класс action/service
    public function getAction() {
        $code = $this->getParam("code");

        $service = __NAMESPACE__ . '\\Services\\' . $code;

        $params = $this->getPostList($service::PARAMS['get']);
        $result = $type::getList($params);

        return $result;
    }
класс например transport:

   public const PARAMS = ['get'=>'id','list'=>''];

...

   public function getList($params) {

... логика метода