public function create($installedAddOnSid) {
        $data = Values::of(array('InstalledAddOnSid' => $installedAddOnSid, ));

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

        return new AssignedAddOnInstance(
            $this->version,
            $payload,
            $this->solution['accountSid'],
            $this->solution['resourceSid']
        );
    }