function _get_sync_license_url( $plugin_id = false, $add_action_nonce = true, $params = array() ) {
            if ( is_numeric( $plugin_id ) ) {
                $params['plugin_id'] = $plugin_id;
            }

            return $this->get_account_url(
                $this->get_unique_affix() . '_sync_license',
                $params,
                $add_action_nonce
            );
        }