How do I get Adwords extension stats eg clicks, impression with AdWords API [PHP]

[vishvend...@icrushiflush.com]

I tried to find but not found any relevent code example but the code to make change in the extensions. Please help me to find out how can I fetch clicks and impression from AdWords API using PHP. I am using `googleads-php-lib`. 

There is one example for javascript https://developers.google.com/adwords/scripts/docs/features/ad-extensions but found none for php.