The access levels are defined in the Gitlab::Access module. Currently, these levels are recognized No access (0) Minimal access (5) (Introduced in GitLab 13.5.) Guest (10) Reporter (20) Developer (30) Maintainer (40).
Expires At
A date string in the format YEAR-MONTH-DAY.
Group ID
The ID or path of the group owned by the authenticated user.
Invite Source
The source of the invitation that starts the member creation process.
User ID
The user ID of the new member or multiple IDs separated by commas.