code: private function getCallable(array $options)
      {
          $serviceId = $options['service'];
          $method = $options['method'];
          $service = $this->container->get($serviceId);
          $callable = [$service, $method];
  
          if (!is_callable($callable)) {
              throw new \InvalidArgumentException(sprintf(
                  'The param converter is configured to use a non existent method "%s::%s()" on the "%s" service.',
                  get_class($service), $method, $serviceId
              ));
          }
  
          return $callable;
      }
docs: @param array $options
  
  @return array