I get this message when i use magento to confirm the sales. PayPal gateway has rejected request. The transaction id is not valid (#10004: Transaction refused because of an invalid argument. See additional error messages for details).
My clients are also getting message that they could not make the payment at my website “Paypal gateway has rejected request, billing address is not enabled for merchant, request for billing address failed” even though my billing and shipping address have been setup in my account.