Hi again! Typically when I hear back from a developer, I reword their response to make it more palatable to the less tech-savvy among us (myself included). Here, I don’t want any of the message to be lost, so I’m copying and pasting. :)
We use the default setting for POSTs, and that will verify the certificate for SSL addresses. More info on this is here. You either need a valid certificate, or your test environment needs to be available on port 80, which basically means it can be accessed via http instead of https. Probably not highly recommended, but it would get it working.