贝宝快速结账：应用顺序折扣 [英] Paypal Express Checkout: Apply order discount

问题描述

有电子商务网站运行ZNode。送税，运费，订单总额，等等，直到施加订单水平的折扣一切正常（比如50％）。我们从贝宝，上面写着以下内容的响应：

Have an ecommerce site running ZNode. We send tax, shipping, order total, etc. Everything works fine until an order level discount is applied (say 50%). We get a response from PayPal that says the following:

车项目金额不匹配的订单金额的合计

The totals of the cart item amounts do not match order amounts.

我穿越API，我找不到任何适用的订单水平的折扣。 FWIW，用户申请优惠码上我们的网站，然后被转移到贝宝。

I'm traversing the API, and I can't find anything to apply an order level discount. FWIW, the user is applying discount codes on our site, and then is being transferred to PayPal.

推荐答案

我觉得你的问题是不是PayPal的API。
你检查发现一切都运行完美你的参数传递到PayPal在这50％的折扣呢？

I think your problem is not the PayPal API. You checked that everything works perfect with your parameters passed to paypal in this 50% discount case?

PayPal的文档后，您应该提供一个负值，以反映订单上的折扣。所以一切加起来的总量

After the PayPal Documentation you should provide a negative value to reflect a discount on an order. So everything adds up to the total amount.

来源： https://cms.paypal.com/us/cgi-bin/?cmd=_render-content&content_ID=developer/e_howto_api_ECCustomizing

更新的代码（由尼克）

我有一个PayPal服务，做各种东西，但下面的代码应该给你的折扣是如何工作的。折扣是不是一种特殊类型，它就像任何其他的，除了它是通过命名它像一个折扣，设定它的价格为负数变相的产品。

I have a paypal service that does all kinds of stuff, but the following code should give you an idea of how the discount works. The discount is not a special type, it's a product just like any other except it's disguised by naming it like a discount and setting it's price to a negative number.

            List<PaymentDetailsItemType> items = paymentDetails.PaymentDetailsItem;

        foreach (ShoppingCartItem item in cart.ShoppingCartItems)
        {
            items.Add(new PaymentDetailsItemType
                          {
                              Name = item.Book.Title,
                              Quantity = item.Quantity,
                              Number = item.BookId.ToString(),
                              Amount =
                                  new BasicAmountType
                                      {currencyID = CurrencyCodeType.USD, 
                                       value = (item.Book.Price).To2Places()}
                          });
        }
        if (cartTotals.Discount > 0)
        {
            items.Add(new PaymentDetailsItemType
                          {
                              Name = "Promo Code Discount",
                              Quantity = 1,
                              Number = "PromoCode",
                              Amount =
                                  new BasicAmountType
                                      {
                                          currencyID = CurrencyCodeType.USD,
                                          value = (cartTotals.Discount*-1).To2Places()
                                      }
                          });
        }

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