This worked for me when I was getting Google base error: Expected response code 200, got 400.
I am now running 3 Sites with Magento. Two are Traditional Shopping cart sites, but the my newest one had to be an affiliate style site. What I mean by an affiliate site is that when you click on the buy it now button you are taken to a 3rd party website to complete the sale. Magento does not do this out of the box, it took a long sleepless night for me to figure out how to do this….