It is asking me to download an SDK from paypal and upload it to the server. I found this link where you can download the paypal SDK: https://cms.paypal.com/us/cgi-bin/?...ID=developer/library_download_sdks#PayflowPro But it might as well be in Chinese. I have no idea what I am supposed to download and install and where? I'm at a loss on this one. Anyone know anything about this?
I know this is an old post but thought I would go ahead and provide an "answer" for the question. The Payflow plugin is using the HTTPS interface from what I can tell of the plugins code so there should be nothing you need to download and install on the server for this to work. The page you found is an area of for developers of such integrations as Alex has provided.