• key – get API key from Settings > User Plus
• 'group_id' - ID of the group to limit results to. Also accepts multiple values either as an array or as a comma-delimited string.

• 'page' - Page of results to be queried. Default: 1.
• 'per_page' - Number of items to return per page of results. Default: 20.
• 'max' - Max number of items to return.
• 'exclude' - Array of user IDs to exclude.
• 'exclude_admins_mods' - True (or 1) to exclude admins and mods from results. Default: 1.
• 'exclude_banned' - True (or 1) to exclude banned users from results. Default: 1.
• 'group_role' - Array of group roles to include.
• 'search_terms' - Filter results by a search string.
• 'type' - Sort the order of results. 'last_joined', 'first_joined', or any of the $type params available in BP_User_Query. Default: 'last_joined'.

List the members of groups on true, error on False