I see there are some people that got Amazon’s payment module working w/ Magento 1.5 and 1.6
I’m on 1.6.1 and I ALMOST have it working. Everything works great in Sandbox mode, when I have “Sign_XML_Cart” option disabled from the Magento side and also have it disabled from the Amazon side in the Checkout Pipeline Settings.
However, when this option is enabled, as it needs to be in production mode, I get this error from Amazon:
The order could not be authenticated. Detail: Your signature [xxxxxxxxxxxxxxxxxxx=] does not match the signature that we expect.
Was anybody else able to solve this issue?