Amazon Marketplace Web Service (Amazon MWS) is an integrated Web service API that helps Amazon sellers to programmatically exchange data on listings, orders, payments, reports, and more. By using Amazon MWS, sellers can increase selling efficiency, reduce labour requirements, and improve response time to customers.
To be eligible to use MWS, sellers must have a non-individual Selling on Amazon account or an Amazon Payments account. Sellers with only individual Selling on Amazon accounts are not eligible to register for or use MWS. If you are an individual seller and would like to use MWS, you can become eligible to register for MWS by upgrading to a Pro Merchant seller account from the 'Setting - Account Info' page in your Seller Central account.