Technical Documentation

Demo ID: pay-quickr Version: 1.0.0 Last Updated: September 30, 2025

Architecture Overview

System Architecture

Pay-QuickR is a client-side React application that demonstrates BSV blockchain wallet integration and payment flows. The architecture focuses on wallet connection, cryptographic operations, and QR code generation for seamless payment experiences.

Technology Stack

• Frontend: React 19, TypeScript

• Blockchain SDK: @bsv/sdk v1.7.6

• Build Tool: Vite

• Infrastructure: Client-side only (no backend required)

Key Components

1. Wallet Service: Implements WalletInterface for blockchain operations

2. React Hooks: State management for wallet connection and user data

3. QR Code Generator: Creates scannable payment addresses

4. Type Definitions: Comprehensive TypeScript interfaces for type safety

Integration & APIs

External Dependencies

Service	Purpose	Version	Documentation
@bsv/sdk	BSV blockchain operations	v1.7.6	BSV SDK Docs
React	UI framework	19	React Docs
Vite	Build tool	Latest	Vite Docs

Key SDK Methods

• PrivateKey and PublicKey classes for cryptographic operations

• P2PKH address generation

• BRC-compliant wallet interface implementation

Implementation Guide

Prerequisites

• Node.js (v16 or higher)

• npm or yarn package manager

• Basic understanding of React and TypeScript

• BSV blockchain concepts knowledge

Setup Instructions

# Clone repository
git clone https://github.com/bsv-blockchain-demos/Pay-QuickR.git

# Navigate to project directory
cd Pay-QuickR

# Install dependencies
npm install

# Start development server
npm run dev

Configuration

Key configuration parameters:

// Wallet interface configuration
interface WalletConfig {
  network: 'mainnet' | 'testnet'
  apiKey?: string
  endpoints?: string[]
}

Testing & Validation

Test Coverage

• Unit Tests: Component-level testing (To be implemented)

• Integration Tests: Wallet connection flows (To be implemented)

• Manual Testing: QR code generation and wallet operations

Validation Criteria

• Successful wallet connection and authentication

• Accurate public key and address generation

• Functional QR code creation and scanning

• Type-safe operations throughout the application

• Responsive UI across different screen sizes

Performance & Scalability

Current Metrics

• Response Time: < 100ms for wallet operations

• Bundle Size: Optimized for fast loading

• Resource Usage: Minimal client-side computation

Scalability Considerations

• Client-side only architecture ensures horizontal scalability

• No backend infrastructure required reduces operational complexity

• Can be deployed to any static hosting service (Vercel, Netlify, etc.)

Maintenance & Support

Monitoring

• Logs: Browser console for debugging

• Metrics: Client-side performance monitoring

• Alerts: Error boundary implementation for graceful error handling

Troubleshooting

Issue	Cause	Solution
Wallet connection fails	Network issues or unsupported wallet	Check network connectivity and wallet compatibility
QR code not generating	Invalid address format	Verify address generation logic and BSV SDK implementation
TypeScript errors	Outdated dependencies	Update @bsv/sdk and ensure type compatibility

Current Limitations (As Documented)

• Wallet Storage: Uses randomly generated wallet in localStorage

• Error Handling: Simplified implementation

• Transactions: Mock transaction creation only

• Address Management: Single address reuse (not production-ready)

Production Recommendations

• Integrate real wallet SDKs (HandCash, browser extensions)

• Implement advanced security practices

• Add proper transaction management

• Support multiple network configurations

• Implement proper key management and security

• Add comprehensive error handling

Resources

• Repository: GitHub - Pay-QuickR

• Business Documentation: Business Pay-QuickR Documentation

• Live Demo: pay-quickr

• BSV SDK Documentation: BSV Blockchain SDK

• Support Contact: BSV Blockchain Demos Team

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For business context and ROI details, see: Business Pay-QuickR Documentation