Rejects requests to join a group.
Note: This function is only relevant for private groups.
The rejectJoinRequests() function returns a Promise that resolves when the site member's request to join a group is rejected.
Only site admins or group admins can reject site member requests to join the group, unless the group setting, membersCanApprove is set to true.
Note: If the suppressAuth option is set to true, all permissions are overwritten, and all site members (including non-group members) can reject site member requests to join a group.
ID of the group requested to join.
Rejection data.
Authorization options.