I'm getting this error with [login to view URL], when someone uses the coupon code "fall10" when they get to the payment page, and use a credit card, and try to check out it says this when they click "PLACE ORDER"
See attached screenshot.
PayPal gateway has rejected request. The totals of the cart item amounts do not match order amounts (#10413: Transaction refused because of an invalid argument. See additional error messages for details).