src/Easy/EasyForm.php
public function callService($class, $method, $param = null)
    {
        $service = Openbizx::getService($class);
        if ($param) {
            return $service->$method($param);
        } else {
            return $service->$method($this->objectName);
        }
    }
public function callService($class, $method, $param = null)
    {
        $service = Openbizx::getService($class);
        if ($param) {
            return $service->$method($param);
        } else {
            return $service->$method($this->objectName);
        }
    }
Call/Invoke service method, this EasyForm name is passed to the method

@param string $class
@param string $method
@param string $param
@return mixed - return value of the service method