我正在请求来自PayPal的setExpressCheckout调用，并收到错误代码10413。它工作得很好，直到我从项目总数中取出税款并在请求中添加 &PAYMENTREQUEST_0_TAXAMT。下面是请求网址：
https://api.sandbox.paypal.com/nvp?
METHOD=setExpressCheckout&VERSION=87.0
&USER=XXXXXXXXXX
&PWD=XXXXXXXXXX
&SIGNATURE=XXXXXXXXXX
&RETURNURL=XXXXXXXXXX
&CANCELURL=XXXXXXXXXX
&L_PAYMENTREQUEST_0_NAME0=Hy+Guardian+Fly+Rug
&L_PAYMENTREQUEST_0_NUMBER0=HY-FLY
&L_PAYMENTREQUEST_0_DESC0=Size%3A+4+ft+6%2C+Size%3A+4+ft+6%2C+Size%3A+4+ft+6%2C+Size%3A+4+ft+6
&L_PAYMENTREQUEST_0_AMT0=47.00
&L_PAYMENTREQUEST_0_QTY0=1
&PAYMENTREQUEST_0_CURRENCYCODE=GBP
&PAYMENTREQUEST_0_ITEMAMT=37.60
&PAYMENTREQUEST_0_SHIPPINGAMT=11.25
&PAYMENTREQUEST_0_TAXAMT=9.40
&PAYMENTREQUEST_0_AMT=58.25
根据我的评论，
您的总金额似乎与您的商品总金额不同。
即
&PAYMENTREQUEST_0_CURRENCYCODE=GBP
&PAYMENTREQUEST_0_ITEMAMT=37.60
&PAYMENTREQUEST_0_SHIPPINGAMT=11.25
&PAYMENTREQUEST_0_TAXAMT=9.40
&PAYMENTREQUEST_0_AMT=58.25
显示 58.25
还
L_PAYMENTREQUEST_0_AMT0=47.00
显示 47.00
价格不匹配可能会导致此问题;)