While working on Sitecore commerce project, at many point of time we would like to debug the commerce part of the application similar to as we used to debug the Sitecore solution. To be able to debug the Sitecore commerce engine, there are couple of key concepts to understand. Which will help you understand the connection and debug commerce engine effectively.
If you are not much familiar with Commerce Engine, please see Getting started with Sitecore Commerce
I have used Sitecore Commerce 9.2 version to perform all these debugging steps.
To debug commerce engine, you fist need to know how authentication works for different systems like Business Tools, Storefront, Content Editor, Postman etc.