Add Intercom.io snippet to Magento site

gistfile1.php

<?php 
/*
 *   /app/design/frontend/default/your_theme/template/page/intercom-io.phtml 
 */

// Settings for the intercom.io app.

if( $this->helper('customer')->isLoggedIn() ): ?>
	  <?php $customer = Mage::helper('customer')->getCustomer()->getData(); ?>
	  <script id="IntercomSettingsScriptTag">
	  var intercomSettings = {
	    app_id: 	'your_app_id',
	    email: 	"<?php echo $customer['email']; ?>", 
	    name: 	"<?php echo $customer['firstname'] . ' ' . $customer['lastname']; ?>",
	    user_id: 	"<?php echo $customer['entity_id']; ?>",
	    created_at: <?php echo time( $customer['created_at'] ); ?> 
	  };
	
	  (function() {
	    var i=function(){i.c(arguments)};i.q=[];
	    i.c=function(args){i.q.push(args)};window.Intercom=i;
	    function async_load() {
	      var s = document.createElement('script');
	      s.type = 'text/javascript'; s.async = true;
	      s.src = 'https://api.intercom.io/api/js/library.js';
	      var x = document.getElementsByTagName('script')[0];
	      x.parentNode.insertBefore(s, x);
	    }
	    if (window.attachEvent) {
	      window.attachEvent('onload', async_load);
	    } else {
	      window.addEventListener('load', async_load, false);
	    }
	  })();
	</script>
<?php endif; ?>

/* 
 *  This goes in the theme's layout/local.xml file (in the <default> section)
 *  - it could also go into the page.xml file...
 */
 <reference name="before_body_end">
    <block type="core/template" template="page/intercom-io.phtml" />
 </reference>