Hi Varun -
When looking at WMS systems for both e-commerce and retail stores make sure to choose a Best of Breed solution found on Gartner's Magic Quadrant of leading WMS's. These will be the best WMS solutions and have been recognized for their functionality for these requirements. Snapfulfil by Synergy Logistics is listed and may be a fit for your requirements. The solution is a Software as a Service (SaaS) solution and works very well for ecommerce/retail company's building their business without utilizing Capital for a WMS solution. I'd like to learn more about your business when you have a moment free for a call.