Integrating Seleium C#, Specflow with Jira Zephyr Rest API

Hi Team,

We are implementing test automation solution developed with DotNet Core, Selenium 4.3.1 and Specflow. We are Planning to integrate our automation solution with Jira Zephyr. We are using a  Zephyr for test management.

Please help me for below questions:

1. How to generate JWT Authentication with .NET C# Or Is there any API to generate JWT?

2. How to make Zephyr API call from Postman to Create and update testcase status, Create Cycle and Execution. Please help me with postman example.

3. Jira Zephyr Rest API documentation link.

Thanks