private function update_email( $new_email ) {
            $this->_logger->entrance();


            $api  = $this->get_api_user_scope();
            $user = $api->call( "?plugin_id={$this->_plugin->id}&fields=id,email,is_verified", 'put', array(
                'email'                   => $new_email,
                'after_email_confirm_url' => $this->_get_admin_page_url(
                    'account',
                    array( 'fs_action' => 'sync_user' )
                ),
            ) );

            if ( ! isset( $user->error ) ) {
                $this->_user->email       = $user->email;
                $this->_user->is_verified = $user->is_verified;
                $this->_store_user();
            } else {
                // handle different error cases.

            }

            return $user;
        }