Hi there,
To understand this, it would be best if you could go over the current set up that you have for this site.
In case you have conversion mboxes set up for this site on the landing pages of "Learn More" and "Buy Now," then we would not have to indulge in click tracking, just a simple campaign with different banners as different experiences and "Buy Now" page mbox and "Learn More" page mbox as conversion mboxes will work. This appraoch would be much simpler.
However, in case you do not have any mboxes set up for conversion, and it is not possible to make this change, then within the HTML offers, you would have to include the HTML of that offer with the anchor tags that would fire the script for click tracking. The script would look something like the following:
<script type="text/javascript">
mboxDefine("dynamicElement", "mbox_dynamic", "parameter1=value1");
mboxUpdate("mbox_dynamic", "parameter1=value1");
</script>
Let me know if there are any concerns.
Thanks,