Authenticate Service Management Rest API through Active Directory

1.Is it possible to authenticate service management REST API with the username and password?

2.Is there any REST API to create active directory?

3.How to get the authorization token to access the service management rest api?

4.Is necessary to create the web application or web api to authenticate the service management rest api?

It would be good to give an idea about how to authenticate the service management rest api using active directory without create web application or web API.