Custom events can be inserted into layouts to start counting events on a per-creative basis, and/or added to line items as part of CPA (cost per action) campaigns.
How to create and use custom events.
Name and description: Give the event a name and description (optional) of your choice.
Value type determines what is counted, and you can choose between number (for example the number of events or conversions), time in milliseconds or seconds (for example, the seconds a user holds the cursor over an ad), or money (for example the value of a purchase online).
Custom event example
ID and code example: Once you've created your event, you can paste the code with the ID into a Layout to start counting events.
Once you have created a custom event you will also find it as a conversion event when adding a CPA bid to the line item.