/**
  * When a new order is inserted, add the subscriptions period to the order. 
  * 
  * It's important that the period is tied to the order so that changing the products
  * period does not change the past. 
  *
  * @since 1.0
  */
 public static function add_order_meta($order_id)
 {
     global $woocommerce;
     if (WC_Subscriptions_Order::order_contains_subscription($order_id)) {
         $order = new WC_Order($order_id);
         $order_subscription_periods = array();
         $order_subscription_intervals = array();
         $order_subscription_lengths = array();
         $order_subscription_trial_lengths = array();
         foreach ($order->get_items() as $item) {
             $period = WC_Subscriptions_Product::get_period($item['id']);
             if (!empty($period)) {
                 $order_subscription_periods[$item['id']] = $period;
             }
             $interval = WC_Subscriptions_Product::get_interval($item['id']);
             if (!empty($interval)) {
                 $order_subscription_intervals[$item['id']] = $interval;
             }
             $length = WC_Subscriptions_Product::get_length($item['id']);
             if (!empty($length)) {
                 $order_subscription_lengths[$item['id']] = $length;
             }
             $trial_length = WC_Subscriptions_Product::get_trial_length($item['id']);
             if (!empty($trial_length)) {
                 $order_subscription_trial_lengths[$item['id']] = $trial_length;
             }
         }
         update_post_meta($order_id, '_order_subscription_periods', $order_subscription_periods);
         update_post_meta($order_id, '_order_subscription_intervals', $order_subscription_intervals);
         update_post_meta($order_id, '_order_subscription_lengths', $order_subscription_lengths);
         update_post_meta($order_id, '_order_subscription_trial_lengths', $order_subscription_trial_lengths);
         // Store sign-up fee details
         foreach (WC_Subscriptions_Cart::get_sign_up_fee_fields() as $field_name) {
             update_post_meta($order_id, "_{$field_name}", $woocommerce->cart->{$field_name});
         }
         // Prepare sign up fee taxes to store in same format as order taxes
         $sign_up_fee_taxes = array();
         foreach (array_keys($woocommerce->cart->sign_up_fee_taxes) as $key) {
             $is_compound = $woocommerce->cart->tax->is_compound($key) ? 1 : 0;
             $sign_up_fee_taxes[] = array('label' => $woocommerce->cart->tax->get_rate_label($key), 'compound' => $is_compound, 'cart_tax' => number_format($woocommerce->cart->sign_up_fee_taxes[$key], 2, '.', ''));
         }
         update_post_meta($order_id, '_sign_up_fee_taxes', $sign_up_fee_taxes);
     }
 }

 /**
  * Removes a couple of notifications that are less relevant for Subscription orders.
  * 
  * @since 1.0
  */
 public static function maybe_remove_customer_processing_order($order_id)
 {
     if (WC_Subscriptions_Order::order_contains_subscription($order_id)) {
         remove_action('woocommerce_order_status_pending_to_processing_notification', array(self::$woocommerce_email, 'customer_processing_order'));
         remove_action('woocommerce_order_status_pending_to_on-hold_notification', array(self::$woocommerce_email, 'customer_processing_order'));
     }
 }

 /**
  * When a new order is inserted, add the subscriptions period to the order. 
  * 
  * It's important that the period is tied to the order so that changing the products
  * period does not change the past. 
  *
  * @since 1.0
  */
 public static function add_order_meta($order_id, $posted)
 {
     global $woocommerce;
     if (WC_Subscriptions_Order::order_contains_subscription($order_id)) {
         // This works because the 'new_order_item' runs before the 'woocommerce_checkout_update_order_meta' hook
         // Set the recurring totals so totals display correctly on order page
         update_post_meta($order_id, '_order_recurring_discount_cart', WC_Subscriptions_Cart::get_recurring_discount_cart());
         update_post_meta($order_id, '_order_recurring_discount_total', WC_Subscriptions_Cart::get_recurring_discount_total());
         update_post_meta($order_id, '_order_recurring_shipping_tax_total', WC_Subscriptions_Cart::get_recurring_shipping_tax_total());
         update_post_meta($order_id, '_order_recurring_tax_total', WC_Subscriptions_Cart::get_recurring_total_tax());
         update_post_meta($order_id, '_order_recurring_total', WC_Subscriptions_Cart::get_recurring_total());
         // Get recurring taxes into same format as _order_taxes
         $order_recurring_taxes = array();
         foreach (WC_Subscriptions_Cart::get_recurring_taxes() as $tax_key => $tax_amount) {
             $is_compound = $woocommerce->cart->tax->is_compound($tax_key) ? 1 : 0;
             if (isset($woocommerce->cart->taxes[$tax_key])) {
                 $cart_tax = $tax_amount;
                 $shipping_tax = 0;
             } else {
                 $cart_tax = 0;
                 $shipping_tax = $tax_amount;
             }
             $order_recurring_taxes[] = array('label' => $woocommerce->cart->tax->get_rate_label($tax_key), 'compound' => $is_compound, 'cart_tax' => woocommerce_format_total($cart_tax), 'shipping_tax' => woocommerce_format_total($shipping_tax));
         }
         update_post_meta($order_id, '_order_recurring_taxes', $order_recurring_taxes);
         $payment_gateways = $woocommerce->payment_gateways->payment_gateways();
         if (!$payment_gateways[$posted['payment_method']]->supports('subscriptions')) {
             update_post_meta($order_id, '_wcs_requires_manual_renewal', 'true');
         }
     }
 }

