Tracking Clickbank Sales into Google Analytics E-Commerce

cb-thanks.php

<?php 
$cb_item=$_REQUEST['item'];
$cb_affiliate=$_REQUEST['cbaffi'];
$cb_receipt=$_REQUEST['cbreceipt'];
$cb_cname=$_REQUEST['cname'];
$cb_cemail=$_REQUEST['cemail'];
$cb_ccountry=$_REQUEST['ccountry'];

$net_amount = 19.97;
if($cb_affiliate!='0') $net_amount = 0.3*$net_amount;
?>

<script type="text/javascript">
  var _gaq = _gaq || [];
  _gaq.push(['_setAccount', 'UA-XXXXXXX-XX']);
  _gaq.push(['_trackPageview']);

  _gaq.push(['_addTrans',
    '<?php echo $cb_receipt; ?>', // order ID - required
    'XXXXXXXX',                   // affiliation or store name
    '<?php echo $net_amount; ?>', // total - required
    '0',                          // tax
    '0',                          // shipping
    'Any',                        // city
    'Any',                        // state or province
    '<?php echo $cb_ccountry; ?>' // country
  ]);

  _gaq.push(['_addItem',
    '<?php echo $cb_receipt; ?>', // order ID - required
    '999',                        // SKU/code - required.
    'XXXXXXXXXXX',                // product name
    'ebook',                      // category or variation
    '<?php echo $net_amount; ?>', // unit price - required
    '1'                           // quantity - required
  ]);
  _gaq.push(['_trackTrans']); //submits transaction to the Analytics servers

  (function() {
    var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
    ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
    var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
  })();
</script>