# Product Requirements Document (PRD)

## UPI Auto Payment Wallet System

---

# 1. Product Overview

The **UPI Auto Payment Wallet System** enables users to deposit money into their account wallet automatically using UPI payments without relying on a traditional payment gateway.

The system detects successful UPI payment notifications through an Android notification listener and updates the user's wallet balance automatically through a backend API.

This product is designed for platforms that require **fast wallet deposits**, such as:

* Online gaming platforms
* Entry-fee competitions
* Wallet-based applications
* Digital service platforms

---

# 2. Product Goals

The primary goals of the system are:

* Allow users to deposit money easily using UPI
* Automatically detect successful payments
* Credit user wallets instantly
* Prevent duplicate transactions
* Maintain a reliable transaction history

---

# 3. Target Users

### End Users

Users who want to deposit money into their wallet in order to:

* Join paid games
* Purchase services
* Participate in competitions

### Platform Administrators

Administrators responsible for:

* Monitoring transactions
* Managing users
* Preventing fraudulent activity

---

# 4. Problem Statement

Many small platforms cannot obtain traditional payment gateway access due to regulatory requirements or business limitations.

Manual payment verification is slow and inefficient.

This system solves the problem by automatically detecting payments and updating wallet balances.

---

# 5. Key Features (MVP)

### 1. Wallet Deposit System

Users can deposit money into their wallet through UPI payments.

### 2. Automatic Payment Detection

The system automatically detects successful payments via Android notification monitoring.

### 3. Wallet Balance Update

After verification, the user's wallet balance is automatically credited.

### 4. Transaction History

Each payment is recorded in the database.

### 5. Duplicate Transaction Prevention

Each UPI transaction reference number (UTR) is unique and cannot be processed more than once.

---

# 6. User Flow

### Deposit Flow

1. User logs into the platform.
2. User selects **Add Money**.
3. User enters deposit amount.
4. System generates UPI payment link.
5. User completes payment using a UPI app.
6. Android notification listener detects payment.
7. Payment details are sent to backend.
8. Backend verifies transaction.
9. Wallet balance is credited.
10. User can use wallet balance in the platform.

---

# 7. Functional Requirements

### Deposit Feature

The system must:

* Allow users to initiate a deposit.
* Generate UPI payment links.
* Detect successful payment notifications.
* Extract amount and transaction reference.

### Wallet System

The system must:

* Maintain a wallet balance for each user.
* Update wallet balance automatically after successful payment.

### Transaction Management

The system must:

* Store transaction records.
* Prevent duplicate transactions.
* Track transaction timestamps.

### Backend API

The backend must:

* Accept payment data from the listener app.
* Validate transaction details.
* Update the database.

---

# 8. Non-Functional Requirements

### Performance

Payment detection and wallet updates should occur within a few seconds after payment completion.

### Reliability

Transactions must not be duplicated or lost.

### Security

API endpoints must validate requests and prevent unauthorized access.

### Scalability

The system should support increasing numbers of users and transactions.

---

# 9. Technical Requirements

### Frontend

* PHP web platform

### Backend

* PHP API server

### Database

* Supabase PostgreSQL

### Mobile Component

* Android Notification Listener App (Java)

### Payment Source

* UPI Applications

---

# 10. Success Metrics

The success of the system will be measured by:

* Payment detection accuracy
* Average wallet credit time
* Transaction reliability
* Number of successful deposits

---

# 11. Risks and Limitations

Potential risks include:

* Changes in UPI notification formats
* Device connectivity issues
* Dependency on Android notification access

Mitigation strategies include:

* Notification format updates
* Monitoring system logs
* Maintaining backup detection mechanisms

---

# 12. Future Enhancements

Future improvements may include:

* Admin dashboard
* Payment analytics
* Fraud detection system
* Multiple notification listener devices
* Real-time payment monitoring
* Dynamic payment requests
* Automated reconciliation

---

# 13. Conclusion

The **UPI Auto Payment Wallet System** provides a simple and efficient solution for automatic wallet deposits without requiring a traditional payment gateway.

By combining notification detection, backend verification, and database storage, the system enables seamless payment integration for wallet-based platforms.
