This action runs when a user successfully joins a group.
do_action('profile_magic_join_group_additional_process',$gid,$user_id);
Simple example
function ProfileGrid_join_group_additional_call ($gid,$user_id) { //do something with the user id and Group ID when someone successfully joins a group. } add_action('profile_magic_join_group_additional_process','ProfileGrid_join_group_additional_call');