 /**
  * Process the payment
  */
 function process_payment($order_id)
 {
     global $woocommerce;
     if (class_exists('WC_Subscriptions_Order') && WC_Subscriptions_Order::order_contains_subscription($order_id)) {
         $order = new WC_Order($order_id);
         $stripe_token = isset($_POST['stripe_token']) ? woocommerce_clean($_POST['stripe_token']) : '';
         // Use Stripe CURL API for payment
         try {
             $post_data = array();
             $customer_id = 0;
             // Check if paying via customer ID
             if (isset($_POST['stripe_customer_id']) && $_POST['stripe_customer_id'] !== 'new' && is_user_logged_in()) {
                 $customer_ids = get_user_meta(get_current_user_id(), '_stripe_customer_id', false);
                 if (isset($customer_ids[$_POST['stripe_customer_id']]['customer_id'])) {
                     $customer_id = $customer_ids[$_POST['stripe_customer_id']]['customer_id'];
                 } else {
                     throw new Exception(__('Invalid card.', 'wc_stripe'));
                 }
             } elseif (empty($stripe_token)) {
                 throw new Exception(__('Please make sure your card details have been entered correctly and that your browser supports JavaScript.', 'wc_stripe'));
             }
             if (method_exists('WC_Subscriptions_Order', 'get_total_initial_payment')) {
                 $initial_payment = WC_Subscriptions_Order::get_total_initial_payment($order);
             } else {
                 $initial_payment = WC_Subscriptions_Order::get_sign_up_fee($order) + WC_Subscriptions_Order::get_price_per_period($order);
             }
             $customer_response = $this->add_customer_to_order($order, $customer_id, $stripe_token);
             if ($initial_payment > 0) {
                 $payment_response = $this->process_subscription_payment($order, $initial_payment);
             }
             if (is_wp_error($customer_response)) {
                 throw new Exception($customer_response->get_error_message());
             } else {
                 if (isset($payment_response) && is_wp_error($payment_response)) {
                     throw new Exception($payment_response->get_error_message());
                 } else {
                     // Payment complete
                     $order->payment_complete();
                     // Remove cart
                     $woocommerce->cart->empty_cart();
                     // Activate subscriptions
                     WC_Subscriptions_Manager::activate_subscriptions_for_order($order);
                     // Store token
                     if ($stripe_token) {
                         update_post_meta($order->id, '_stripe_token', $stripe_token);
                     }
                     // Return thank you page redirect
                     return array('result' => 'success', 'redirect' => $this->get_return_url($order));
                 }
             }
         } catch (Exception $e) {
             $woocommerce->add_error(__('Error:', 'wc_stripe') . ' "' . $e->getMessage() . '"');
             return;
         }
     } else {
         return parent::process_payment($order_id);
     }
 }

/**
 * Get the string key for a subscription used in Subscriptions prior to 2.0.
 *
 * Previously, a subscription key was made up of the ID of the order used to purchase the subscription, and
 * the product to which the subscription relates; however, in Subscriptions 2.0, subscriptions can actually
 * relate to multiple products (because they can contain multiple line items) and they also no longer need
 * to have an original order associated with them, to make manually adding subscriptions more accurate.
 *
 * Therefore, although the return value of this method is a string matching the key form used  inSubscriptions
 * prior to 2.0, the actual value represented is not a perfect analogue. Specifically,
 *  - if the subscription contains more than one product, only the ID of the first line item will be used in the ID
 *  - if the subscription does not contain any products, the key still be missing that component of the
 *  - if the subscription does not have an initial order, then the order ID used will be the WC_Subscription object's ID
 *
 * @param WC_Subscription $subscription An instance of WC_Subscription
 * @return string $subscription_key A subscription key in the deprecated form previously created by @see self::get_subscription_key()
 * @since 2.0
 */
function wcs_get_old_subscription_key(WC_Subscription $subscription)
{
    // Get an ID to use as the order ID
    $order_id = isset($subscription->order->id) ? $subscription->order->id : $subscription->id;
    // Get an ID to use as the product ID
    $subscription_items = $subscription->get_items();
    $first_item = reset($subscription_items);
    return $order_id . '_' . WC_Subscriptions_Order::get_items_product_id($first_item);
}

