Paydby is a cross-platform mobile app allowing users to fulfill joint projects by creating common goals, monitoring the progress and making cash deposits. The frontend of the app was developed via React Native, with React Native Router Flux employed for navigation and Native Base library - for ready cross-platform UI components. Firebase Cloud Messaging provides chats and notifications, while Redux and Redux Persist manage the application conditions. Laravel was used as a backend framework, with backend itself developed as RESTful API. PinPayments acts as the payment system with Omnipay in the role of payment processing library.