Yes. Customers can leave feedback after their purchase of your product. Maintaining  high feedback ratings and reviews is a very important factor for success on Amazon India Marketplace. It is a good way for customers to recognize you as a trustworthy seller. Your rating will appear on the Offer Listing Page and It is one of the most important things the customers will see. Your Reviews and feedback rating is an important metric which is used by Amazon India to measure your performance on Amazon Seller Central.