The users resource is an umbrella for operations to manage members within Portal for ArcGIS. The resource returns the total number of members in the system.
As an administrator, you can register enterprise accounts in your portal instance by using the Create User operation. When automatic sign-in for users is disabled in the security configuration, registered enterprise accounts can sign in as members of the portal. This gives you full control on all the accounts within a portal instance.
The response format. The default response format is html.
Values: html | json
JSON Response Syntax
JSON Response Example