code: public function setRedirectType($type)
      {
          if (!in_array($type, array(self::GOBACK, self::REFRESH))) {
              throw new Exception(
                  "Redirect type must use either the GOBACK or REFRESH constants on BetterButtonCustomAction"
              );
          }
  
          $this->redirectType = $type;
  
          return $this;
      }
docs: Sets the behaviour on completion of the action, either refresh or go back to list.
  See self::GOBACK and self::REFRESH constants
  
  @param int $type
  @throws Exception if the redirect type is not supported