Should this work? Used old script of basic subscribers but edited to prime version, on text prime and in the coding "subscribed with".

Code:
on 1:text:*prime*:#CHANNELNAME:{
  if ( $nick == twitchnotify ) && ($istok($1-,subscribed with,32)) halt
  elseif ($nick == twitchnotify) && ( $4 == $null ) { msg $chan !bonus $1 100 }
}