PayPal エクスプレス チェックアウトを使用していますが、割引コードに問題があります。以下は私のパラメータです：
PAYMENTREQUEST_0_CURRENCYCODE=CAD
&L_PAYMENTREQUEST_0_NAME0=test
&L_PAYMENTREQUEST_0_NUMBER0=
&L_PAYMENTREQUEST_0_AMT0=125.00
&L_PAYMENTREQUEST_0_QTY0=1
&PAYMENTREQUEST_0_ITEMAMT=125.00
&PAYMENTREQUEST_0_TAXAMT=0.00
&PAYMENTREQUEST_0_SHIPPINGAMT=0.00
&PAYMENTREQUEST_0_SHIPDISCAMT=0.00
&PAYMENTREQUEST_0_HANDLINGAMT=12.50
&PAYMENTREQUEST_0_AMT=112.50
次のエラーを返します
Array ( [TIMESTAMP] => 2013-09-02T08:45:26Z [CORRELATIONID] => b5acd1c6276c4
[ACK] => Failure
[VERSION] => 85.0
[BUILD] => 7539191
[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 )
誰でも助けることができますか？