Track facebook conversion value

Greetings, I would like to know the conversion value of my facebook ads campaign.

Part of the conversion code allow us to input the value of the conversion, however this value should be taken from the cart, rather than be written by us. Do you have any idea on how to solve this?

Thanks

window._fbq = window._fbq || [];
window._fbq.push(['track', 'xxxxxxx', {'value':'0.01','currency':'USD'}]);
</script>
<noscript><img height="1" width="1" alt="" style="display:none" src="https://www.facebook.com/tr?ev=xxxxxxxx ... rency]=USD[/highlight]&noscript=1" /></noscript>

anyone?

Maybe this link wil help

http://forum.opencart.com/viewtopic.php?t=121908

thanks! the link looks good. I will test it right now!