i purchased your plugin last night and tried to set it up. whenever i enable it and create at least 1 rule it hangs my cart. i enabled debugging and i get:
Error: call to URL http://shippingapi.storepep.com/api/shippings/rates failed with status 502, response
Proxy Error
The proxy server received an invalid response from an upstream server.
The proxy server could not handle the request POST /api/shippings/rates.
Reason: Error reading from remote server
Apache/2.4.18 (Ubuntu) Server at shippingapi.storepep.com Port 80
, curl_error , curl_errno 0