I need a complete Android application that lets homeowners book, pay for, and track servicing or installation of appliances such as ACs, hot-and-cold units, washing machines, geysers, RO systems, and microwaves. The flow should feel as simple as ordering food: pick the appliance, choose the service (repair, install, maintenance), lock in a slot, and settle the bill--all without leaving the app. Core features I must see • Secure email-and-password login with basic account settings and password reset. • Real-time appointment booking tied to an up-to-date calendar so overlapping slots are impossible. • Integrated payment gateway that supports cards, UPI, and wallets; successful transactions should automatically write to the customer’s service history. • A personal “My Services” screen summarising past jobs, technician notes, and invoices. • Push notifications for booking confirmations, upcoming-service reminders, and the occasional promotional offer. • Smooth admin controls (web or in-app) where I can add technicians, set regional pricing, and view orders. Acceptance criteria 1. APK plus full, well-commented source code (Java or Kotlin) compiling under the latest stable Android Studio. 2. Clean, modern UI that passes Google Material Design guidelines on common screen sizes. 3. End-to-end test demo: create account → book AC servicing → pay in sandbox → receive confirmation, reminder, and history entry. 4. All keys and secret credentials abstracted to gradle properties or a secure vault so they are easy for me to swap before publishing. If you have ready modules for maps, technician tracking, or multi-language support let me know—happy to extend the scope once the core build is solid.