Hi,
Please activate the debug mode in the Migs plugin.
At this moment the plugin will show you the "CURL" error.
Maybe there is a firewall in your server so it can't connect to the migs server, or the CURL SSL module is not activated.
With the debug mode activated in the plugin, we will have more information to understand the problem.
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.