Auto Approved Offline Payment

/*
 This snippet will auto approved Offline Payment Gateway
 */
function my_offline_auto_approve_filter( $result, $EM_Booking ){
  //$EM_Event = $EM_Booking->get_event()
  /*
   foreach($EM_Event->get_categories() as $EM_Category){

   }
   */
  if( $EM_Booking->booking_meta['gateway'] == 'offline'  ){
    $EM_Booking->set_status(1,false);
  }
  return $result;
}
add_filter('em_booking_save', 'my_offline_auto_approve_filter', 100, 2);