 /**
  * Process the payment
  *
  * @param  int $order_id
  * @return array
  */
 public function process_payment($order_id, $retry = true)
 {
     // Processing subscription
     if (class_exists('WC_Subscriptions_Order') && WC_Subscriptions_Order::order_contains_subscription($order_id)) {
         return $this->process_subscription($order_id, $retry);
         // Processing pre-order or standard ordre
     } else {
         return parent::process_payment($order_id, $retry);
     }
 }

 /**
  * For versions of WooCommerce prior to the existence of the woocommerce_available_gateways, 
  * hide available gateways with JavaScript.
  * 
  * @since 1.0
  */
 public static function gateway_scheduled_subscription_payment($user_id, $subscription_key)
 {
     $subscription = WC_Subscriptions_Manager::get_users_subscription($user_id, $subscription_key);
     $order = new WC_Order($subscription['order_id']);
     $amount_to_charge = WC_Subscriptions_Order::get_price_per_period($order, $subscription['product_id']);
     $outstanding_payments = WC_Subscriptions_Order::get_outstanding_balance($order, $subscription['product_id']);
     if ($outstanding_payments > 0) {
         $amount_to_charge += $outstanding_payments;
     }
     do_action('scheduled_subscription_payment_' . $order->payment_method, $amount_to_charge, $order, $subscription['product_id']);
 }

 /**
  * Change the status of a subscription and show a notice to the
  * user to say when the next payment will now be made on.
  *
  * @since  1.0.0
  * @access public
  * @static
  * @param  $subscription
  * @param  $order_id
  * @param  $product_id
  * @uses   WC_Subscriptions::add_notice
  */
 public static function change_users_subscription($subscription, $order_id, $product_id)
 {
     $subscription = !is_object($subscription) ? wcs_get_subscription($subscription) : $subscription;
     $current_next_subscription_payment = WC_Subscriptions_Order::get_next_payment_date($order_id, $product_id, $from_date = '');
     // Get the date of the current next subscription.
     $next_subscription_payment = WC_Subscriptions_Order::calculate_next_payment_date($order_id, $product_id, $type = 'mysql', $current_next_subscription_payment);
     WCSO_Subscriptions_Order::update_next_payment($order_id, $next_subscription_payment);
     // Update the next payment on the subscriptions order.
     $subscription->add_order_note(__('Subscription was skipped by the subscriber from their subscription page.', 'woocommerce-skip-one'));
     // translators: placeholder is next subscription payment
     WC_Subscriptions::add_notice(sprintf(__('You next payment subscription will now be on the %s.', 'woocommerce-skip-one'), $next_subscription_payment), 'success');
 }

