Request/ParamConverter/ServiceParamConverter.php
private function callService(Request $request, ParamConverter $configuration)
    {
        $options = $configuration->getOptions();
        $callable = $this->getCallable($options);

        return call_user_func_array($callable, $this->extractArguments($request, $options));
    }
private function callService(Request $request, ParamConverter $configuration)
    {
        $options = $configuration->getOptions();
        $callable = $this->getCallable($options);

        return call_user_func_array($callable, $this->extractArguments($request, $options));
    }
@param Request        $request
@param ParamConverter $configuration

@return mixed