Here are examples of topics I covered. They may have been updated since I worked on them, however, in many cases, I was the original author and the information architect, determining where to place the doc in the existing doc architecture. I met with Subject Matter Experts, product leads, the UX team, and others. I recorded demos when possible, then created drafts for their review. I also submitted docs for peer review so that we could ensure that our style guide was being followed, then published doc using either MadCap Flare or Git.
In-App Purchasing
Here is a link to additional doc :
https://docs.unity3d.com/Manual/com.unity.purchasing.html. While the doc has been updated since I wrote, it gives you a flavor of what I worked on.