Jetpack_Subscriptions::__construct PHP Method

    function __construct()
    {
        $this->jetpack = Jetpack::init();
        // Don't use COOKIEHASH as it could be shared across installs && is non-unique in multisite.
        // @see: https://twitter.com/nacin/status/378246957451333632
        self::$hash = md5(get_option('siteurl'));
        add_filter('jetpack_xmlrpc_methods', array($this, 'xmlrpc_methods'));
        // @todo remove sync from subscriptions and move elsewhere...
        // Add Configuration Page
        add_action('admin_init', array($this, 'configure'));
        // Set up the subscription widget.
        add_action('widgets_init', array($this, 'widget_init'));
        // Catch subscription widget submits
        if (isset($_REQUEST['jetpack_subscriptions_widget'])) {
            add_action('template_redirect', array($this, 'widget_submit'));
        }
        // Set up the comment subscription checkboxes
        add_action('comment_form', array($this, 'comment_subscribe_init'));
        // Catch comment posts and check for subscriptions.
        add_action('comment_post', array($this, 'comment_subscribe_submit'), 50, 2);
        // Adds post meta checkbox in the post submit metabox
        add_action('post_submitbox_misc_actions', array($this, 'subscription_post_page_metabox'));
        add_action('transition_post_status', array($this, 'maybe_send_subscription_email'), 10, 3);
        add_filter('jetpack_published_post_flags', array($this, 'set_post_flags'), 10, 2);
    }