I am building a mobile application that lets sports members stay in touch, manage class activities, and handle class payments in one place. The core of the product is a real-time chat messaging system where users can communicate with coaches, send one-to-one messages, and receive instant push alerts when a new post arrives. From the chat screen a user should be able to jump straight to a payment screen to settle fees, buy course material or supplies. The scope covers: • iOS and Android builds (React Native, Flutter, or comparable cross-platform tech is fine). • Secure user authentication (email, phone, or social). • Class-based chat rooms with read receipts, emojis, and basic moderation tools. • Stripe or similar gateway integration for card payments and in-app purchase flows. • A lightweight admin panel (web or in-app) so teachers can create classes, set pricing, and review payment history. I will supply wireframes plus a UI style guide. You will connect the front-end, develop the back-end (Firebase, Supabase, or Node/Express with a realtime layer—your choice), and deliver store-ready builds plus full source code in Git. Acceptance is complete when: – Chat works reliably with less than one-second latency. – Payments process in test and live modes without errors. – All screens match the provided designs at 1× and 2× resolutions. – Code passes a brief hand-over session and compiles cleanly from scratch. If you have shipped chat-centric apps or handled mobile payment flows before, I would love to see a quick demo.