REST API Integration with JWT Auth

I am looking for an experienced developer to integrate REST API into my application. The main focus of this integration is to integrate applications that can make normal payments through API.

Key requirements:
- Proficiency in using REST API
- Friends with JWT (JSON Web Token) payment integration, please contact me,

Below is an official website example that I need to connect to the API, looking forward to working with you.
https://docs.nihaopay.com/api/