WC_Cart::get_shipping_packages PHP Method

    public function get_shipping_packages()
    {
        // Packages array for storing 'carts'
        $packages = array();
        $packages[0]['contents'] = $this->get_cart();
        // Items in the package
        $packages[0]['contents_cost'] = 0;
        // Cost of items in the package, set below
        $packages[0]['applied_coupons'] = $this->applied_coupons;
        $packages[0]['user']['ID'] = get_current_user_id();
        $packages[0]['destination']['country'] = WC()->customer->get_shipping_country();
        $packages[0]['destination']['state'] = WC()->customer->get_shipping_state();
        $packages[0]['destination']['postcode'] = WC()->customer->get_shipping_postcode();
        $packages[0]['destination']['city'] = WC()->customer->get_shipping_city();
        $packages[0]['destination']['address'] = WC()->customer->get_shipping_address();
        $packages[0]['destination']['address_2'] = WC()->customer->get_shipping_address_2();
        foreach ($this->get_cart() as $item) {
            if ($item['data']->needs_shipping()) {
                if (isset($item['line_total'])) {
                    $packages[0]['contents_cost'] += $item['line_total'];
                }
            }
        }
        return apply_filters('woocommerce_cart_shipping_packages', $packages);
    }

 /**
  * Stores shipping info on the subscription
  *
  * @param WC_Subscription $subscription instance of a subscriptions object
  * @param WC_Cart $cart A cart with recurring items in it
  */
 public static function add_shipping($subscription, $cart)
 {
     // We need to make sure we only get recurring shipping packages
     WC_Subscriptions_Cart::set_calculation_type('recurring_total');
     foreach ($cart->get_shipping_packages() as $package_index => $base_package) {
         $package = WC_Subscriptions_Cart::get_calculated_shipping_for_package($base_package);
         $recurring_shipping_package_key = WC_Subscriptions_Cart::get_recurring_shipping_package_key($cart->recurring_cart_key, $package_index);
         $shipping_method_id = isset(WC()->checkout()->shipping_methods[$package_index]) ? WC()->checkout()->shipping_methods[$package_index] : '';
         if (isset(WC()->checkout()->shipping_methods[$recurring_shipping_package_key])) {
             $shipping_method_id = WC()->checkout()->shipping_methods[$recurring_shipping_package_key];
             $package_key = $recurring_shipping_package_key;
         } else {
             $package_key = $package_index;
         }
         if (isset($package['rates'][$shipping_method_id])) {
             $item_id = $subscription->add_shipping($package['rates'][$shipping_method_id]);
             if (!$item_id) {
                 throw new Exception(__('Error: Unable to create subscription. Please try again.', 'woocommerce-subscriptions'));
             }
             // Allows plugins to add order item meta to shipping
             do_action('woocommerce_add_shipping_order_item', $subscription->id, $item_id, $package_key);
             do_action('woocommerce_subscriptions_add_recurring_shipping_order_item', $subscription->id, $item_id, $package_key);
         }
     }
     WC_Subscriptions_Cart::set_calculation_type('none');
 }