['Payment_Amount'] = 280.97;

// now normally call CallShortcutExpressCheckout only with the addition of the $items array
$resArray = CallShortcutExpressCheckout ($paymentAmount, $currencyCodeType, $paymentType, $returnURL, $cancelURL, $items);

现在，对于包含实际向PayPal发出请求的函数的文件：

我创建了一个额外的函数（
generate\u nvp\u string
），并将
CallShortcutExpressCheckout
函数更改为使用此字符串

function generate_nvp_string($paymentAmount, $currencyCodeType, $paymentType, $returnURL, $cancelURL, $items = array())
{
    $params = array('PAYMENTREQUEST_0_AMT'=>$paymentAmount,
                    'PAYMENTREQUEST_0_PAYMENTACTION'=>$paymentType,
                    'RETURNURL'=>$returnURL,
                    'CANCELURL'=>$cancelURL,
                    'PAYMENTREQUEST_0_CURRENCYCODE'=>$currencyCodeType,
                    );

    $params = array_merge($params, $items);

    $nvp_string = '';
    foreach($params as $name => $value) {
        $nvp_string.= '&'.$name.'='.$value;
    }

    return $nvp_string;
}

function CallShortcutExpressCheckout($paymentAmount, $currencyCodeType, $paymentType, $returnURL, $cancelURL, $items= array())
{
    $_SESSION['currencyCodeType'] = $this->currency;
    $_SESSION['PaymentType'] = $this->payment_type;

    $result = $this->hash_call('SetExpressCheckout', $this->generate_nvp_string($paymentAmount, $currencyCodeType, $paymentType, $returnURL, $cancelURL, $items));

    $ack = strtoupper($result['ACK']);
    if ($ack == 'SUCCESS' || $ack == 'SUCCESSWITHWARNING') {
        $_SESSION['TOKEN'] = urldecode($result['TOKEN']);
    }

    return $result;
}

现在，当用户单击checkout按钮时，请求字符串也将包括产品。当用户被重定向到PayPal checkout时，他们将对所有订购的产品有一个很好的概述

我从以下几点开始回答：

我还有一个问题

但是，当用户完成签出过程并被重定向回我的站点（
$returnURL
）并且由于某种原因无法获得交易ID时，签出过程现在似乎可以工作了

交易ID对于能够在后端进一步处理付款非常重要。
我试图使用表单提交来循环项目。PayPal的示例代码仅适用于1个项目。我没有创建类似PeeHaa的函数，而是检查是否设置了L_PAYMENTREQUEST_0_NAME0，如果设置了，则将所有变量添加到$nvpstr字符串。然后继续，查看是否设置了L_PAYMENTREQUEST_0_NAME1，如果设置了，请将其添加到字符串中，等等。以下是需要它的任何人的代码：

for($i=0; $i<99999; $i++){
    if(isset($paramsArray["L_PAYMENTREQUEST_0_NAME$i"])){
        $nvpstr = $nvpstr . "&L_PAYMENTREQUEST_0_NAME$i=" . $paramsArray["L_PAYMENTREQUEST_0_NAME$i"];
    }
    if(isset($paramsArray["L_PAYMENTREQUEST_0_NUMBER$i"])){
        $nvpstr = $nvpstr . "&L_PAYMENTREQUEST_0_NUMBER$i=" . $paramsArray["L_PAYMENTREQUEST_0_NUMBER$i"];
    }
    if(isset($paramsArray["L_PAYMENTREQUEST_0_DESC$i"])){
        $nvpstr = $nvpstr . "&L_PAYMENTREQUEST_0_DESC$i=" . $paramsArray["L_PAYMENTREQUEST_0_DESC$i"];
    }
    if(isset($paramsArray["L_PAYMENTREQUEST_0_AMT$i"])){
        $nvpstr = $nvpstr . "&L_PAYMENTREQUEST_0_AMT$i=" . $paramsArray["L_PAYMENTREQUEST_0_AMT$i"];
    }
    if(isset($paramsArray["L_PAYMENTREQUEST_0_QTY$i"])){
        $nvpstr = $nvpstr . "&L_PAYMENTREQUEST_0_QTY$i=" . $paramsArray["L_PAYMENTREQUEST_0_QTY$i"];
    }
    if(!isset($paramsArray["L_PAYMENTREQUEST_0_NAME$i"])){
        break;
    }
}

$i=0；$i的