 public function init()
 {
     global $wpdb;
     $subscriptions_meta_key = $wpdb->get_blog_prefix() . 'woocommerce_subscriptions';
     $order_items_table = $wpdb->get_blog_prefix() . 'woocommerce_order_items';
     $order_item_meta_table = $wpdb->get_blog_prefix() . 'woocommerce_order_itemmeta';
     // Get the IDs of all users who have a subscription
     $users_to_upgrade = get_users(array('meta_key' => $subscriptions_meta_key, 'fields' => 'ID', 'orderby' => 'ID'));
     $users_to_upgrade = array_filter($users_to_upgrade, __CLASS__ . '::is_user_upgraded');
     foreach ($users_to_upgrade as $user_to_upgrade) {
         // Can't use WC_Subscriptions_Manager::get_users_subscriptions() because it relies on the new structure
         $users_old_subscriptions = get_user_option($subscriptions_meta_key, $user_to_upgrade);
         foreach ($users_old_subscriptions as $subscription_key => $subscription) {
             if (!isset($subscription['order_id'])) {
                 // Subscription created incorrectly with v1.1.2
                 continue;
             }
             $order_item_id = WC_Subscriptions_Order::get_item_id_by_subscription_key($subscription_key);
             if (empty($order_item_id)) {
                 // Subscription created incorrectly with v1.1.2
                 continue;
             }
             if (!isset($subscription['trial_expiry_date'])) {
                 $subscription['trial_expiry_date'] = '';
             }
             // Set defaults
             $failed_payments = isset($subscription['failed_payments']) ? $subscription['failed_payments'] : 0;
             $completed_payments = isset($subscription['completed_payments']) ? $subscription['completed_payments'] : array();
             $suspension_count = isset($subscription['suspension_count']) ? $subscription['suspension_count'] : 0;
             $trial_expiry_date = isset($subscription['trial_expiry_date']) ? $subscription['trial_expiry_date'] : '';
             $wpdb->query($wpdb->prepare("INSERT INTO {$order_item_meta_table} (order_item_id, meta_key, meta_value)\n\t\t\t\t\t\tVALUES\n\t\t\t\t\t\t(%d,%s,%s),\n\t\t\t\t\t\t(%d,%s,%s),\n\t\t\t\t\t\t(%d,%s,%s),\n\t\t\t\t\t\t(%d,%s,%s),\n\t\t\t\t\t\t(%d,%s,%s),\n\t\t\t\t\t\t(%d,%s,%s),\n\t\t\t\t\t\t(%d,%s,%s),\n\t\t\t\t\t\t(%d,%s,%s)", $order_item_id, '_subscription_status', $subscription['status'], $order_item_id, '_subscription_start_date', $subscription['start_date'], $order_item_id, '_subscription_expiry_date', $subscription['expiry_date'], $order_item_id, '_subscription_end_date', $subscription['end_date'], $order_item_id, '_subscription_trial_expiry_date', $trial_expiry_date, $order_item_id, '_subscription_failed_payments', $failed_payments, $order_item_id, '_subscription_completed_payments', serialize($completed_payments), $order_item_id, '_subscription_suspension_count', $suspension_count));
         }
         update_option('wcs_1_4_last_upgraded_user_id', $user_to_upgrade);
         self::$last_upgraded_user_id = $user_to_upgrade;
     }
     // Add an underscore prefix to usermeta key to deprecate, but not delete, subscriptions in user meta
     $wpdb->update($wpdb->usermeta, array('meta_key' => '_' . $subscriptions_meta_key), array('meta_key' => $subscriptions_meta_key));
     // Now set the recurring shipping & payment method on all subscription orders
     $wpdb->query("INSERT INTO {$wpdb->postmeta} (`post_id`, `meta_key`, `meta_value`)\n\t\t\tSELECT `post_id`, CONCAT('_recurring',`meta_key`), `meta_value`\n\t\t\tFROM {$wpdb->postmeta}\n\t\t\tWHERE `meta_key` IN ('_shipping_method','_shipping_method_title','_payment_method','_payment_method_title')\n\t\t\tAND `post_id` IN (\n\t\t\t\tSELECT `post_id` FROM {$wpdb->postmeta} WHERE `meta_key` = '_order_recurring_total'\n\t\t\t)");
     // Set the recurring shipping total on all subscription orders
     $wpdb->query("INSERT INTO {$wpdb->postmeta} (`post_id`, `meta_key`, `meta_value`)\n\t\t\tSELECT `post_id`, '_order_recurring_shipping_total', `meta_value`\n\t\t\tFROM {$wpdb->postmeta}\n\t\t\tWHERE `meta_key` = '_order_shipping'\n\t\t\tAND `post_id` IN (\n\t\t\t\tSELECT `post_id` FROM {$wpdb->postmeta} WHERE `meta_key` = '_order_recurring_total'\n\t\t\t)");
     // Get the ID of all orders for a subscription with a free trial and no sign-up fee
     $order_ids = $wpdb->get_col("SELECT order_items.order_id FROM {$order_items_table} AS order_items\n\t\t\t\tLEFT JOIN {$order_item_meta_table} AS itemmeta USING (order_item_id)\n\t\t\t\tLEFT JOIN {$order_item_meta_table} AS itemmeta2 USING (order_item_id)\n\t\t\tWHERE itemmeta.meta_key = '_subscription_trial_length'\n\t\t\tAND itemmeta.meta_value > 0\n\t\t\tAND itemmeta2.meta_key = '_subscription_sign_up_fee'\n\t\t\tAND itemmeta2.meta_value > 0");
     $order_ids = implode(',', array_map('absint', array_unique($order_ids)));
     // Now set the order totals to $0 (can't use $wpdb->update as it only allows joining WHERE clauses with AND)
     if (!empty($order_ids)) {
         $wpdb->query("UPDATE {$wpdb->postmeta}\n\t\t\t\tSET `meta_value` = 0\n\t\t\t\tWHERE `meta_key` IN ( '_order_total', '_order_tax', '_order_shipping_tax', '_order_shipping', '_order_discount', '_cart_discount' )\n\t\t\t\tAND `post_id` IN ( {$order_ids} )");
         // Now set the line totals to $0
         $wpdb->query("UPDATE {$order_item_meta_table}\n\t\t\t\t SET `meta_value` = 0\n\t\t\t\t WHERE `meta_key` IN ( '_line_subtotal', '_line_subtotal_tax', '_line_total', '_line_tax', 'tax_amount', 'shipping_tax_amount' )\n\t\t\t\t AND `order_item_id` IN (\n\t\t\t\t\tSELECT `order_item_id` FROM {$order_items_table}\n\t\t\t\t\tWHERE `order_item_type` IN ('tax','line_item')\n\t\t\t\t\tAND `order_id` IN ( {$order_ids} )\n\t\t\t\t)");
     }
     update_option('wcs_1_4_upgraded_order_ids', explode(',', $order_ids));
 }

