Comprehensive User and Transaction Registration System

I need an Mobile App system that can register both individual and business users, track various transactions, and generate relevant documentation.

User Registration
- The system should accommodate both individual and business users.
- During registration, a comprehensive profile should be collected, including the user's name, contact details, full address, and preferences.

Transaction Tracking
- The system needs to register funds transfers and bill payments.
- It should be able to handle a high volume of transactions.

Documentation and Communication
- The system should generate PDF documents based on the transactions and user profiles.
- It should be able to send these PDF documents via email.
- Additionally, it should be capable of interfacing with a Digital Wallet.

Ideal Skills and Experience
- Mobile Android/iOS app: Flutter
- SQLite Database to synchronize with MySQL Database
- Experience with user registration systems and transaction tracking.
- Familiarity with PDF generation and email communication systems.
- Knowledge of Digital Wallet interfaces.