page_events
The
page_events permissions allows your app permission to log events on behalf of Facebook Pages administered by people using your app and to send those events to Facebook for ads targeting, optimization and reporting. The allowed usage for this permission is to send businesses related activities (for example purchase, add-to-cart, lead) on behalf of Pages owned by the people who use your app. You may also use this permission to request analytics insights to improve your app and for marketing or advertising purposes, through the use of aggregated and de-identified or anonymized information (provided such data cannot be re-identified).