eBay REST API OAuth2: Plain English Edition

I’ve been working with the eBay API since my time at a small Chicago startup a few years back. In fact, it was working at this particular startup with a lot of people far smarter than myself that pushed me in the direction of web development, nearly mid career. I had developed some in the past, but mostly small utilities with .NET (C#) or analytical apps/scriptlets with Python. The eBay API is challenging, which…