Stacks supports several authentication integrations including a variety of ILS systems, OpenAthens. 

These full integrations use User Accounts from these other systems to dynamically generate Stacks users in real time. If this does not apply to your situation, during implementation we can do a one-time bulk import and create of users from a spreadsheet containing name and unique email. 

In this event, all users will be notified by email and prompted to create a password. The users would need to be managed individually after that. We also offer a partial SSO integration that, depending on your system and configuration, may be leveraged to create the Stacks user.