Can I run Google Analytics tracking code within a PHP web service script...???

I'm trying to get Google Analytics E-Commerce and AdWords Conversion Tracking configured for my web site and I'm having some issues.  

I'm using PayPal's IPN (instant payment notification) system to process orders and I've got the analytics code dynamically generated within this script.  

I was a little worried at first that because the code is included in a page that never actually loads in a browser that might be the problem.  However, I found the following link that seems to prove otherwise:

http://books.google.com/books?id=eio4QY-wrEkC&pg=PA259&lpg=PA259&dq=paypal+ipn+adwords+conversion&source=bl&ots=htQ1hqeJ-2&sig=14lZc7DIYmrnWQK1NEclN5HamQY&hl=en&ei=PvQOSvTFJ4KMtgfRr7SNCA&sa=X&oi=book_result&ct=result&resnum=3#PPA259,M1

I've attached the PHP code that generates all of my google tracking code here.  I'm afraid I'm a dummy and I deleted the samples I had in my email box so I'll have to wait on some new orders to provide fresh samples of what actually gets generated from this code, however, I can tell you that when comparing it to Google's samples (http://www.google.com/support/googleanalytics/bin/answer.py?hl=en&answer=76305#ecommerce) it's the same.  Nothing shows up in my Analytics E-Commerce or AdWords conversion areas though.

Any information on how I can get this working would be greatly appreciated.  Thanks!!!

<?php
# Google Analytics E-Commerce Tracking Code
if(!$sandbox && $google_analytics_ecommerce && strtolower($payment_status) == 'completed')
{
	$js_output = '<script type="text/javascript">
			var gaJsHost = (("https:" == document.location.protocol) ? "https://ssl." : "http://www.");
			document.write(unescape("%3Cscript src=\'" + gaJsHost + "google-analytics.com/ga.js\' type=\'text/javascript\'%3E%3C/script%3E"));
			</script>
			
			<script type="text/javascript">
			  var pageTracker = _gat._getTracker("' . $google_analytics_id . '");
			  pageTracker._trackPageview();
			  pageTracker._addTrans(
				"' . $invoice . '",           // Order ID
				"",                            // Affiliation
				"' . $mc_gross . '",           // Total
				"' . $tax . '",                // Tax
				"' . $shipping . '",           // Shipping
				"' . $address_city . '",       // City
				"' . $address_state . '",      // State
				"' . $address_country . '"     // Country
			  );';
		
	foreach($cart_items as $cart_item)
	{
		$js_output .= 'pageTracker._addItem(
				"' . $invoice . '",                                     // Order ID
				"' . $cart_item['item_number'] . '",                     // SKU
				"' . $cart_item['item_name'] . '",                       // Product Name 
				"",                            							 // Category
				"' . $cart_item['mc_gross'] . '",                        // Price
				"' . $cart_item['quantity'] . '"                         // Quantity
			  );';		
	}
			
	$js_output .= 'pageTracker._trackTrans();
			</script>';
			
	echo $js_output . chr(10) . chr(10);
}
 
$js_output_email = isset($js_output) ? $js_output : '';
 
# Google Analytics AdWords Conversion Tracking
if(!$sandbox && $google_adwords_conversions && strtolower($payment_status) == 'completed')
{
	$js_output = '<script language="JavaScript" type="text/javascript">
					<!--
					var google_conversion_id = ' . $google_adwords_conversion_id . ';
					var google_conversion_language = "en_US";
					var google_conversion_format = "3";
					var google_conversion_color = "ffffff";
					var google_conversion_label = "XNx1CM7GWBCmxJr2Aw";
					if (' . number_format($mc_gross,1) . ') {
					  var google_conversion_value = ' . number_format($mc_gross,1) . ';
					}
					//-->
					</script>
					<script language="JavaScript" src="https://www.googleadservices.com/pagead/conversion.js">
					</script>
					<noscript>
					<img height="1" width="1" border="0" src="https://www.googleadservices.com/pagead/conversion/' . $google_adwords_conversion_id . '/?value=' . number_format($mc_gross,1) . '&amp;label=XNx1CM7GWBCmxJr2Aw&amp;guid=ON&amp;script=0"/>
					</noscript>';
					
	echo $js_output;	
}
 
# Temp to see if this get reached
if(isset($js_output))
{
	$js_output_email .= $js_output;
	$mail -> Subject  =  'USBSwiper PayPal IPN : Google Analytics Code Ran';
	$mail -> Body =  $js_output_email;
	$mail -> AddAddress($admin_email_address, $admin_name);
	$mail -> Send();
	$mail -> ClearAddresses();	
}
?>

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