Hi Francis,
I had downloaded plugin and installed it and then your Magento module from your site and uploaded to the root of the Magento site before adding this support thread. I am puzzled why you are saying that I did not install your module as I have?
I had followed your instructions from your .pdf file with the exception that I left all of the attributes on and limit them to only your list.
Since I had the 404 I did not try and list products as the message said the API could not be verified. Are you saying that they should still list regardless?
Thanks
Steve