Console/Command/EnableCommand.php
private function setServiceID($serviceId)
    {
        $this->configWriter->save(Config::XML_FASTLY_SERVICE_ID, $serviceId);
        $this->output->writeln(
            '<info>Service ID updated.</info>',
            OutputInterface::OUTPUT_NORMAL
        );
    }
private function setServiceID($serviceId)
    {
        $this->configWriter->save(Config::XML_FASTLY_SERVICE_ID, $serviceId);
        $this->output->writeln(
            '<info>Service ID updated.</info>',
            OutputInterface::OUTPUT_NORMAL
        );
    }
Set Fastly Service ID
@param $serviceId