Paypal добавить в корзину форму нескольких товаров со скидкой

Я использую PayPalMerchantSDK для интеграции корзины.

Для вашего ответа я использую этот сценарий, так как мне нужно отправить корзину в PayPal с помощью кнопки экспресс-оплаты. Также в моей корзине есть ваучер на скидку, который можно применить на общую сумму. Я использую решения Asp.Net MVC

Пожалуйста, следуйте коду и инструкциям по интеграции платежей PayPal.

Шаг 1. Загрузите и отправьте ссылку на PayPal_Merchant_SDK.dll

Шаг 2. Добавьте необходимые настройки в файл web.config для служб PayPal_Merchant_SDK.

Шаг 3. В контроллере корзины «Платежное действие» добавьте следующий код.

    [HttpPost]
    public ActionResult Payment()
    {
        var basketForPayment = GetBasket();
        if (basketForPayment.Order == null || basketForPayment.OrderItem.Count <= 0 || basketForPayment.Order.DVEcomOrderStatus.ID != (int)DvEcomOrderStatusEnum.Initiated) { return View("basket-empty", new DvClientViewModel(UrlBasketEmptyPage, Languages.English)); }


        //Paypal Expresscheckout Integration===============================

        // Step 1: Create the paypal request object
        var request = new SetExpressCheckoutRequestType();
        PopulatePaypalRequestObject(request, basketForPayment);

        // Step 2: Invoke the API
        SetExpressCheckoutReq getTockenWrapper = new SetExpressCheckoutReq();
        getTockenWrapper.SetExpressCheckoutRequest = request;
        PayPalAPIInterfaceServiceService service = new PayPalAPIInterfaceServiceService();
        SetExpressCheckoutResponseType setEcResponse = service.SetExpressCheckout(getTockenWrapper);

        // Step 3: Check for API return status and get the payment tocken
        HttpContext currContext = System.Web.HttpContext.Current;
        currContext.Items.Add("paymentDetails", request.SetExpressCheckoutRequestDetails.PaymentDetails);
        var currResponseContext = SetPayPalKeyResponseObjects(service, setEcResponse);

        var responseobject = (Dictionary<string, string>) currResponseContext.Items["Response_keyResponseObject"];
        if (responseobject["API Status"] != "SUCCESS")
        {
            return View("Invalid-basket", new DvClientViewModel(UrlBasketEmptyPage, Languages.English));
        }

        //Step 4: Make Payment with the tocken
        var tocken = responseobject["EC token"];
        string queryString = "https://www.sandbox.paypal.com/webscr?cmd=_express-checkout";
        if(!string.IsNullOrEmpty(tocken))
        {

            //Update Order with the transaction token
            _orderRepository.UpdateOrder(model.Order.OrderNumber, tocken);

            queryString += string.Format("&token={0}", tocken);
            Response.Redirect(queryString);
        }

        return RedirectToAction("Payment");
    }

Шаг 4. Ваше действие в ответ на платеж

    public ActionResult PaymentResponse()
    {
        // If we have a SECURE_SECRET then validate the incoming data using the MD5 hash
        //included in the incoming data
        if (Request.QueryString["token"].Length > 0 && Request.QueryString["PayerID"].Length > 0 )
        {
            var token = Request.QueryString["token"];
            var payerId = Request.QueryString["PayerID"];
            var order = _orderRepository.GetOrderTransaction(token);

            if(order !=null)
            {
                //Update Order with the transaction token
                _orderRepository.UpdateOrderSuccess(order.OrderNumber, token, payerId);
            }

            PaymentResponseClearSessionAndCookie();
            Response.Redirect("/");

        }

        return View("Invalid-basket", new DvClientViewModel(UrlBasketEmptyPage, Languages.English));

    }

Шаг 5. Подготовьте корзину для PayPal

   private void PopulatePaypalRequestObject(SetExpressCheckoutRequestType request, DvEcomOrderViewModel basket)
    {
        var ecDetails = new SetExpressCheckoutRequestDetailsType();
        ecDetails.ReturnURL = ConfigurationManager.AppSettings["PayPalReturnUrl"];            ecDetails.CancelURL = ConfigurationManager.AppSettings["PayPalCancelUrl"];            ecDetails.BuyerEmail = basket.Order.CustomerEmailAddress;

        //Fix for release
        ecDetails.AddressOverride = "0";
        ecDetails.NoShipping = "1";

        /* Populate payment requestDetails. 
         * SetExpressCheckout allows parallel payments of upto 10 payments. 
         * This samples shows just one payment.
         */
        var paymentDetails = new PaymentDetailsType();
        ecDetails.PaymentDetails.Add(paymentDetails);
        double orderTotal = 0.0;
        double itemTotal = 0.0;
        var currency = (CurrencyCodeType)
            Enum.Parse(typeof(CurrencyCodeType), ConfigurationManager.AppSettings["PayPalCurrency"]);


        paymentDetails.OrderTotal = new BasicAmountType(currency, orderTotal.ToString(CultureInfo.InvariantCulture));
        orderTotal += Double.Parse(basket.Order.SubTotal.ToString(CultureInfo.InvariantCulture)); // Subtotal

        paymentDetails.ShippingTotal = new BasicAmountType(currency, basket.Order.DeliveryAmount.ToString(CultureInfo.InvariantCulture)); // Add delivery charge
        orderTotal += Double.Parse(basket.Order.DeliveryAmount.ToString(CultureInfo.InvariantCulture));

        paymentDetails.TaxTotal = new BasicAmountType(currency, basket.Order.VAT.ToString(CultureInfo.InvariantCulture)); //Add Vat Tax
        orderTotal += Double.Parse(basket.Order.VAT.ToString(CultureInfo.InvariantCulture));

