Adding Tracking Code??

I Need to add some code to track my conversions after payment through paypal and clickbank (using Spring metrics)

Where do I add the code?

Would it go directly on the thanks.php for clickbank and paypals ipn.php or elsewhere?

Is it ok to add the script below before all the other text in the thanks .html?/ (turned the first and last brackets around)

>script type='text/javascript'>
var _springMetq = _springMetq || [];
_springMetq.push(['id', '6161b319cf']);
(
function(){
var s = document.createElement('script');
s.type = 'text/javascript';
s.async = true;
s.src = ('https:' == document.location.protocol ? 'https://d3rmnwi2tssrfx.cloudfront.net/a.js' : 'http://static.springmetrics.com/a.js');
var x = document.getElementsByTagName('script')[0];
x.parentNode.insertBefore(s, x);
}
)();
</script<

Thanks....