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You can invite users from the user overview page. As soon as you invite a user to CORE, a green bar will appear in front of a users name. This means that they have not yet successfully authenticated. When they successfully login for the first time the credentials you filled in will be overwritten by their respective federated attribute values.
For example, if you invite a user gijtenbeek@terena.org and the user logs in with their google account, the email address field will become: ik@christiangijtenbeek.nl - In the useraudit db table there will however be a record of what credentials you used to invite the user. You can always look at these values by clicking on the respective user row.
The time before an invite expires can be configured in application/configs/application.ini directive core.userInviteTtl = '3 months'. The value must be of type 'Interval' as defined by PostgreSQL
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