@sathishmanohar, Hello from Chenna!. :)
It is this specific case that we are solving for Indian startups along with a global billing solution at ChargeBee.
Regardless of whether you need ChargeBee or not, shoot me an email (in profile) and will be happy to share the options available.
Specific to your question: Without SSN even after incorporation in Delaware it is a struggle to get a merchant account. I have helped a few businesses in India get merchant account there and it is from my experience. I incorporated ChargeBee in Delaware, but thankfully I have SSN. Without revenue not many merchant account providers that claim to do this won't touch you; that is just reality.
My suggestion to startups is: use the easiest available options to get started - we do it with PayPal, 2Checkout etc., I know it is not anywhere near what you can do with Stripe or a BraintreePayments, but you can do with the available options, build traction and focus on the hardest problem - which is getting attention of your customers and get some early adopters. In the meantime, we can help you started with other options and seamlessly switch over for new signups. You will save $1k USD initially plus all the additional paper work, franchisee tax (even incorporating in October will entitle you to pay $440 USD in tax in March next year - delay it by couple of months you save that as well).
But, if you do want to go ahead with incorporation here are couple of blogs: Girish of Freshdesk wrote about this and I wrote a followup on payments as well.
You can read those here:
http://blog.freshdesk.com/how-to-incorporate-a-us-corporatio...
http://blog.chargebee.com/payment-integration-options-for-st...
We are also working with couple of Indian banks and in turn with Reserve Bank of India to solve it well. We should have something soon to avoid all this round about way of incorporating outside to do something straightforward.