WC_Order::get_customer_order_notes PHP Method

    public function get_customer_order_notes()
    {
        $notes = array();
        $args = array('post_id' => $this->get_id(), 'approve' => 'approve', 'type' => '');
        remove_filter('comments_clauses', array('WC_Comments', 'exclude_order_comments'));
        $comments = get_comments($args);
        foreach ($comments as $comment) {
            if (!get_comment_meta($comment->comment_ID, 'is_customer_note', true)) {
                continue;
            }
            $comment->comment_content = make_clickable($comment->comment_content);
            $notes[] = $comment;
        }
        add_filter('comments_clauses', array('WC_Comments', 'exclude_order_comments'));
        return $notes;
    }

 /**
  * Redirect to allPay
  */
 public function receipt_page($order_id)
 {
     # Clean the cart
     global $woocommerce;
     $woocommerce->cart->empty_cart();
     $order = new WC_Order($order_id);
     try {
         $this->invoke_allpay_module();
         $aio = new AllInOne();
         $aio->Send['MerchantTradeNo'] = '';
         $service_url = '';
         if ($this->allpay_test_mode == 'yes') {
             $service_url = 'http://payment-stage.allpay.com.tw/Cashier/AioCheckOut';
             $aio->Send['MerchantTradeNo'] = date('YmdHis');
         } else {
             $service_url = 'https://payment.allpay.com.tw/Cashier/AioCheckOut';
         }
         $aio->MerchantID = $this->allpay_merchant_id;
         $aio->HashKey = $this->allpay_hash_key;
         $aio->HashIV = $this->allpay_hash_iv;
         $aio->ServiceURL = $service_url;
         $aio->Send['ReturnURL'] = add_query_arg('wc-api', 'WC_Gateway_Allpay', home_url('/'));
         $aio->Send['ClientBackURL'] = home_url('?page_id=' . get_option('woocommerce_myaccount_page_id') . '&view-order=' . $order->id);
         $aio->Send['MerchantTradeNo'] .= $order->id;
         $aio->Send['MerchantTradeDate'] = date('Y/m/d H:i:s');
         # Set the product info
         $aio->Send['TotalAmount'] = $order->get_total();
         array_push($aio->Send['Items'], array('Name' => '網路商品一批', 'Price' => $aio->Send['TotalAmount'], 'Currency' => $order->get_order_currency(), 'Quantity' => 1));
         $aio->Send['TradeDesc'] = 'allPay_module_woocommerce_1_0_3';
         # Get the chosen payment and installment
         $notes = $order->get_customer_order_notes();
         $choose_payment = '';
         $choose_installment = '';
         if (isset($notes[0])) {
             list($choose_payment, $choose_installment) = explode('_', $notes[0]->comment_content);
         }
         $aio->Send['ChoosePayment'] = $choose_payment;
         # Set the extend information
         switch ($aio->Send['ChoosePayment']) {
             case 'Credit':
                 # Do not support UnionPay
                 $aio->SendExtend['UnionPay'] = false;
                 # Credit installment parameters
                 if (!empty($choose_installment)) {
                     $aio->SendExtend['CreditInstallment'] = $choose_installment;
                     $aio->SendExtend['InstallmentAmount'] = $aio->Send['TotalAmount'];
                     $aio->SendExtend['Redeem'] = false;
                 }
                 break;
             case 'WebATM':
                 break;
             case 'ATM':
                 $aio->SendExtend['ExpireDate'] = 3;
                 $aio->SendExtend['PaymentInfoURL'] = $aio->Send['ReturnURL'];
                 break;
             case 'CVS':
             case 'BARCODE':
                 $aio->SendExtend['Desc_1'] = '';
                 $aio->SendExtend['Desc_2'] = '';
                 $aio->SendExtend['Desc_3'] = '';
                 $aio->SendExtend['Desc_4'] = '';
                 $aio->SendExtend['PaymentInfoURL'] = $aio->Send['ReturnURL'];
                 break;
             case 'Alipay':
                 $aio->SendExtend['Email'] = $order->billing_email;
                 $aio->SendExtend['PhoneNo'] = $order->billing_phone;
                 $aio->SendExtend['UserName'] = $order->billing_first_name . ' ' . $order->billing_last_name;
                 break;
             case 'Tenpay':
                 $aio->SendExtend['ExpireTime'] = date('Y/m/d H:i:s', strtotime('+3 days'));
                 break;
             case 'TopUpUsed':
                 break;
             default:
                 throw new Exception($this->tran('Invalid payment method.'));
                 break;
         }
         $aio->CheckOut();
         exit;
     } catch (Exception $e) {
         $this->add_error($e->getMessage());
     }
 }