Добавление своего метода доставки в woocommerce

<?php
/*
Plugin Name: Доставка Новой почтой
Plugin URI: http://woothemes.com/woocommerce
Description: Для добавления метода "Доставка Новой почтой"
Version: 1.0.0
Author: WooThemes
Author URI: http://woothemes.com
*/

/**
 * Если активирован вукомерц
 */
if ( in_array( 'woocommerce/woocommerce.php', apply_filters( 'active_plugins', get_option( 'active_plugins' ) ) ) ) {

	function your_shipping_method_init() {
		if ( ! class_exists( 'WC_Your_Shipping_Method' ) ) {
			class WC_Your_Shipping_Method extends WC_Shipping_Method {
				/**
				 * Конструктор класса
				 * @access public
				 * @return void
				 */
				public function __construct() {
					$this->id                 = 'your_shipping_method'; // Идентификатор для метода
					$this->method_title       = __( 'Доставка новой почтой' );  // Название в админке
					$this->method_description = __( 'Метод нужен для вывода "Доставка курьерской службой "Новая почта", оплата за счет покупателя."' ); // Описание в админке

					$this->enabled            = "yes"; // This can be added as an setting but for this example its forced enabled
					$this->title              = 'Доставка курьерской службой "Новая почта", оплата за счет покупателя.'; // This can be added as an setting but for this example its forced.

					$this->init();
				}

				/**
				 * Инициализация настроек
				 * @access public
				 * @return void
				 */
				function init() {
					// Load the settings API
					$this->init_form_fields(); // This is part of the settings API. Override the method to add your own settings
					$this->init_settings(); // This is part of the settings API. Loads settings you previously init.

					// Save settings in admin if you have any defined
					add_action( 'woocommerce_update_options_shipping_' . $this->id, array( $this, 'process_admin_options' ) );
				}

				/**
				 * calculate_shipping function.
				 * @access public
				 * @param mixed $package
				 * @return void
				 */
				public function calculate_shipping( $package ) {
					$rate = array(
						'id' => $this->id,
						'label' => $this->title,
						'cost' => '0.0',
						'calc_tax' => 'per_item'
					);

					// Register the rate
					$this->add_rate( $rate );
				}

				// /**
				//  * Initialise Gateway Settings Form Fields
				//  */
				//  function init_form_fields() {
				// 	 $this->form_fields = array(
				// 	 'title' => array(
				// 		  'title' => __( '', 'woocommerce' ),
				// 		  'type' => 'text',
				// 		  'description' => __( 'This controls the title which the user sees during checkout.', 'woocommerce' ),
				// 		  'default' => __( 'PayPal', 'woocommerce' )
				// 		  ),
				// 	 'description' => array(
				// 		  'title' => __( 'Description', 'woocommerce' ),
				// 		  'type' => 'textarea',
				// 		  'description' => __( 'This controls the description which the user sees during checkout.', 'woocommerce' ),
				// 		  'default' => __("Pay via PayPal; you can pay with your credit card if you don't have a PayPal account", 'woocommerce')
				// 		   )
				// 	 );
				// } // End init_form_fields()

			}
		}
	}

	add_action( 'woocommerce_shipping_init', 'your_shipping_method_init' );

	function add_your_shipping_method( $methods ) {
		$methods[] = 'WC_Your_Shipping_Method';
		return $methods;
	}
	add_filter( 'woocommerce_shipping_methods', 'add_your_shipping_method' );
}

?>