Sorry about that, let's just check the FedEx then:
<?php
if(!session_id()) session_start();
echo("Paypal Full Request :<br />");
echo("<code>".isset($_SESSION["WA_Store_Cart_FedEx_FullRequest"])?$_SESSION["WA_Store_Cart_FedEx_FullRequest"]:""."</code><br /><br /><br />");
echo("Fedex Full Response :<br />");
echo("<code>".isset($_SESSION["WA_Store_Cart_FedEx_FullResponse"])?$_SESSION["WA_Store_Cart_FedEx_FullResponse"]:""."</code><br /><br />");
?>