/**
  * Add a transaction history record.
  * @param $saleid
  * @param $userid
  * @param $type
  * @param $desc
  * @return bool|string
  */
 public static function addTransactionHistory($saleid, $userid, $type, $desc)
 {
     $histMdl = new TransHistModel();
     return $histMdl->create($saleid, $userid, $type, $desc);
 }