An android game made on Unity3d has ads built in via the AdMob plugin. Plugin – a set of scripts that can be disabled by unchecking the checkbox of the script. You can make a button "disable ads" and click on it to disable the plugin.
Is it right to do this? And, in fact, the question itself: how to make this click paid?
Monetization in many games is carried out in exactly this way – by disabling ads. Do it right. To "make a click paid", you need to connect the Google API for purchases "in app purchase" (if you are going to upload to Google Play). Put a handler on the button that launches the purchase. Try searching "Andorid Unity3d In App Purchase Tutorial". Would insert links, but I can't)