Documentation of GAM Click 

Macro: https://support.google.com/adxbuyer/answer/3187721?hl=en  NOTE: If no other instructions are given we will insert the %%CLICK_URL_UNESC%% macro described in the GAM documentation linked above.For us to be able to track click count in GAM we need to be able to insert a click macro into the script tag. We would like you to always deliver thescript with a placeholder for where to insert our click macro with the following format: 

click="[Google_Click_Macro_Here]"

The name of the variable, `click=`, is not important to us,you can name it whatever you like as long as the placeholder-name is very clear about where to insert the click macro.Preferably name the placeholder [Google_Click_Macro_Here] as in the example above.

 Example Third-Party script:   

<script language='JavaScript1.1' SRC="http://www.3rdpartydomain?key1=value1&key2=value2&cachebuster=[Cachebuster_Macro_Here]&click=[Google_Click_Macro_Here]"></script>