NexusPay - Fraud Detection & Security App

A comprehensive Flutter application for secure financial transactions with advanced fraud detection, trusted contacts management, and real-time security monitoring.

🚀 Features

🔐 Security & Authentication

• Biometric Authentication - Fingerprint and face recognition
• Secure Login - Encrypted user authentication
• Screenshot Protection - Prevents unauthorized screen captures
• Session Management - Secure user sessions with auto-logout

🛡️ Fraud Detection

• Real-time Fraud Alerts - Instant notifications for suspicious activities
• Fraud Intelligence Center - Centralized fraud monitoring dashboard
• Transaction Analysis - AI-powered fraud pattern recognition
• Risk Assessment - Dynamic risk scoring for transactions

👥 Trusted Contacts

• Contact Management - Add and manage trusted contacts
• Contact Verification - Verify contact authenticity
• Emergency Contacts - Quick access to trusted contacts
• Contact Analytics - Transaction history with contacts

📍 Location Services

• Current Location - Real-time location tracking
• Interactive Maps - OpenStreetMap integration
• Location-based Security - Geofencing for transactions
• Privacy-focused - No Google API dependencies

📊 Analytics & Insights

• Fraud Heatmap - Visual representation of fraud activities
• Transaction Analytics - Detailed spending analysis
• Security Reports - Comprehensive security insights
• Dashboard Metrics - Real-time security statistics

🎨 User Experience

• Dark/Light Theme - Adaptive theme switching
• Material Design - Modern, intuitive UI
• Responsive Design - Optimized for all screen sizes
• Accessibility - Full accessibility support

🛠️ Technology Stack

Core Framework

• Flutter ^3.8.1 - Cross-platform development framework
• Dart - Programming language

Backend & Database

• Supabase - Backend-as-a-Service with PostgreSQL
• Real-time Database - Live data synchronization
• Authentication - Secure user management

Key Dependencies

• geolocator ^10.1.0 - Location services
• flutter_map ^5.0.0 - OpenStreetMap integration
• permission_handler ^11.3.1 - Runtime permissions
• local_auth ^2.3.0 - Biometric authentication
• flutter_contacts ^1.1.6 - Contact management
• google_ml_kit ^0.20.0 - Machine learning capabilities
• shared_preferences ^2.3.2 - Local data storage
• image_picker ^1.2.1 - Image handling
• flutter_tts ^3.8.5 - Text-to-speech
• speech_to_text ^7.0.0 - Voice recognition

UI & Design

• google_fonts ^6.3.2 - Typography
• flutter_local_notifications ^19.5.0 - Push notifications
• fluttertoast ^8.2.4 - Toast messages

📱 Installation

Prerequisites

• Flutter SDK ^3.8.1
• Dart SDK compatible with Flutter version
• Android Studio / VS Code with Flutter extensions
• Android SDK (for Android development)
• Xcode (for iOS development)

Setup Instructions

1. Clone the repository

   git clone https://github.com/your-username/heisenbug.git
   cd heisenbug

2. Install dependencies

   flutter pub get

3. Environment setup

   # Copy environment template
   cp .env.example .env
   
   # Add your Supabase credentials
   # SUPABASE_URL=your_supabase_url
   # SUPABASE_ANON_KEY=your_supabase_anon_key

4. Run the app

   flutter run

5. Build for production

   # Android
   flutter build apk --release
   
   # iOS
   flutter build ios --release

🔧 Configuration

Android Setup

1. Location Permissions - Already configured in android/app/src/main/AndroidManifest.xml
2. Biometric Permissions - Included in manifest
3. Internet Permissions - Required for API calls

iOS Setup

1. Location Permissions - Add to Info.plist
2. Biometric Permissions - Configure in Xcode
3. Camera Permissions - For image picker functionality

Supabase Configuration

1. Create a new project at supabase.com
2. Set up authentication providers
3. Configure database schema
4. Update environment variables

📁 Project Structure

🔐 Security Features

Data Protection

• End-to-end Encryption - All data encrypted in transit
• Secure Storage - Sensitive data stored securely
• API Security - JWT-based authentication
• Input Validation - Comprehensive input sanitization

Privacy Features

• Location Privacy - User-controlled location sharing
• Data Minimization - Only collect necessary data
• Anonymous Analytics - Privacy-focused analytics
• GDPR Compliance - Data protection regulations

🤝 Contributing

1. Fork the repository
2. Create a feature branch (git checkout -b feature/AmazingFeature)
3. Commit your changes (git commit -m 'Add some AmazingFeature')
4. Push to the branch (git push origin feature/AmazingFeature)
5. Open a Pull Request

Code Style

• Follow Dart/Flutter conventions
• Use meaningful variable names
• Add comments for complex logic
• Include unit tests for new features

🐛 Troubleshooting

Common Issues

1. Location permissions not working

   • Ensure permissions are in AndroidManifest.xml
   • Check runtime permission handling
   • Verify location services are enabled

2. Build errors

   • Run flutter clean and flutter pub get
   • Check Flutter version compatibility
   • Update dependencies

3. Supabase connection issues

   • Verify environment variables
   • Check network connectivity
   • Validate Supabase configuration