Tweak WordPress + WooCommerce plugin

We're using - Wordpress+ WooCommerce. Our store's base currency is USD & we're using PayPal for international customers. We want to use ccAvenue (INR) as the payment gateway for Indian customers. Unfortunately, ccAvenue does not read currency. So $12 would be pushed out from our website and ccAvenue would read it as INR 12 instead of the correct amount ~INR 600. We want the amount be converted on-the-fly (from USD to INR) so that our website sends the correct amount to ccAvenue. Preferably this should be done within the plugin using a real-time currency conversion service. But, we're open to crude workarounds - like manually updating the conversion rate twice a week, etc. Here's the link to the free ccavenue woocommerce plugin: [login to view URL] Attaching the [login to view URL] of the saame plugin.