The Admin with a UserManagement role should log into the OutSystems Users App and create a User Group. Then create one or more OutSystems User Accounts and add them to the newly created User Group. Next, log in to the Builder, go to the Project → Security tab, select Basic Auth → Select the newly created user group.
Result: Only the OutSystems User Accounts that are part of the User Group can invoke the Test or Production service links.
Please refer to this link for more information about managing End User Accounts with OutSystems.