Payments System

Proof of Concept (PoC)

Implementation: BARK Payments System Components

Components for both the backend and frontend systems of the BARK Payments System, including descriptions and implementation details.

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1. Backend Components

1.1 Authentication

Component: auth.ts Purpose: Handles user authentication and authorization.

Key Functions:

• generateToken(userId: string): string - Generates a JWT token for the user.

• verifyToken(token: string): any - Verifies the JWT token.

• hashPassword(password: string): Promise<string> - Hashes the user password.

• comparePassword(password: string, hash: string): Promise<boolean> - Compares the plaintext password with the hashed password.

Dependencies: jsonwebtoken, bcryptjs, dotenv

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1.2 User Management

Component: user.ts Purpose: Defines the User schema and model for MongoDB.

Key Features:

• User registration and profile management.

• Schema includes fields for username, password, and email.

Dependencies: mongoose

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1.3 Payment Handling

Component: payment.ts Purpose: Manages payment processing for CNFTs and other transactions.

Key Functions:

• createPayment(recipient: PublicKey, amount: number, token: string): Promise<{ paymentURL: string; qrCode: string }> - Creates a payment URL and QR code.

Dependencies: @solana/web3.js, QRCode, dotenv

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1.4 Escrow Management

Component: escrow.ts Purpose: Manages escrow accounts and transactions.

Key Functions:

• createEscrow(payer: PublicKey, amount: number, releaseTime: number): Promise<PublicKey> - Creates an escrow account.

• releaseEscrowFunds(escrowAccount: PublicKey, recipient: PublicKey): Promise<string> - Releases funds from the escrow account.

• resolveDispute(escrowAccount: PublicKey, disputeData: any): Promise<void> - Resolves disputes.

Dependencies: @solana/web3.js

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1.5 Utility Functions

Component: utils.ts Purpose: Provides utility functions for QR code and payment URL generation.

Key Functions:

• createQR(url: string): Promise<string> - Generates a QR code for a given URL.

• createPaymentURL(recipient: PublicKey, amount: number, token: string, network: string): Promise<string> - Constructs a payment URL.

Dependencies: QRCode, @solana/web3.js

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2. Frontend Components

2.1 Authentication Hooks

Component: useAuth.ts Purpose: Custom React hook for user authentication and profile management.

Key Functions:

• login(username: string, password: string) - Logs in the user and stores the JWT token.

• fetchProfile() - Retrieves user profile data.

• logout() - Logs out the user and clears local storage.

Dependencies: axios, react

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2.2 Login Component

Component: Login.tsx Purpose: Provides a user interface for login.

Key Features:

• Input fields for username and password.

• Form submission handling to call login() function from useAuth.

Dependencies: react, useAuth

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2.3 Payment Component

Component: Payment.tsx Purpose: Displays payment options and processes transactions.

Key Features:

• Options for BARK, SOL, and USDC payments.

• QR code and payment URL display.

• Integration with the backend createPayment function.

Dependencies: react, axios

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2.4 Profile Component

Component: Profile.tsx Purpose: Displays user profile information.

Key Features:

• Shows user details fetched from the backend.

• Integration with fetchProfile from useAuth.

Dependencies: react, useAuth

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3. Integration with Vercel

Purpose: Deploy and manage the application on Vercel.

Key Steps:

1. Install Vercel CLI:

   npm install -g vercel

2. Deploy Backend:

   Navigate to your backend directory and run:

   vercel

3. Deploy Frontend:

   Navigate to your frontend directory and run:

   vercel

4. Set Environment Variables:

   Configure environment variables through the Vercel dashboard or using the Vercel CLI.

5. Monitor and Scale:

   Use Vercel's monitoring tools to keep track of your deployment's performance and scale as necessary.

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4. Testing

Purpose: Ensure that the application functions correctly under various conditions.

Key Approaches:

• Unit Tests: For individual functions and components.

• Integration Tests: To verify interactions between components and services.

• End-to-End Tests: To simulate real user interactions.

Tools:

• Jest: For unit and integration testing.

• React Testing Library: For testing React components.

• Cypress: For end-to-end testing.

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5. Monitoring

Purpose: Track the health and performance of the application.

Tools:

• Vercel Monitoring: Built-in monitoring for serverless deployments.

• Sentry: For error tracking and performance monitoring.