/** * Include the settings page classes */ public static function get_settings_pages() { if (empty(self::$settings)) { $settings = array(); include_once 'settings/class-mailpoet-paid-memberships-pro-addon-settings-page.php'; $settings[] = (include 'settings/class-mailpoet-paid-memberships-pro-addon-settings.php'); self::$settings = apply_filters('mailpoet_paid_memberships_pro_add_on_get_settings_pages', $settings); } return self::$settings; }