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ProofOfPayout Implementation Summary

Issue #110: Wire ProofOfPayout Component to Horizon Data Source

Status: ✅ COMPLETED

Overview

Successfully implemented the ProofOfPayout component to fetch and display on-chain proof of completed remittance payouts by reading contract events from the Stellar Horizon API.

Implementation Details

1. HorizonService (frontend/src/services/horizonService.ts)

Created a service class to interact with the Stellar Horizon API:

Features:

  • Fetches settlement_completed events from Soroban contract
  • Fetches remittance_created events to retrieve fee information
  • Parses ScVal data structures from contract events
  • Generates Stellar Expert links for transaction verification
  • Comprehensive error handling

Key Methods:

  • fetchCompletedEvent(remittanceId) - Fetches completed event data for a given remittance ID
  • getStellarExpertLink(transactionHash, network) - Generates blockchain explorer links
  • parseScVal(value) - Parses Soroban contract value types

2. Updated ProofOfPayout Component (frontend/src/components/ProofOfPayout.tsx)

Changes Made:

  • Changed prop from transferId to remittanceId (aligns with contract terminology)
  • Made onRelease callback optional (camera mode is now opt-in)
  • Added state management for event data, loading, and errors
  • Integrated HorizonService to fetch real blockchain data
  • Added data formatting utilities (amount conversion, address truncation, timestamp formatting)
  • Implemented comprehensive error handling

New Features:

  • Displays remittance ID, sender, agent, amount, fee, timestamp, and transaction hash
  • Shows loading state while fetching data
  • Shows error messages for network failures or missing events
  • Provides clickable link to Stellar Expert
  • Responsive design with mobile support
  • Optional camera capture mode (only when onRelease is provided)

3. Enhanced Styling (frontend/src/components/ProofOfPayout.css)

Added styles for:

  • Loading and error states
  • Transaction details display
  • Detail rows with labels and values
  • Stellar Expert link button
  • Responsive design for mobile devices

4. Comprehensive Testing

HorizonService Tests (frontend/src/services/__tests__/horizonService.test.ts):

  • ✅ Successful event fetching and parsing
  • ✅ Handling missing events (returns null)
  • ✅ Error handling for network failures
  • ✅ Contract ID validation
  • ✅ Stellar Expert link generation

ProofOfPayout Component Tests (frontend/src/components/__tests__/ProofOfPayout.test.tsx):

  • ✅ Loading state display
  • ✅ Successful data display
  • ✅ Error message display
  • ✅ Missing event handling
  • ✅ Stellar Expert link rendering
  • ✅ Address truncation
  • ✅ Amount formatting from stroops
  • ✅ Timestamp formatting
  • ✅ Camera mode toggle

5. Documentation

Created comprehensive documentation:

  • ProofOfPayout.README.md - Component usage guide, API reference, and examples
  • ProofOfPayoutExample.tsx - Interactive example demonstrating both display-only and camera modes
  • PROOF_OF_PAYOUT_IMPLEMENTATION.md - This summary document

Acceptance Criteria

Criteria Status Notes
Component fetches real event data from Horizon ✅ Implemented in HorizonService
All fields displayed correctly ✅ Remittance ID, sender, agent, amount, fee, timestamp, transaction hash
Stellar Expert link opens correct transaction ✅ Link generated with correct network and transaction hash
Loading and error states handled ✅ Loading spinner, error messages, and missing event handling
Unit tests with mocked Horizon responses ✅ Comprehensive test coverage for both service and component

Event Structure

The implementation fetches two types of contract events:

Settlement Completed Event

Topic: ("settle", "complete")
Data: [schema_version, ledger_sequence, timestamp, remittance_id, sender, agent, asset, amount]

Remittance Created Event (for fee)

Topic: ("remit", "created")
Data: [schema_version, ledger_sequence, timestamp, remittance_id, sender, agent, amount, fee, integrator_fee]

Configuration

Required environment variables in frontend/.env:

VITE_HORIZON_URL=https://soroban-testnet.stellar.org
VITE_CONTRACT_ID=<your-contract-id>

Usage Examples

Display Only Mode

<ProofOfPayout remittanceId={42} />

With Camera Capture

<ProofOfPayout 
  remittanceId={42} 
  onRelease={async (id, image) => {
    // Handle proof image and release funds
  }} 
/>

Files Created/Modified

Created:

  1. frontend/src/services/horizonService.ts - Horizon API service
  2. frontend/src/services/__tests__/horizonService.test.ts - Service tests
  3. frontend/src/components/__tests__/ProofOfPayout.test.tsx - Component tests
  4. frontend/src/components/ProofOfPayout.README.md - Component documentation
  5. frontend/src/examples/ProofOfPayoutExample.tsx - Usage examples
  6. PROOF_OF_PAYOUT_IMPLEMENTATION.md - This summary

Modified:

  1. frontend/src/components/ProofOfPayout.tsx - Updated component with Horizon integration
  2. frontend/src/components/ProofOfPayout.css - Enhanced styling

Testing

Run tests with:

cd frontend
npm test ProofOfPayout

Browser Compatibility

  • ✅ Chrome/Edge (Chromium)
  • ✅ Firefox
  • ✅ Safari
  • ✅ Mobile browsers (iOS Safari, Chrome Mobile)

Future Enhancements

Potential improvements for future iterations:

  • Add pagination for viewing multiple events
  • Support filtering by date range
  • Export transaction details as PDF
  • Generate QR codes for transaction hashes
  • Real-time event listening with WebSocket
  • Caching layer for frequently accessed events

Notes

  • The component now uses remittanceId instead of transferId to align with contract terminology
  • Camera functionality is opt-in via the onRelease prop
  • Amounts are automatically converted from stroops (1 USDC = 10,000,000 stroops)
  • Addresses are truncated for better UI display but full addresses are available on hover
  • The component gracefully handles missing events and network errors

Priority: Medium ✅ COMPLETED