 /**
  * Process the subscription.
  *
  * @param WC_Order $order
  *
  * @return array
  */
 protected function process_subscription($order_id)
 {
     try {
         $order = new WC_Order($order_id);
         if (!isset($_POST['iugu_token'])) {
             if ('yes' == $this->debug) {
                 $this->log->add($this->id, 'Error doing the subscription for order ' . $order->get_order_number() . ': Missing the "iugu_token".');
             }
             $error_msg = __('Please make sure your card details have been entered correctly and that your browser supports JavaScript.', 'iugu-woocommerce');
             throw new Exception($error_msg);
         }
         // Create customer payment method.
         $payment_method_id = $this->api->create_customer_payment_method($order, $_POST['iugu_token']);
         if (!$payment_method_id) {
             if ('yes' == $this->debug) {
                 $this->log->add($this->id, 'Invalid customer method ID for order ' . $order->get_order_number());
             }
             $error_msg = __('An error occurred while trying to save your data. Please contact us for get help.', 'iugu-woocommerce');
             throw new Exception($error_msg);
         }
         // Save the payment method ID in order data.
         update_post_meta($order->id, '_iugu_customer_payment_method_id', $payment_method_id);
         // Try to do an initial payment.
         $initial_payment = WC_Subscriptions_Order::get_total_initial_payment($order);
         if ($initial_payment > 0) {
             $payment_response = $this->process_subscription_payment($order, $initial_payment);
         }
         if (isset($payment_response) && is_wp_error($payment_response)) {
             throw new Exception($payment_response->get_error_message());
         } else {
             // Remove cart
             $this->api->empty_card();
             // Return thank you page redirect
             return array('result' => 'success', 'redirect' => $this->get_return_url($order));
         }
     } catch (Exception $e) {
         $this->api->add_error('<strong>' . esc_attr($this->title) . '</strong>: ' . $e->getMessage());
         return array('result' => 'fail', 'redirect' => '');
     }
 }

 /**
  * Process the subscription.
  *
  * @param WC_Order $order
  *
  * @return array
  */
 protected function process_subscription($order_id)
 {
     try {
         $order = new WC_Order($order_id);
         // Try to do an initial payment.
         $initial_payment = WC_Subscriptions_Order::get_total_initial_payment($order);
         if ($initial_payment > 0) {
             $payment_response = $this->process_subscription_payment($order, $initial_payment);
         }
         if (isset($payment_response) && is_wp_error($payment_response)) {
             throw new Exception($payment_response->get_error_message());
         } else {
             // Remove cart
             $this->api->empty_card();
             // Return thank you page redirect
             return array('result' => 'success', 'redirect' => $this->get_return_url($order));
         }
     } catch (Exception $e) {
         $this->api->add_error('<strong>' . esc_attr($this->title) . '</strong>: ' . $e->getMessage());
         return array('result' => 'fail', 'redirect' => '');
     }
 }

 public function request_access_code($order, $method = 'ProcessPayment', $trx_type = 'Purchase')
 {
     $customer_ip = get_post_meta($order->id, '_customer_ip_address', true);
     // Check if order is for a subscription, if it is check for fee and charge that
     if (class_exists('WC_Subscriptions_Order') && WC_Subscriptions_Order::order_contains_subscription($order->id)) {
         if (0 == WC_Subscriptions_Order::get_total_initial_payment($order)) {
             $method = 'CreateTokenCustomer';
         } else {
             $method = 'TokenPayment';
         }
         $trx_type = 'Recurring';
         $order_total = WC_Subscriptions_Order::get_total_initial_payment($order) * 100;
     } else {
         $order_total = $order->get_total() * 100.0;
     }
     // set up request object
     $request = array('Method' => $method, 'TransactionType' => $trx_type, 'RedirectUrl' => str_replace('https:', 'http:', add_query_arg(array('wc-api' => 'WC_Gateway_EWAY', 'order_id' => $order->id, 'order_key' => $order->order_key, 'sig_key' => md5($order->order_key . 'WOO' . $order->id)), home_url('/'))), 'IPAddress' => $customer_ip, 'DeviceID' => '0b38ae7c3c5b466f8b234a8955f62bdd', 'PartnerID' => '0b38ae7c3c5b466f8b234a8955f62bdd', 'Payment' => array('TotalAmount' => $order_total, 'CurrencyCode' => get_woocommerce_currency(), 'InvoiceDescription' => apply_filters('woocommerce_eway_description', '', $order), 'InvoiceNumber' => ltrim($order->get_order_number(), _x('#', 'hash before order number', 'woocommerce')), 'InvoiceReference' => $order->id), 'Customer' => array('FirstName' => $order->billing_first_name, 'LastName' => $order->billing_last_name, 'CompanyName' => substr($order->billing_company, 0, 50), 'Street1' => $order->billing_address_1, 'Street2' => $order->billing_address_2, 'City' => $order->billing_city, 'State' => $order->billing_state, 'PostalCode' => $order->billing_postcode, 'Country' => $order->billing_country, 'Email' => $order->billing_email, 'Phone' => $order->billing_phone));
     // Add customer ID if logged in
     if (is_user_logged_in()) {
         $request['Options'][] = array('customerID' => get_current_user_id());
     }
     return $this->perform_request('/CreateAccessCode.json', json_encode($request));
 }

