paypal - 小计 (ITEMAMT) 为 $0.00 时出错

Question

当我尝试使用带有 0.00 美元小计的 PayPal API 时，我收到错误:

[10413] => The totals of the cart item amounts do not match order amounts.

这是传递给 SetExpressCheckout 的请求数据(个人信息替换为 ...):

    [0] => L_PAYMENTREQUEST_0_AMT0=9.99
    [1] => L_PAYMENTREQUEST_0_NAME0=Name
    [2] => L_PAYMENTREQUEST_0_QTY0=1
    [3] => L_PAYMENTREQUEST_0_NUMBER0=1
    [4] => L_PAYMENTREQUEST_0_AMT1=-9.99
    [5] => L_PAYMENTREQUEST_0_NAME1=Discount
    [6] => L_PAYMENTREQUEST_0_QTY1=1
    [7] => L_PAYMENTREQUEST_0_NUMBER1=0
    [8] => PAYMENTREQUEST_0_AMT=2.51
    [9] => PAYMENTREQUEST_0_ITEMAMT=0.00
    [10] => PAYMENTREQUEST_0_SHIPPINGAMT=2.38
    [11] => PAYMENTREQUEST_0_TAXAMT=0.13
    [12] => PAYMENTREQUEST_0_SHIPTONAME=...
    [13] => PAYMENTREQUEST_0_SHIPTOSTREET=...
    [14] => PAYMENTREQUEST_0_SHIPTOSTREET2=...
    [15] => PAYMENTREQUEST_0_SHIPTOCITY=...
    [16] => PAYMENTREQUEST_0_SHIPTOSTATE=...
    [17] => PAYMENTREQUEST_0_SHIPTOCOUNTRYCODE=...
    [18] => PAYMENTREQUEST_0_SHIPTOZIP=...
    [19] => PAYMENTREQUEST_0_SHIPTOPHONENUM=...
    [20] => CANCELURL=...
    [21] => RETURNURL=...
    [22] => NOSHIPPING=1
    [23] => ALLOWNOTE=0

我怎样才能让它工作？

Answer 1

“PAYMENTREQUEST_0_ITEMAMT=0.00”必须大于零。

https://www.paypalobjects.com/webstatic/en_US/developer/docs/pdf/pp_nvpapi_developerguide.pdf第 72 页

[....字符长度和限制:值是一个正数，任何货币都不能超过 10,000 美元.....]