You wanted it, now you have it!
A complete and (almost) definitive guide to In-App Purchases inside Fusion for Android! An expansion on existing tutorials kindly created by the community, this is the complete guide with text and screenshots from top to bottom. I will be following up with a video on this but at least you have this material to be going off for now.
I hope you all find it of use! Comments, suggestions and feedback always welcome.