Very few work. Many ICICICI debit cards work. A few Axis debit card rumored to work. Just a few months back, HDFC has allowed its debit cards on international websites.
If you're talking about 3D security enabled gateways, many indian debit cards are working. It doesn't matter if the website is domestic or international or intergalactic.
I've refilled entropay many times using my SBI debit card.
I think
flipkart owns its gateway, right?