I'm using Prestashop 22.214.171.124 with the OneAll Social Plugin 1.7. I have verified that my server has php5_curl installed (using phpinfo() and a manual test), and that my firewall allows outgoing 443 connections (using telnet).
However, both the "Autodetect the best API connection settings" and the "Verify the API settings" display a "Contacting API - please wait..." message with a spinning icon when I click on them, and they never resolve to a success/error message. They just load forever (not literally, but you know what I mean!).
I have triple-checked the API credentials and they are correct.
When I try to use the authentication widget, it gives me an API connection error message, confirming that your plugin is unable to contact your API.
I'm running Prestashop from a HostUS VPS, could that be a source of the problem?