I came across this real time stats that Amazon has improved their conversion by 169% using One step Checkout. It is known that on any ecommerce stores, there are 90% of chances available for shopping cart abandonment. So in this case, reducing the number of steps in your checkout process will tend to increase your conversion rate on your ecommerce store. Find the real time stats here at http://apptha.com/blog/120-increase-...step-checkout/