Paypal (NVP APIs) 如何为订单打折？

Question

例如，这是我的请求参数，订单总额是 270.00，如果我想使用优惠券($10.00)来打折这个订单，那么订单总额必须是 260.00，但是现在，我找不到任何关于此 api ( https://developer.paypal.com/docs/classic/api/merchant/SetExpressCheckout_API_Operation_NVP/ ) 中的折扣 AMT 参数，我忽略了吗？

Array(        
    [PAYMENTREQUEST_0_CURRENCYCODE] => USD
    [PAYMENTREQUEST_0_PAYMENTACTION] => Sale
    [PAYMENTREQUEST_0_AMT] => 270.00
    **[some parameter? DISCOUNT_AMT ?] => 10.00 // have this parameter ??**
    [PAYMENTREQUEST_0_ITEMAMT] => 219.00
    [PAYMENTREQUEST_0_SHIPPINGAMT] => 39.00
    [PAYMENTREQUEST_0_HANDLINGAMT] => 12.00
    [L_PAYMENTREQUEST_0_AMT0] => 219.00
    [L_PAYMENTREQUEST_0_QTY0] => 1
    [L_PAYMENTREQUEST_0_NAME0] => Goods title
    [L_PAYMENTREQUEST_0_DESC0] => Goods description
);

抱歉我的英语不好，谢谢哥们。

Answer 1

您需要将折扣添加为负值的附加行项目，然后相应地调整 ITEMAMT 和 AMT。

Array(        
[PAYMENTREQUEST_0_CURRENCYCODE] => USD
[PAYMENTREQUEST_0_PAYMENTACTION] => Sale
[PAYMENTREQUEST_0_AMT] => 260.00
[PAYMENTREQUEST_0_ITEMAMT] => 209.00
[PAYMENTREQUEST_0_SHIPPINGAMT] => 39.00
[PAYMENTREQUEST_0_HANDLINGAMT] => 12.00
[L_PAYMENTREQUEST_0_AMT0] => 219.00
[L_PAYMENTREQUEST_0_QTY0] => 1
[L_PAYMENTREQUEST_0_NAME0] => Goods title
[L_PAYMENTREQUEST_0_DESC0] => Goods description
[L_PAYMENTREQUEST_0_AMT1] => -10.00
[L_PAYMENTREQUEST_0_QTY1] => 1
[L_PAYMENTREQUEST_0_NAME1] => Discount
[L_PAYMENTREQUEST_0_DESC1] => Coupon Code ABC123

);