I was looking for windows OS version of Json RPC for electrum but don't see any article from  google or any search engine. Because i was planning to accept bitcoinin my website and use electrum wallet as my wallet.
Looks like only works in debian/linux os.. But if you only had windows os in your side why not use the free 12 months trial of amazon aws you can start launch linux os in their ec2 for free and you can start your project to make your own payment gateway. Or use some third party like bitpay or gourl (for wordpress)