The Winn - Loyalty & Cashback app is a service that allows you to earn cashback rewards from the brands that you prefer. To start using the service, you will need to download the app and create an account. After that, you will be able to make purchases in the app, and every time you do, you will receive a coupon that you can redeem for cashback rewards. It is a very simple and easy process, and you will be able to make purchases from brands that you like, such as McDonald's, Burger King, KFC, Pizza Hut, Starbucks, and many others.