Hi,
To get started with Analytics 2.0 APIs you must first decide whether your application will need an OAuth client or a JWT client.
A JWT client is best if you are creating an application that needs to programmatically authenticate calls to the Adobe Analytics APIs. A new JWT token can be generated whenever the old one is about to expire so your application can continue to make API calls.
Document reference: https://github.com/AdobeDocs/analytics-2.0-apis
Hope this helps!
Thanks,
Saumya