Affiliate App download detail explanation

Explain, in detail, how a CPA app download offer is paid to a referring affiliate. I am looking for a 1 to 3 page narrative on how the following process works.... IOS...Amdroid... You send someone to the app store to download a game. What are the software actions that happen on their phone/tablet? The app is downloaded... fine, but... 1. What is also downloaded/installed on the phone/tablet to notify the app producer that an app has been downloaded and then installed? 2. How is the app producer notified that the required app actions have been met on the new user's phone/tablet so that I get paid? 3. How can I get a copy of the app producer's notification code so I can download/install it along with the app code and bypass the app store? I just want to automatically download the app to the phone/tablet and install the notification code so that when the required steps are taken by the new app user I get paid.