includes/class-freemius.php
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
            );
        }
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
            );
        }
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 ) ; }
Plugin's account page + sync license URL.

@author Vova Feldman (@svovaf)
@since  1.1.9.1

@param bool|number $plugin_id
@param bool        $add_action_nonce
@param array       $params

@return string
Plugin s account page + sync license URL .