I'm not receiving a response from Paypal's IPN Sandbox

[Davo789]

I'm putting a paypal checkout onto my website but am falling down with the listener.

My code is able to receive the info from paypal, add on the extras and post it back. However, I get no response from the Sandbox saying either 'VERIFIED' or 'INVALID'. I've pretty much copied my code from the paypal website so I was hoping this was going to be fairly straightforward, so if you could take a minute to look at my code, perhaps some new eyes could pick out where I've gone wrong.

Here's the code. Nothing special, it literally just gets the info, adjusts it, passes it back and reads the response (which it either isn't getting or doesn't realise it's getting)

<?php

$debug=true;

//Put together postback info

$postback = 'cmd=_notify-validate';

foreach($_POST as $key =>$value){
$postback .= "&$key=$value";
}

// build the header string to post back to PayPal system to validate
$header = "POST /cgi-bin/webscr HTTP/1.1\r\n";
$header .= "Host: www.sandbox.paypal.com\r\n";
$header .= "Content-Type: application/x-www-form-urlencoded\r\n";
$header .= "Content-Length: " . strlen($postback) . "\r\n\r\n";

$fp = fsockopen ('www.sandbox.paypal.com', 80, $errno, $errstr, 30);//open the connection

if(!$fp){ //no conn
die();
}

//post data back
fputs($fp, $header . $postback);

while(!feof($fp)){

$res=fgets ($fp, 1024);

if((strcmp($res, "VERIFIED")) == 0){ //verified!
if($debug){
$filename = 'debug/debug5_verified.txt'; //create a file telling me we're verified
$filehandle=fopen($filename, 'w');
fwrite($filehandle,'VERIFIED!');
fclose($filehandle);
}
}
}

?>

Thanks in advance!

[Misty11]

Hello Davo789,

I am sure if new eyes look at your code they surely can help you pick out where you have gone wrong. There may be some useful information about it in the PayPal Developer Forum. That’s where discussion about sandbox accounts takes place, and the people there are in the best position to offer you suggestions.

Misty

[PayPal_RobG]

Hello Dave,

Please change:

$fp = fsockopen ('www.sandbox.paypal.com', 80, $errno, $errstr, 30)

To:

$fp = fsockopen ('ssl://www.sandbox.paypal.com', 443, $errno, $errstr, 30)

As per Bulletin: IP address expansion for PayPal services you need to post back over SSL to us.