Location: PHPKode > scripts > EncapsGallery > encapsgallery/shopcart_ipn.php
<?php 
include("common.ini.php");
$cart = new ShopCart($db,$config);

/*$fp = fopen(dirname(__FILE__)."/shopcart_ipn.out","w");
fputs($fp,"\n\n".date("r"));
foreach ($_POST as $key => $value)
    fputs($fp,"\n$key=$value");
fclose($fp);
//return;*/

		// read the post from PayPal system and add 'cmd'
		$req = 'cmd=_notify-validate';
		foreach ($_POST as $key => $value) 
		{
			$value = urlencode(stripslashes($value));
			$req .= "&$key=$value";
		}

		// post back to PayPal system to validate
		$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";
		if($config["shopcart_paypal_sandbox"])
			$fp = fsockopen ('www.sandbox.paypal.com', 80, $errno, $errstr, 30);
		else
			$fp = fsockopen ('www.paypal.com', 80, $errno, $errstr, 30);
		
		// assign posted variables to local variables
		$item_name = $_POST['item_name'];
		$item_number = $_POST['item_number'];
		$payment_status = $_POST['payment_status'];
		$payment_amount = $_POST['mc_gross'];
		$payment_currency = $_POST['mc_currency'];
		$txn_id = $_POST['txn_id'];
		$receiver_email = $_POST['receiver_email'];
		$payer_email = $_POST['payer_email'];
		
		if (!$fp) 
		{
			// HTTP ERROR
		} 
		else 
		{
			fputs ($fp, $header . $req);
			$VERIFIED = "";
			while (!feof($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 = $res;
				}
				else if (strcmp ($res, "INVALID") == 0) 
				{
					// log for manual investigation
					$VERIFIED = $res;
				}
			}
			fclose ($fp);

	$cart->ipn($_POST,$VERIFIED);
}
?>
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