Not working with HTTPS

Woocommerce CCavenue plugin not working.
I recently changed my website from http to https. I am using Cloudflare flexible SSL and self signed ssl on my server. I am able to make payment but the response send by CCAvenue is not catching by the plugin. I tried to troubleshoot the problem, it seems like it fails here : if(isset($_REQUEST[‘encResp’])

https://wordpress.org/plugins/ccavenue-payment-gateway-woocommerce/