 /**
  * Set the subscription prices to be used in calculating totals by @see WC_Subscriptions_Cart::calculate_subscription_totals()
  *
  * @since 1.4
  */
 public static function maybe_set_apporitioned_totals($total)
 {
     global $woocommerce;
     if (false === self::cart_contains_subscription_switch()) {
         return $total;
     }
     // Maybe charge an initial amount to account for upgrading from a cheaper subscription
     $apportion_recurring_price = get_option(WC_Subscriptions_Admin::$option_prefix . '_apportion_recurring_price', 'no');
     $apportion_sign_up_fee = get_option(WC_Subscriptions_Admin::$option_prefix . '_apportion_sign_up_fee', 'no');
     $apportion_length = get_option(WC_Subscriptions_Admin::$option_prefix . '_apportion_length', 'no');
     foreach ($woocommerce->cart->get_cart() as $cart_item_key => $cart_item) {
         if (!isset($cart_item['subscription_switch']['subscription_key'])) {
             continue;
         }
         $old_subscription_key = $cart_item['subscription_switch']['subscription_key'];
         $item_data = $cart_item['data'];
         $product_id = empty($cart_item['variation_id']) ? $cart_item['product_id'] : $cart_item['variation_id'];
         $product = get_product($product_id);
         // Set the date on which the first payment for the new subscription should be charged
         $woocommerce->cart->cart_contents[$cart_item_key]['subscription_switch']['first_payment_timestamp'] = $cart_item['subscription_switch']['next_payment_timestamp'];
         $is_virtual_product = 'no' != $item_data->virtual ? true : false;
         // Add any extra sign up fees required to switch to the new subscription
         if ('yes' == $apportion_sign_up_fee) {
             $old_subscription = WC_Subscriptions_Manager::get_subscription($old_subscription_key);
             $sign_up_fee_due = $product->subscription_sign_up_fee;
             if (self::order_contains_subscription_switch($old_subscription['order_id'])) {
                 $old_order = new WC_Order($old_subscription['order_id']);
                 $sign_up_fee_paid = $old_order->get_total();
             } else {
                 $sign_up_fee_paid = WC_Subscriptions_Order::get_item_sign_up_fee($old_subscription['order_id'], $old_subscription['product_id']);
             }
             $woocommerce->cart->cart_contents[$cart_item_key]['data']->subscription_sign_up_fee = max($sign_up_fee_due - $sign_up_fee_paid, 0);
         } elseif ('no' == $apportion_sign_up_fee) {
             // $0 the initial sign-up fee
             $woocommerce->cart->cart_contents[$cart_item_key]['data']->subscription_sign_up_fee = 0;
         }
         // Now lets see if we should add an apportioned amount to the sign-up fee (for upgrades) or extend the next payment date (for downgrades)
         if ('yes' == $apportion_recurring_price || 'virtual' == $apportion_recurring_price && $is_virtual_product) {
             // Get the current subscription
             $old_subscription = isset($old_subscription) ? $old_subscription : WC_Subscriptions_Manager::get_subscription($old_subscription_key);
             // Get the current subscription's original order
             $old_order = isset($old_order) ? $old_order : new WC_Order($old_subscription['order_id']);
             // Get the current subscription's last payment date
             $last_payment_timestamp = WC_Subscriptions_Manager::get_last_payment_date($old_subscription_key, get_current_user_id(), 'timestamp');
             $days_since_last_payment = round((gmdate('U') - $last_payment_timestamp) / (60 * 60 * 24));
             // Get the current subscription's next payment date
             $next_payment_timestamp = $cart_item['subscription_switch']['next_payment_timestamp'];
             $days_until_next_payment = round(($next_payment_timestamp - gmdate('U')) / (60 * 60 * 24));
             // Find the number of days between the two
             $days_in_old_cycle = $days_until_next_payment + $days_since_last_payment;
             // Find the $price per day for the old subscription's recurring total
             $old_recurring_total = WC_Subscriptions_Order::get_item_recurring_amount($old_subscription['order_id'], $old_subscription['product_id']);
             $old_price_per_day = $old_recurring_total / $days_in_old_cycle;
             // Find the price per day for the new subscription's recurring total
             // If the subscription uses the same billing interval & cycle as the old subscription,
             if ($item_data->subscription_period == $old_subscription['period'] && $item_data->subscription_period_interval == $old_subscription['interval']) {
                 $days_in_new_cycle = $days_in_old_cycle;
                 // Use $days_in_old_cycle to make sure they're consistent
                 $new_price_per_day = $product->subscription_price / $days_in_old_cycle;
             } else {
                 // We need to figure out the price per day for the new subscription based on its billing schedule
                 switch ($item_data->subscription_period) {
                     case 'day':
                         $days_in_new_cycle = $item_data->subscription_period_interval;
                         break;
                     case 'week':
                         $days_in_new_cycle = $item_data->subscription_period_interval * 7;
                         break;
                     case 'month':
                         $days_in_new_cycle = $item_data->subscription_period_interval * 30.4375;
                         // Average days per month over 4 year period
                         break;
                     case 'year':
                         $days_in_new_cycle = $item_data->subscription_period_interval * 365.25;
                         // Average days per year over 4 year period
                         break;
                 }
                 $new_price_per_day = $product->subscription_price / $days_in_new_cycle;
             }
             // If the customer is upgrading, we may need to add a gap payment to the sign-up fee or to reduce the pre-paid period (or both)
             if ($old_price_per_day < $new_price_per_day) {
                 // The new subscription may be more expensive, but it's also on a shorter billing cycle, so reduce the next pre-paid term
                 if ($days_in_old_cycle > $days_in_new_cycle) {
                     // Find out how many days at the new price per day the customer would receive for the total amount already paid
                     // (e.g. if the customer paid $10 / month previously, and was switching to a $5 / week subscription, she has pre-paid 14 days at the new price)
                     $pre_paid_days = 0;
                     do {
                         $pre_paid_days++;
                         $new_total_paid = $pre_paid_days * $new_price_per_day;
                     } while ($new_total_paid < $old_recurring_total);
                     // If the total amount the customer has paid entitles her to more days at the new price than she has received, there is no gap payment, just shorten the pre-paid term the appropriate number of days
                     if ($days_since_last_payment < $pre_paid_days) {
                         $woocommerce->cart->cart_contents[$cart_item_key]['subscription_switch']['first_payment_timestamp'] = $last_payment_timestamp + $pre_paid_days * 60 * 60 * 24;
                         // If the total amount the customer has paid entitles her to the same or less days at the new price then start the new subscription from today
                     } else {
//.........这里部分代码省略.........

