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所以我使用的是貝寶提供的示例代碼，以正確溝通和驗證傳入的IPN消息。使用提供的Paypal開發者工具「IPN模擬器」，我可以確認我的IPN監聽器代碼能夠成功與PayPal服務器握手，但是當需要重新發送驗證信息時，我只能成功地與非-sandbox版本的貝寶（無論如何返回無效，因爲一切都設置爲與沙箱貝寶的溝通）。當我嘗試連接到沙箱版本時，收到一個http錯誤，表示我無法連接到服務器。貝寶IPN響應適用於貝寶而不是沙箱 - 貝寶？
我想我已經分離出的問題這行代碼：
$fh = fsockopen ('ssl://www.sandbox.paypal.com', 443, $errno, $errstr, 30); //HTTP error
下面的代碼演示了我的測試，看看哪些網址可以工作：
$fh = fsockopen ('ssl://www.paypal.com', 443, $errno, $errstr, 30);//works, returns invalid
$fh = fsockopen ('tls://www.paypal.com', 443, $errno, $errstr, 30);//works, returns invalid
$fh = fsockopen ('www.paypal.com', 443, $errno, $errstr, 30);//Does not work but does not throw HTTP Error (does not return Verified or Invalid either)
$fh = fsockopen ('ssl://www.sandbox.paypal.com', 443, $errno, $errstr, 30);//HTTP error
$fh = fsockopen ('tls://www.sandbox.paypal.com', 443, $errno, $errstr, 30);//HTTP error
$fh = fsockopen ('www.sandbox.paypal.com', 443, $errno, $errstr, 30);//Does not work but does not throw HTTP Error (does not return Verified or Invalid either)
這裏是我的IPN監聽器的代碼目前在我的服務器上（爲了簡單起見，在我的數據庫中記錄IPN數據的附加代碼未顯示;這裏也是此代碼基於的鏈接）：
<?php
// STEP 1 - acknowledge PayPal's notification
header('HTTP/1.1 200 OK');
// STEP 2 - create the response we need to send back to PayPal for them to confirm that it's legit
$resp = 'cmd=_notify-validate';
foreach ($_POST as $parm => $var)
{
$var = urlencode(stripslashes($var));
$resp .= "&$parm=$var";
}
// STEP 3 - Get the HTTP header into a variable and send back the data we received so that PayPal can confirm it's genuine
$httphead = "POST /cgi-bin/webscr HTTP/1.1\r\n";
$httphead .= "Content-Type: application/x-www-form-urlencoded\r\n";
$httphead .= "Content-Length: " . strlen($resp) . "\r\n\r\n";
// Now create a ="file handle" for writing to a URL to paypal.com on Port 443 (the IPN port)
$errno ='';
$errstr='';
$fh = fsockopen ('ssl://www.sandbox.paypal.com', 443, $errno, $errstr, 30); //PROBLEM?
// STEP 4 - Nearly done. Now send the data back to PayPal so it can tell us if the IPN notification was genuine
if (!$fh) {
// Uh oh. This means that we have not been able to get thru to the PayPal server. It's an HTTP failure
}
// Connection opened, so spit back the response and get PayPal's view whether it was an authentic notification
else {
fputs ($fh, $httphead . $resp);
while (!feof($fh))
{
$readresp = fgets ($fh, 1024);
// $readresp = trim($readresp);
if (strcmp ($readresp, "VERIFIED") == 0) //yay verified data!
{
}
else if (strcmp ($readresp, "INVALID") == 0) //Invalid data! :(
{
}
}
fclose ($fh);
}
?>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<title></title>
</head>
<body>
</body>
</html>
這裏是我的按鈕代碼：
<form action="https://www.sandbox.paypal.com/cgi-bin/webscr" method="post" target="_top">
<input type="hidden" name="cmd" value="_s-xclick">
<input type="hidden" name="hosted_button_id" value="M8IC3G88S5WFQ">
<input type="image" src="https://www.sandbox.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.sandbox.paypal.com/en_US/i/scr/pixel.gif" width="1" height="1">
</form>
什麼fsockopen()配置我應該使用任何幫助嗎？