Strike, a payment app, has launched a new feature called Cashback, which allows users to earn cash rewards by making payments through the app. The app aims to disrupt the traditional payment processing industry by offering zero processing fees, unlike credit card companies that charge merchants high fees. By incentivizing users to use the app for payments, Strike hopes to encourage the adoption of Bitcoin and the Lightning Network as a settlement rail. The Cashback feature is currently available with select merchants and will be expanded in the future.