    /**
     * Callback for the [subscriptions] shortcode that displays subscription names for a particular user.
     *
     * @param array $attributes Shortcode attributes.
     * @return string
     */
    public static function do_subscriptions_shortcode($attributes)
    {
        $attributes = wp_parse_args($attributes, array('user_id' => 0, 'status' => 'active'));
        $status = $attributes['status'];
        $subscriptions = WC_Subscriptions_Manager::get_users_subscriptions($attributes['user_id']);
        if (empty($subscriptions)) {
            return '<ul class="user-subscriptions no-user-subscriptions">
						<li>No subscriptions found.</li>
					</ul>';
        }
        $list = '<ul class="user-subscriptions">';
        foreach ($subscriptions as $subscription) {
            if ($subscription['status'] == $status || $status == 'all') {
                $list .= sprintf('<li>%s</li>', WC_Subscriptions_Order::get_item_name($subscription['order_id'], $subscription['product_id']));
            }
        }
        $list .= '</ul>';
        return $list;
    }

 /**
  * If a gateway doesn't manage payment schedules, then we should suspend the subscription until it is paid (i.e. for manual payments
  * or token gateways like Stripe). If the gateway does manage the scheduling, then we shouldn't suspend the subscription because a 
  * gateway may use batch processing on the time payments are charged and a subscription could end up being incorrectly suspended.
  *
  * @param $user_id int The id of the user whose subscription should be put on-hold.
  * @param $subscription_key string A subscription key of the form created by @see self::get_subscription_key()
  * @since 1.2.5
  */
 public static function maybe_put_subscription_on_hold($user_id, $subscription_key)
 {
     global $woocommerce;
     $subscription = self::get_users_subscription($user_id, $subscription_key);
     if (empty($subscription) || $subscription['status'] == 'on-hold') {
         return false;
     }
     $order = new WC_Order($subscription['order_id']);
     $payment_gateways = $woocommerce->payment_gateways->payment_gateways();
     $order_uses_manual_payments = WC_Subscriptions_Order::requires_manual_renewal($order) ? true : false;
     // If the subscription is using manual payments, the gateway isn't active or it manages scheduled payments
     if ($order_uses_manual_payments || !isset($payment_gateways[$order->payment_method]) || !$payment_gateways[$order->payment_method]->supports('gateway_scheduled_payments')) {
         self::put_subscription_on_hold($user_id, $subscription_key);
     }
 }

