Hi guys! I know basic php but whilst coding the site I'm currently working on I ran into a problem. Basically, I need information on how to make a secure IPN for sending back user information (first name, last name, email, somerandominfo) to my server. I understand the basics of the system but am having difficulties understanding the specific details regarding the ipn. As I said I have PHP knowledge, but can't really build things I don't understand. Please respond!

Hi there. I have a similar problem. In my return page I have this code

$req = 'cmd=_notify-synch';

$tx_token = $_GET['tx'];

$auth_token = "ifdjnhgeki";//not the real one

$req .= "&tx=$tx_token&at=$auth_token";

// 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";
$fp = fsockopen ('www.sandbox.paypal.com', 80, $errno, $errstr, 30);[/code][/code]
etc..etc..

But the return value is always FAIL. What could be the possible cause?
My php is SSL enabled