mRova

Open plugins > ccavenue-payment-gateway-woocommerce > index.php.
Search for process_payment function and replace it with the following code.

function process_payment($order_id){
            $order = new WC_Order($order_id);
            return array('result' => 'success', 'redirect' => $order->get_checkout_payment_url( true ));
        }

http://www.mrova.com/woocommerce-ccavenue-gateway-by-mrova/#comment-1240669900