This API interface CRM system per its api: It's called by any micro-service or web-app as needed.
Actually It provides functions for below systems:
This API is build in ASP.NET CORE: Core is a cross-platform, high-performance, open-source framework for building modern, cloud-enabled, Internet-connected apps.
The API use Serilog: A diagnostic logging library for .NET applications. It is easy to set up, has a clean API, and is portable between recent .NET platforms.