public function init() {
        add_filter('usces_filter_cart_upbutton', [$this, 'cartBatchDropdown'], 10, 1);
        add_filter('usces_theme_filter_upbutton', [$this, 'cartBatchDropdown'], 10, 1);
        add_filter('usces_filter_cart_row', [$this, 'filterCartRow'], 11, 3);
        add_action('usces_action_cart_page_header', [$this, 'startMobileBuffer'], 1);
        add_action('usces_action_cart_page_inform', [$this, 'endMobileBuffer'], 1);

        // for deprecated direct edit of theme file wc_cart_page.php
        add_filter('asumil_filter_cart_batch_dropdown', [$this, 'cartBatchDropdown'], 10, 1);
    }