View file File name : class-plugin.php Content :<?php namespace QuadLayers\QLWAPP; use QuadLayers\QLWAPP\Api\Admin_Menu_Routes_Library; final class Plugin { protected static $instance; private function __construct() { load_plugin_textdomain( 'wp-whatsapp-chat', false, QLWAPP_PLUGIN_DIR . '/languages/' ); Admin_Menu_Routes_Library::instance(); Controllers\Helpers::instance(); Controllers\Components::instance(); Controllers\Admin_Menu::instance(); Controllers\Admin_Menu_WooCommerce::instance(); Frontend::instance(); WooCommerce::instance(); add_action( 'admin_footer', array( __CLASS__, 'add_premium_css' ) ); do_action( 'qlwapp_init' ); } public static function add_premium_css() { ?> <style> .qlwapp-premium-field { opacity: 0.5; pointer-events: none; } .qlwapp-premium-field .description { display: block!important; } </style> <?php } public static function instance() { if ( is_null( self::$instance ) ) { self::$instance = new self(); } return self::$instance; } } Plugin::instance();