AutoAuth not working

[zeeshan]

Hi I am working on WHMCS and I am using AutoAuth according to their document http://docs.whmcs.com/AutoAuth

 

And I have created a new page using this http://docs.whmcs.com/Creating_Pages

and on that page i want to use AutoAuth

 

<?php

# Define WHMCS URL & AutoAuth Key
$whmcsurl = "http://demo.whmcs.com/dologin.php"(mysite url different);
$autoauthkey = "**************";

$timestamp = time(); # Get current timestamp
$email = "demo@whmcs.com"(custom email address); # Clients Email Address to Login
$goto = "clientarea.php?action=products";

$hash = sha1($email.$timestamp.$autoauthkey); # Generate Hash

# Generate AutoAuth URL & Redirect
$url = $whmcsurl."?email=$email&timestamp=$timestamp&hash=$hash&goto=".urlencode($goto);
header("Location: $url");
exit;

?>

 

But there comes an error Login details incorrect I tried this on my two servers but it did not work on both.