API Documentation

[Ryan K]

Jira Server v7.3 

I am trying to access GET API to generate some internal reports on group and user permissions, login information. 

I am using admin account to fetch "/admin/users" and "/admin/groups". I am not able to use any other API from this document https://docs.atlassian.com/bitbucket-server/rest/5.16.0/bitbucket-rest.html

I keep on getting 404 errors. I am using PowerShell "Invoke-RestMethod". 

I am not finding any documentation providing proper information. Any assistance on resolving all other API GET resource 404 would be appreciated. Is there Swagger configured to this product