The Sklik PHP SDK by Michal Kuchta allows API interaction to access search advertising features. Library and examples available, in addition to a tutorial at https://github.com/niximor/php-sklik/blob/master/sklik_tutorial.php
Supermetrics has updated its the Supermetrics API. Supermetrics has always been about extracting data from marketing and advertising platforms for use in analytical tools. The new API expands on that vision and delivers more user friendly tools and abilities for custom solutions.