Problema IPN PayPal, Magento ed eBay

Se si usa PayPal per ricevere pagamenti da ebay e dal proprio sito  ecommerce  le notifiche ebay inviate a magento vengono respinte e le notifiche vengono disabilitate.
Ecco la soluzione :
Copy everything between the <-start-> and <-end-> in order to create your null_ipn.php file.
Paste this text into a file named null_ipn.php in the root of your Magento web folder.
Go to PayPal and log in.  Next, select "My Account" on the tab.

Next, navigate to profile -> My Selling Tools -> Instant Payment Notifications -> Edit Settings.
For the "Notification URL", use the file that you just created http://iltuodominio.com/null_ipn.php
That's it.



IPNs received by Magento will be posted to your Magento orders and IPNs received by the null listener will send back a success message to PayPal.

No more disabled IPN every few days.

Fonte: All American Hats

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// Revision Notes
// 11/04/11 - changed post back url from https://www.paypal.com/cgi-bin/webscr to https://ipnpb.paypal.com/cgi-bin/webscr
// For more info see below:
// https://www.x.com/content/bulletin-ip-address-expansion-paypal-services
// "ACTION REQUIRED: if you are using IPN (Instant Payment Notification) for Order Management and your IPN listener script is behind a firewall that uses ACL (Access Control List) rules which restrict outbound traffic to a limited number of IP addresses, then you may need to do one of the following:
// To continue posting back to https://www.paypal.com  to perform IPN validation you will need to update your firewall ACL to allow outbound access to *any* IP address for the servers that host your IPN script
// OR Alternatively, you will need to modify  your IPN script to post back IPNs to the newly created URL https://ipnpb.paypal.com using HTTPS (port 443) and update firewall ACL rules to allow outbound access to the ipnpb.paypal.com IP ranges (see end of message)."




// 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/1.1\r\n";
$header .= "Content-Type: application/x-www-form-urlencoded\r\n";
$header .= "Content-Length: " . strlen($req) . "\r\n\r\n";


   //If testing on Sandbox use:
 //$fp = fsockopen ('ssl://www.sandbox.paypal.com', 443, $errno, $errstr, 30);
$fp = fsockopen ('ssl://ipnpb.paypal.com', 443, $errno, $errstr, 30);


if (!$fp) {
// HTTP ERROR
} else {
fputs ($fp, $header . $req);
while (!feof($fp)) {
$res = fgets ($fp, 1024);
if (strcmp ($res, "VERIFIED") == 0) {
// check the payment_status is Completed
// check that txn_id has not been previously processed
// check that receiver_email is your Primary PayPal email
// check that payment_amount/payment_currency are correct
// process payment
// echo the response
echo "The response from IPN was: " .$res ."

";


//loop through the $_POST array and print all vars to the screen.


foreach($_POST as $key => $value){
        echo $key." = ". $value." ";
}
}
else if (strcmp ($res, "INVALID") == 0) {
// log for manual investigation


// echo the response
echo "The response from IPN was: " .$res ."";


  }


}
fclose ($fp);
}




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