">
					<?php 
        }
        ?>
						<?php 
        echo WC_Subscriptions_Order::get_item_name($subscription_details['order_id'], $subscription_details['product_id']);
        ?>
					<?php 
        if (false !== $product) {
            ?>
					</a>
					<?php 
        }
        ?>
					<?php 
        $order_item = WC_Subscriptions_Order::get_item_by_product_id($order, $subscription_details['product_id']);
        ?>
					<?php 
        if (WC_Subscriptions::is_woocommerce_pre('2.4')) {
            ?>
						<?php 
            $item_meta = new WC_Order_Item_Meta($order_item['item_meta'], $product);
            ?>
					<?php 
        } else {
            ?>
						<?php 
            $item_meta = new WC_Order_Item_Meta($order_item, $product);
            ?>
					<?php 
        }

 /**
  * If requesting a payment method change, replace the woocommerce_pay_shortcode() with a change payment form.
  *
  * @since 1.4
  */
 public static function maybe_replace_pay_shortcode()
 {
     global $woocommerce;
     if (!self::$is_request_to_change_payment) {
         return;
     }
     ob_clean();
     do_action('before_woocommerce_pay');
     echo '<div class="woocommerce">';
     if (!empty(self::$woocommerce_errors)) {
         foreach (self::$woocommerce_errors as $error) {
             $woocommerce->add_error($error);
         }
     }
     if (!empty(self::$woocommerce_messages)) {
         foreach (self::$woocommerce_messages as $message) {
             $woocommerce->add_message($message);
         }
     }
     $subscription_key = $_GET['change_payment_method'];
     $subscription = WC_Subscriptions_Manager::get_subscription($subscription_key);
     if (wp_verify_nonce($_GET['_wpnonce'], __FILE__) === false) {
         $woocommerce->add_error(__('There was an error with your request. Please try again.', WC_Subscriptions::$text_domain));
         $woocommerce->show_messages();
     } elseif (!WC_Subscriptions_Manager::user_owns_subscription($subscription_key)) {
         $woocommerce->add_error(__('That doesn\'t appear to be one of your subscriptions.', WC_Subscriptions::$text_domain));
         $woocommerce->show_messages();
     } elseif (empty($subscription)) {
         $woocommerce->add_error(__('Invalid subscription.', WC_Subscriptions::$text_domain));
         $woocommerce->show_messages();
     } elseif (!WC_Subscriptions_Manager::can_subscription_be_changed_to('new-payment-method', $subscription_key, get_current_user_id())) {
         $woocommerce->add_error(__('The payment method can not be changed for that subscription.', WC_Subscriptions::$text_domain));
         $woocommerce->show_messages();
     } else {
         $order = new WC_Order($subscription['order_id']);
         $order_id = absint($_GET['order_id']);
         $order_key = urldecode($_GET['order']);
         $product_id = $subscription['product_id'];
         $next_payment_timestamp = WC_Subscriptions_Order::get_next_payment_timestamp($order, $product_id);
         if (!empty($next_payment_timestamp)) {
             $next_payment_string = sprintf(__(' Next payment is due %s.', WC_Subscriptions::$text_domain), date_i18n(woocommerce_date_format(), $next_payment_timestamp));
         } else {
             $next_payment_string = '';
         }
         $woocommerce->add_message(sprintf(__('Choose a new payment method.%s', WC_Subscriptions::$text_domain), $next_payment_string));
         $woocommerce->show_messages();
         if ($order->order_key == $order_key) {
             // Set customer location to order location
             if ($order->billing_country) {
                 $woocommerce->customer->set_country($order->billing_country);
             }
             if ($order->billing_state) {
                 $woocommerce->customer->set_state($order->billing_state);
             }
             if ($order->billing_postcode) {
                 $woocommerce->customer->set_postcode($order->billing_postcode);
             }
             // Show form
             WC_Subscriptions_Order::$recurring_only_price_strings = true;
             woocommerce_get_template('checkout/form-change-payment-method.php', array('order' => $order, 'subscription_key' => $subscription_key), '', plugin_dir_path(WC_Su