        //paymentDetails.ShippingDiscount = new BasicAmountType(currency, basket.Order.DiscountAmount.ToString(CultureInfo.InvariantCulture)); // Subtract discount
        orderTotal -= Double.Parse(basket.Order.DiscountAmount.ToString(CultureInfo.InvariantCulture));


        paymentDetails.OrderDescription = string.Format("Payment for the basket order {0}", basket.Order.OrderNumber);

        paymentDetails.PaymentAction = (PaymentActionCodeType)
            Enum.Parse(typeof(PaymentActionCodeType), "SALE");


        AddressType shipAddress = new AddressType();
        shipAddress.Name = string.Format("{0} {1}", basket.Order.DeliveryFirstName, basket.Order.DeliverySurname);
        shipAddress.Street1 = basket.Order.BillingAddress1;
        shipAddress.Street2 = basket.Order.BillingAddress2 ?? "-";
        shipAddress.CityName = basket.Order.DeliveryTown ?? "-";
        shipAddress.StateOrProvince = basket.Order.DeliveryCounty;
        shipAddress.Country = (CountryCodeType)
            Enum.Parse(typeof(CountryCodeType), "GB");
        shipAddress.PostalCode = basket.Order.DeliveryPostcode;

        //Fix for release
        shipAddress.Phone = basket.Order.DeliveryTelePhone;

        ecDetails.PaymentDetails[0].ShipToAddress = shipAddress;


        // Each payment can include requestDetails about multiple items
        // This example shows just one payment item

        //ApplyDiscount
        if (basket.Order.DiscountAmount > 0)
        {
            decimal disAmt = basket.Order.DiscountAmount -
                             (basket.Order.DiscountAmount + basket.Order.DiscountAmount);
            PaymentDetailsItemType discount = new PaymentDetailsItemType();
            discount.Amount = new BasicAmountType(currency, disAmt.ToString(CultureInfo.InvariantCulture));
            discount.Description = "Discount Applied";
            discount.Name = "Voucher Code";
            paymentDetails.PaymentDetailsItem.Add(discount);
        }

        var itemDetails = new PaymentDetailsItemType();
        foreach (var item in basket.OrderItem)
        {                
            itemDetails.Name = item.ProductName;
            itemDetails.Amount = new BasicAmountType(currency, item.UnitPrice.ToString(CultureInfo.InvariantCulture));
            itemDetails.Quantity = Int32.Parse(item.Quantity.ToString(CultureInfo.InvariantCulture));
            itemDetails.ItemCategory = (ItemCategoryType)
            Enum.Parse(typeof(ItemCategoryType), "0");
            itemTotal += Double.Parse(item.UnitPrice.ToString(CultureInfo.InvariantCulture)) * itemDetails.Quantity.Value;

            itemDetails.Tax = new BasicAmountType(currency, item.VAT.ToString(CultureInfo.InvariantCulture));

            itemDetails.Description = item.ProductName;


            paymentDetails.PaymentDetailsItem.Add(itemDetails);
        }

        itemTotal -= Double.Parse(basket.Order.DiscountAmount.ToString(CultureInfo.InvariantCulture));
        paymentDetails.ItemTotal = new BasicAmountType(currency, itemTotal.ToString(CultureInfo.InvariantCulture));
        paymentDetails.OrderTotal = new BasicAmountType(currency, orderTotal.ToString(CultureInfo.InvariantCulture));

        request.SetExpressCheckoutRequestDetails = ecDetails;
    }

Шаг 6. Вам больше не с чего начинать...

Шаг 7: Вышеуказанные шаги приведут вас к успешной транзакции PayPal. Затем вам нужно авторизовать реальную транзакцию с помощью другого вызова функции Paypal Authorize API с помощью метода Post. Процесс аналогичен описанной выше процедуре.

Я нашел решение, хотя и немного длинное, но оно все же делает свое дело.

Я сделал код js, что-то вроде:

var coup1="Disc1";
var coup2="Disc2";
var coup3="Disc3";
var coup4="Disc4";



function CalculateOrder(form) {

if (form.text1.value == coup1 && (form.os0.value == "item2" || form.os0.value == "item3" || form.os0.value == "item4" || form.os0.value == "item5"))

{

form.discount_amount.value = "5";

}

if (form.text1.value == coup2 && (form.os0.value == "item3" || form.os0.value == "item4" || form.os0.value == "item5"))

{

form.discount_amount.value = "10";

}



if (form.text1.value == coup3 && (form.os0.value == "item4" || form.os0.value == "item5"))

{

form.discount_amount.value = "20";

}


if (form.text1.value == coup4 && (form.os0.value == "item5"))

{

form.discount_amount.value = "50";

}

}