我正在尝试使用Paypal快速结账，我正在向API页面发送所有内容，但我们的要求有点奇怪，让我在数字中解释一下：
Service A price = $10
qty = 1
--------------------
Subtotal = $15 **(added $5 shipping to the subtotal)**
Tax = $2
================
Total = $17
While the default is where I was sending the price breakdown to Paypal gateway which was:
Service A price = $10
qty = 1
--------------------
Subtotal = $10
Shipping = $5
Tax = $2
=================
Total = $17
每当我检查 PAYMENTINFO_0_AMT 时，我从paypal收到此错误回复：
**PayPal response:**
TIMESTAMP -> 2014-03-11T21:34:36Z
L_ERRORCODE0 -> 10413
L_SHORTMESSAGE0 -> Transaction refused because of an invalid argument. See additional error messages for details.
L_LONGMESSAGE0 -> The totals of the cart item amounts do not match order amounts.
L_SEVERITYCODE0 -> Error
请帮助我发送小计并附上运费，而不会在Payapl付款页面向用户显示送货行。
谢谢，