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我正在寻找如何使用过去2周内的PayPal IPN（即时付款通知），并且无法理解如何在我的代码中使用它。PayPal支付验证，IPN如何工作
我使用下面的HTML代码来创建一个PayPal按钮
button.html
<form name="paypalForm" action="paypal.php" method="post">
<input type="hidden" name="id" value="123">
<input type="hidden" name="CatDescription" value="20Percents (12 Credits)">
<input type="hidden" name="payment" value="10">
<input type="hidden" name="key" value="<? echo md5(date("Y-m-d:").rand()); ?>">
<input TYPE="image" SRC="http://www.coachsbr.com/images/site/paypal_button.gif" name="paypal" value="Payment via Paypal" >
</form>
而且，下面的代码来处理支付和验证
贝宝.php
<?php
require_once('paypal.class.php'); // include the class file
$p = new paypal_class; // initiate an instance of the class
$p->paypal_url = 'https://www.sandbox.paypal.com/cgi-bin/webscr'; // testing paypal url
//$p->paypal_url = 'https://www.paypal.com/cgi-bin/webscr'; // paypal url
// setup a variable for this script (ie: 'http://www.micahcarrick.com/paypal.php')
$this_script = 'http://'.$_SERVER['HTTP_HOST'].$_SERVER['PHP_SELF'];
// if there is not action variable, set the default action of 'process'
if (empty($_GET['action'])) $_GET['action'] = 'process';
switch ($_GET['action']) {
case 'process': // Process and order...
$CatDescription = $_REQUEST['CatDescription'];
$payment = $_REQUEST['payment'];
$id = $_REQUEST['id'];
$key = $_REQUEST['key'];
$p->add_field('business', '[email protected]');
$p->add_field('return', $this_script.'?action=success');
$p->add_field('cancel_return', $this_script.'?action=cancel');
$p->add_field('notify_url', $this_script.'?action=ipn');
$p->add_field('item_name', $CatDescription);
$p->add_field('amount', $payment);
$p->add_field('key', $key);
$p->add_field('item_number', $id);
$p->submit_paypal_post(); // submit the fields to paypal
//$p->dump_fields(); // for debugging, output a table of all the fields
break;
case 'success': // Order was successful...
echo "<br/><p><b>Payment Successful.</b><br /></p>";
foreach ($_POST as $key => $value) { echo "$key: $value<br>"; }
break;
case 'cancel': // Order was canceled...
echo "<br/><p><b>The order was canceled!</b></p><br />";
foreach ($_POST as $key => $value) { echo "$key: $value<br>"; }
break;
case 'ipn': // Paypal is calling page for IPN validation...
if ($p->validate_ipn()) {
// For this example, we'll just email ourselves ALL the data.
$dated = date("D, d M Y H:i:s", time());
$subject = 'Instant Payment Notification - Recieved Payment';
$to = '[email protected]'; // your email
$body = "An instant payment notification was successfully recieved\n";
$body .= "from ".$p->ipn_data['payer_email']." on ".date('m/d/Y');
$body .= " at ".date('g:i A')."\n\nDetails:\n";
$headers = "";
$headers .= "From: Test Paypal \r\n";
$headers .= "Date: $dated \r\n";
$PaymentStatus = $p->ipn_data['payment_status'];
$Email = $p->ipn_data['payer_email'];
$id = $p->ipn_data['item_number'];
if($PaymentStatus == 'Completed' or $PaymentStatus == 'Pending'){
$PaymentStatus = '2';
}else{
$PaymentStatus = '1';
}
foreach ($p->ipn_data as $key => $value) { $body .= "\n$key: $value"; }
fopen("http://www.virtualphoneline.com/admins/TestHMS.php?to=".urlencode($to)."&subject=".urlencode($subject)."&message=".urlencode($body)."&headers=".urlencode($headers)."","r");
}
break;
}
?>
一个额外的类文件：（可以在这里找到）http://pastebin.com/auCdYhaR
的代码工作正常，但我现在有很大的问题，我想确认支付是否成功与否从以下行并执行操作（在会话中为用户添加10个信用点）。
case 'success': // Order was successful...
echo "<br/><p><b>Payment Successful.</b><br /></p>";
foreach ($_POST as $key => $value)
{
/*echo "$key: $value<br>";*/
// Do the required action, **add 10 credits in the database for the user on session**
}
break;
最后，问题是，当我在按钮页面重定向单击从button.html到Paypal.php页面，当我进入我的PayPal登录信息，付款成功后，
，有那么小的小文本 - >返回发件人的网站我需要点击它，当我点击它，它会返回给我带来PAYPAL.PHP页面，然后在CASE 'SUCCESS'被激发。如果我付款并且只是关闭PayPal页面而没有点击返回到SENDER的网站并且没有等到页面PAYPAL.PHP LOADS网站不能验证付款并且不能添加信用。
我如何可以自动完成这一过程并添加学分UPON 成功付款不是在成功返回页面PAYPAL.PHP。
感谢