Hi Cornwolf, I just want to add, although the WP plugin is free, and as a developer I have access to the source – it has been a bit of a pulling hair out exercise.
Unfortunately this is what you get from a “free” solution.
But again I have to stress, this is by no means a polished product, and if you do not have the technical skills to fix the poor implementation, then this solution is going to lose you real money, when things on your site don’t work.