We are a small IT company that works mainly with ASP.NET and .NET Core; we are planning for a standard solution with the most important features of e-commerce, but with a fully customizable possibility. Even if there is no customizability, there should exist stable plugins for every added feature even if paid, like adding comments possibility for students...

The most important other thing is that we have solution based mainly on .NET in the backend and AngularJS or React in front, our choice should be based on the possibility of integration of the chosen e-commerce platform with our other software.

To resume, we need fully customizable features or existed stable plugins for a lot of features. We also want no problems in integrating two systems like the Appointment system and the e-commerce platform. Please help me. I'm new to this company, and I had them perform a study for different CMS solutions that exist and pre-built.