Some of our plugin require a server functionality called cURL.
You can check to see if you have cURL enabled on your server by visiting here:
Go to your website admin area: WooCommerce > Status > Server Environment
Most plugins require:
cURL, Remote Post, Remote Get
Remote Post and Remote Get enable you to communicate to servers (External API'S) outside of your own server. Most shipping plugins, payment gateways and Licence key activation require these server parameters to function.