code: static public function getStates()
      {
          return [
              static::STATE_NEW,
              static::STATE_CANCELED,
              static::STATE_PREPARATION,
              static::STATE_READY,
              static::STATE_SHIPPED,
              static::STATE_PENDING,
              static::STATE_RETURNED,
              static::STATE_NONE,
              static::STATE_PARTIAL,
              static::STATE_COMPLETED,
          ];
      }
docs: Returns all the states.
  
  @return array