The purpose of this type of tracking is to run custom reporting on actionable elements within templates, like the number of clicks on an Offer template card's clickable element.
Any actionable (clickable) element within Offer templates has the opportunity to have a tracking code tied to it. This code is logged anytime a user (known or anonymous) clicks on that element and allows you further click tracking.
The code can consist of anything that clearly states the action being taken. For example, the first offer card button can have an external event of offer-button-1.
The external event is placed within the actionable element's tag like this:
<button ng-click="startCheckout()" external-event="offer-button-1"></button>
Our data team will be able to pull custom reports that include these external-event stats. Also, you will see the number of clicks on an offer template within the Composer Conversion report under "Clicks". Please contact your Account manager for further information about this.