public function create($path, $visibility) {
        $data = Values::of(array('Path' => $path, 'Visibility' => $visibility, ));

        $payload = $this->version->create(
            'POST',
            $this->uri,
            array(),
            $data
        );

        return new FunctionVersionInstance(
            $this->version,
            $payload,
            $this->solution['serviceSid'],
            $this->solution['functionSid']
        );
    }