Function: Get reputation event activity.
Function: Count reputation points of a user.
Function: Get user reputation from user meta.
Function: Insert new subscriber.
Function: Get a subscriber.
Function: Get a subscribers count of a reference by specific event or without it.
Function: Get subscribers. Total subscribers count will be returned if no argument is passed.
Function: Delete subscribers by event, ref_id and user_id.
Function: Check if user is subscribed to a reference event.
Function: Return category for sorting dropdown.