paypal TAXAMT錯誤

Question

我正在嘗試向交易添加TAXAMT。以下是查詢發送的內容：

&PAYMENTREQUEST_0_PAYMENTACTION=Authorization 
&RETURNURL=http://zzz.com/returnurl 
&CANCELURL=http://zzz.com/cancelurl 
&NOSHIPPING=1 
&PAYMENTREQUEST_0_CURRENCYCODE=USD 
&L_PAYMENTREQUEST_0_QTY0=1 
&L_PAYMENTREQUEST_0_NAME0=Shirt 
&L_PAYMENTREQUEST_0_AMT0=89.10 
&L_PAYMENTREQUEST_0_TAXAMT0=3.56 
&PAYMENTREQUEST_0_TAXAMT=3.56 
&PAYMENTREQUEST_0_AMT=92.66 

但由於某些原因，它不起作用。當我加入TAXAMT作爲一個正常的項目它經歷：

&PAYMENTREQUEST_0_PAYMENTACTION=Authorization 
&RETURNURL=http://zzz.com/returnurl 
&CANCELURL=http://zzz.com/cancelurl 
&NOSHIPPING=1 
&PAYMENTREQUEST_0_CURRENCYCODE=USD 
&L_PAYMENTREQUEST_0_QTY0=1 
&L_PAYMENTREQUEST_0_NAME0=Shirt 
&L_PAYMENTREQUEST_0_AMT0=89.10 
&L_PAYMENTREQUEST_0_QTY1=1 
&L_PAYMENTREQUEST_0_NAME1=Sales+Tax 
&L_PAYMENTREQUEST_0_AMT1=3.56 
&PAYMENTREQUEST_0_AMT=92.66 

誰能幫我找出問題與TAXAMT。此刻，我碰到下面的錯誤吧：

SetExpressCheckout API call failed. 
Detailed Error Message: The totals of the cart item amounts do not match order amounts. 
Short Error Message: Transaction refused because of an invalid argument. See additional error messages for details. 
Error Code: 10413 
Error Severity Code: Error 

Answer 1

你丟失：
&PAYMENTREQUEST_0_ITEMAMT=89.10

L_PAYMENTREQUEST_xxxxx指示單個項目的金額。
PAYMENTRQUEST_xxxx指示所有項目的總金額合計。