Плагин Wordpress - Обновление с API сервера

Question

Я нахожусь в процессе написания функции обновления для моего плагина, которая обслуживается через мой сервер, и обновления плагина будут вызываться через API. До сих пор я могу получить уведомление об обновлении для отображения на экране плагина. Однако, когда я нажимаю на ссылку «Просмотр версии», она выдает кучу ошибок. Показано ниже.

Я удалил большую часть кода, чтобы получить базовый набор кодов для работы до интеграции API. (так как я не знаю, какие данные требуются). Таким образом, запросы API на данный момент являются просто статическими данными в классе.

Страница: wp-admin/plugin-install.php?tab=plugin-information&plugin=myplugin&section=changelog

Warning: call_user_func_array() expects parameter 1 to be a valid callback, array must have exactly two members in /home/example/public_html/wp-includes/class-wp-hook.php on line 288
Warning: Creating default object from empty value in /home/example/public_html/wp-admin/includes/plugin-install.php on line 223
Notice: Undefined property: stdClass::$sections in /home/example/public_html/wp-admin/includes/plugin-install.php on line 566
Notice: Undefined property: stdClass::$sections in /home/example/public_html/wp-admin/includes/plugin-install.php on line 580
Notice: Undefined property: stdClass::$name in /home/example/public_html/wp-admin/includes/plugin-install.php on line 607

Вот мои действия

add_filter( 'plugins_api', array( $cc_maintenance, 'plugin_info', 20, 3 ) );
add_filter( 'site_transient_update_plugins', array( $cc_maintenance, 'push_update' ) );
add_action( 'upgrader_process_complete', array( $cc_maintenance, 'after_update' ), 10, 2 );

Вот моифайл класса $ cc_maintenance

<?php

class example_Maintenance
{

    public function __construct()
    {
    }

    public function plugin_info( $res, $action, $args )
    {
        // do nothing if this is not about getting plugin information
        if( $action !== 'plugin_information' ):
            return false;
        endif;

        // do nothing if it is not our plugin
        if( 'example' !== $args->slug ):
            return $res;
        endif;

        // trying to get from cache first, to disable cache comment 18,28,29,30,32
        if( false == $remote = get_transient( 'upgrade_example_plugin' ) ):


            $remote = json_encode( array(
                "name" => "Test Updater",
                "slug" => "example",
                "download_url" => "https://example.com/wp-content/uploads/test-updater.zip",
                "version" => "1.0.0",
                "requires" => "3.0",
                "tested" => "4.8.1",
                "last_updated" => "2017-08-17 02:10:00",
                "upgrade_notice" => "Plugin update is available.",
                "author" => "Example Name",
                "author_homepage" => "https://example.com",
                "sections" => array(
                    "description" => "This is the plugin to test your updater script",
                    "installation" => "Upload the plugin to your blog, Activate it, that\'s it!",
                    "changelog" => "<h4>1.1 –  August 17, 2017</h4><ul><li>Some bugs are fixed.</li><li>Release date.</li></ul>"
                    ))
            );


            if ( !is_wp_error( $remote ) && isset( $remote['response']['code'] ) && $remote['response']['code'] == 200 && !empty( $remote['body'] ) ):
                set_transient( 'upgrade_example_plugin', $remote, 43200 ); // 12 hours cache
            endif;

        endif;

        if( $remote ):

            $remote = json_decode( $remote );
            $res = new stdClass();
            $res->name = $remote->name;
            $res->slug = 'example';
            $res->version = $remote->version;
            $res->tested = $remote->tested;
            $res->requires = $remote->requires;
            $res->author = '<a href="https://example.com">Example Author</a>'; 
            $res->author_profile = ''; 
            $res->download_link = $remote->download_url;
            $res->trunk = $remote->download_url;
            $res->last_updated = $remote->last_updated;
            $res->sections = array(
                'description' => "tab description",
                'installation' => "tab installation",
                'changelog' => "tab changelog",
            );

            // in case you want the screenshots tab, use the following HTML format for its content:
            // <ol><li><a href="IMG_URL" target="_blank" rel="noopener noreferrer"><img src="IMG_URL" alt="CAPTION" /></a><p>CAPTION</p></li></ol>
            if( !empty( $remote->sections->screenshots ) ) {
                $res->sections['screenshots'] = $remote->sections->screenshots;
            }

            $res->banners = array(
                'low' => 'https://example.com/banner-772x250.jpg',
                'high' => 'https://example.com/banner-1544x500.jpg'
            );
            return $res;

        endif;

        return false;
    }

    public function push_update( $transient ){

        delete_transient( 'upgrade_example_plugin' );
        if ( empty($transient->checked ) ):
            return $transient;
        endif;

            // your installed plugin version should be on the line below! You can obtain it dynamically of course
                $res = new stdClass();
                $res->slug = 'example';
                $res->plugin = 'example/example.php'; 
                $res->new_version = "1.0.1";
                $res->tested = "5.0.0";
                $res->package = "http://example.com/upgrade.zip";
                $res->sections = serialize( array(
                    "Tab1" => "some content",
                    "Tab2" => "some content",
                    "Tab3" => "some content",
                ));
                $transient->response['example/example.php'] = $res;

        return $transient;
    }

    public function after_update( $upgrader_object, $options ) {
        if ( $options['action'] == 'update' && $options['type'] === 'plugin' )  {
            // just clean the cache when new plugin version is installed
            delete_transient( 'upgrade_example_plugin' );
        }
    }
}

Любая помощь приветствуется. Заранее спасибо