Php 使用信用卡付款时Paypal IPN无效

我正在使用php和paypal创建一个预订系统。现在用沙箱测试

当我尝试使用test buy帐户付款时，IPN为“有效”，但当尝试使用信用卡测试付款时，IPN返回“无效”

为什么呢

所有字段都正确接收到IPN脚本页面

检查付款时，我的paypal沙箱帐户正确收到付款

代码如下：

$req = 'cmd=_notify-validate';
foreach ($_POST as $key => $value) {
    $value = urlencode(stripslashes($value));
    $req.= "&$key=$value";
    $ipn_content.= "$key=$value";
}

// post back to PayPal system to validate
$header="";
$header .= "POST /cgi-bin/webscr HTTP/1.0\r\n";
$header .= "Content-Type: application/x-www-form-urlencoded\r\n";
$header .= "Content-Length: " . strlen($req) . "\r\n\r\n";
$fp = fsockopen('ssl://www.sandbox.paypal.com', 443, $errno, $errstr, 30);


$VERIFIED=FALSE;

if (!$fp) {
// HTTP ERROR
} else {

    fputs ($fp, $header . $req);
    while (!feof($fp)) {
        $res = fgets ($fp, 1024);
        if (strcmp ($res, "VERIFIED") == 0) {
            // check the payment_status is Completed
            // check that txn_id has not been previously processed
            // check that receiver_email is your Primary PayPal email
            // check that payment_amount/payment_currency are correct
            // process payment
            $VERIFIED=TRUE;
        }else if (strcmp ($res, "INVALID") == 0) {
            // log for manual investigation
        }

    }           

}
fclose ($fp);

echo $VERIFIED;

if($VERIFIED!=TRUE){
    exit;
}

//continue.......

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贝宝信用卡支付似乎没有发送$res变量。 请改用Payment_status post变量

$payment_status = $_POST['payment_status'];
if (strcmp ($payment_status, "Completed") == 0){
   //ok
} else {
   //not ok
}

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您的答案看起来与给出的代码完全无关。