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    <p>I'd suggest doing some debugging using var_dump and Paypal's test tool located here: <a href="https://developer.paypal.com/cgi-bin/devscr?cmd=_ipn-link-session" rel="nofollow">https://developer.paypal.com/cgi-bin/devscr?cmd=_ipn-link-session</a></p> <p>I can understand it becomes difficult and time consuming when working with Third Party Services.</p> <p>It may be worth simply grabbing the POST data, serializing it and applying it to a variable so you can test without PayPal hitting your callback.</p> <p>I'd do something like this initially to grab the PayPal POST.</p> <pre><code>&lt;?php file_put_contents(serialize($_POST), 'post.log'); //Now you have the post request serialized we can grab the contents and apply it to a variable for fast testing. ?&gt; </code></pre> <p>Start of your code:</p> <pre><code>&lt;?php $_POST = unserialize(file_get_content('post.log')); //Now you can execute the script via command line or within your browser without requiring PayPal's testing tool. Use var_dump to investigate what's the issue. $request = "cmd=_notify-validate"; foreach ($_POST as $varname =&gt; $varvalue){ $email .= "$varname: $varvalue\n"; if(function_exists('get_magic_quotes_gpc') and get_magic_quotes_gpc()){ $varvalue = urlencode(stripslashes($varvalue)); } else { $value = urlencode($value); } $request .= "&amp;$varname=$varvalue"; } ?&gt; </code></pre> <p>NOW: This is a bit more effective and efficient when it comes to testing. In your example you were emailing yourself, but not including $result anywhere within the body of the mail function. <a href="http://php.net/manual/en/function.mail.php" rel="nofollow">http://php.net/manual/en/function.mail.php</a></p> <p>PayPal's IPN example uses fsock, although CURL is more effective and easier to use. Also there have been some recent issues with PayPal's sandbox changing. <a href="https://www.paypal-community.com/t5/Selling-on-your-website/IPN-response-problem/m-p/519862/message-uid/519862#U519862" rel="nofollow">https://www.paypal-community.com/t5/Selling-on-your-website/IPN-response-problem/m-p/519862/message-uid/519862#U519862</a></p> <p>Also : To determine what the main cause is, as you've said it appears to be your LAMP stack. Check your logs directory (generally /var/log/) generally from their you'll be able to pinpoint what's failing.</p>
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    1. COI solved the problem, looks like paypal was having problems communicating via SSL to my server i put in the following line and it worked: curl_setopt($ch,CURLOPT_SSL_VERIFYPEER, false);
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