Endpoint:

{+serverURL}/api/3.12/auth/signin

Description:

Authentication endpoint of the Tableau REST API.

Documentation:

https://help.tableau.com/current/api/rest_api/en-us/REST/rest_api_ref_authentication.htm

Endpoint:

{+serverURL}/api/3.12/sites/{siteID}/users

Description:

User endpoint of the Tableau REST API.

Documentation:

https://help.tableau.com/current/api/rest_api/en-us/REST/rest_api_ref_users_and_groups.htm#get_users_on_site