A click macro is a code string that DFP Small Business offers to help you track clicks on your custom and third-party ads.
You can use click macros in any of the following ways:
For HTML creatives, insert the macro before the clickthrough URL of the creative, and at the beginning of all action and HREF attributes.
For rich media creatives, most creative vendors will offer a placeholder in their tag to insert click macros. For more information about placing click macros properly in your third-party ads, please contact the vendor that created your ads.
See the custom creative macro troubleshooting article for more information.