Respected Client! I have read your post and understood that you want an e commerce app like flipkart.
Dear Client e commerce applications like flipkart, daraz e.t.c. are not small apps and are not so easy to build. The cost of these apps usually in lakhs.
But I have developed an e commerce app recently and I can provide that app to you in 15000 INR.
This app has following features:
1-Owner/You will be able to add categories ,subctegories and products in your app which will be uploaded on server.
2- You will be able to see reports of your sales.
3- You will be able to receive payments via paypal
4- Users/ Customers will able to do shopping from your app
5- Users/Customers will be able to add products to cart, see their cart and delete their cart.
6- Users/Customers will be able to pay you via paypal.
If you are interested then contact with me as soon as possible. I can provide you demo app immediately.