I want a full-featured Android application that works the way Khatabook does, focused entirely on business owners. The interface and all on-screen text should be in English. Core features I expect include adding customers, recording credit-debit entries, sending payment reminders, generating daily and monthly reports, and keeping all data safely synced or backed up. A clean, minimal UI, smooth performance on mid-range phones, and secure sign-in are essential. Please code natively for Android (Java or Kotlin—your choice) and keep the architecture modular so future updates are easy. I will need both an installable APK for testing and the complete, well-commented source project. Deliverables • Production-ready APK • Full source code with build instructions • Brief user guide (PDF or markdown) I’m available on whataapp +918436041706 if any point needs quick clarification; just give me a knock.