This script needs to be fired once every category page view. Again, the variables ({{name}}, {{sku}}, etc.) mentioned below need to be dynamically filled with the data of the item.
<script type="text/javascript">
_paq.push(['setEcommerceView',
false,
false,
"{{categoryname}}"
]);
_paq.push(['trackPageView']);
</script>
Category view script example
<script>
_paq.push(['setEcommerceView',
false,
false,
"Adventure Books"
]);
_paq.push(['trackPageView']);
</script>