I'm using CBA (HTML Integration). After all steps are done, Amazon redirects to custom confirmation page with GET amznPmtsOrderIds. Then I'm trying to get Order details with MWS API (Action=GetOrder), it returns XML, but that XML doesn't contain important information such as: BuyerName, PostalCode, AddressLine1 and etc., because Order is still pending.
So how can I receive Order details + Order items after I have been redirected to confirmation page, knowing only Amazon Order Id?
After long searching for my question, found solution, On Checkout Pipeline Settings > Merchant URL, Amazon will send XML to it with all required data! – Oleg Andreyev Sep 27 '12 at 8:21