Yes, you are right. I'm working with precentage based discounts. I can't really user flat-rate discounts on my shop, I'm afraid.
Here is the log for the error;
05-04-2015 @ 11:46:50 - Start Express Checkout
05-04-2015 @ 11:46:51 - Test Mode: no
05-04-2015 @ 11:46:51 - Endpoint: https://api-3t.paypal.com/nvp
05-04-2015 @ 11:46:51 - Request: Array
(
[USER] => *****
[PWD] => *****
[VERSION] => 112.0
[BUTTONSOURCE] => AngellEYE_SP_WooCommerce
[SIGNATURE] => *****
[METHOD] => SetExpressCheckout
[RETURNURL] => http://www.xxxxx.no/kassen/se-gjennom-bestilling/?pp_action=revieworder
[CANCELURL] => http://www.xxxxx.no/handlekurv/
[ADDROVERRIDE] => 1
[BRANDNAME] => hundenmin.no
[CUSTOMERSERVICENUMBER] => 47 416 10 616
[SOLUTIONTYPE] => Sole
[LANDINGPAGE] => Billing
[USERSELECTEDFUNDINGSOURCE] => CreditCard
[PAYMENTREQUEST_0_AMT] => 135.00
[PAYMENTREQUEST_0_CURRENCYCODE] => NOK
[PAYMENTREQUEST_0_SHIPPINGAMT] => 0.00
[PAYMENTREQUEST_0_TAXAMT] => 0.00
[PAYMENTREQUEST_0_SHIPTONAME] => John Doe
[PAYMENTREQUEST_0_SHIPTOSTREET] => Streetname
[PAYMENTREQUEST_0_SHIPTOCITY] => Townname
[PAYMENTREQUEST_0_SHIPTOZIP] => 0000
[PAYMENTREQUEST_0_SHIPTOCOUNTRYCODE] => NO
[PAYMENTREQUEST_0_SHIPTOPHONENUM] => 12345678
[PAYMENTREQUEST_0_PAYMENTACTION] => Sale
[L_PAYMENTREQUEST_0_NAME0] => Treningsgodbiter - Smak godbiter: Kylling
[L_PAYMENTREQUEST_0_AMT0] => 270.00
[L_PAYMENTREQUEST_0_QTY0] => 1
[L_PAYMENTREQUEST_0_NAME1] => Cart Discount
[L_PAYMENTREQUEST_0_NUMBER1] => anders
[L_PAYMENTREQUEST_0_QTY1] => 1
[L_PAYMENTREQUEST_0_AMT1] => -108.00
[PAYMENTREQUEST_0_ITEMAMT] => 162
)
05-04-2015 @ 11:46:51 - Response: Array
(
[TIMESTAMP] => 2015-05-04T09:46:51Z
[CORRELATIONID] => 1b0970b895d23
[ACK] => Failure
[VERSION] => 112.0
[BUILD] => 16493693
[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
)
05-04-2015 @ 11:46:51 - SetExpressCheckout API call failed.
05-04-2015 @ 11:46:51 - Detailed Error Message: The totals of the cart item amounts do not match order amounts.
05-04-2015 @ 11:46:51 - Short Error Message: Transaction refused because of an invalid argument. See additional error messages for details.
05-04-2015 @ 11:46:51 - Error Code: 10413
05-04-2015 @ 11:46:51 - Error Severity Code: Error
Any way I can use a quickfix for this, so I can get this running? :)