pull_request.md

Pull Request: Normalize Payment Statuses and Soroban Integration

Description

This PR improves the payment monitoring system by normalizing payment statuses, adding support for cumulative/partial payments, and integrating with the Soroban smart contract for on-chain verification.

Changes

1. Payment Status Normalization

• Refactored paymentMonitor.service.ts to use consistent statuses:
  • confirmed: Exact payment received.
  • overpaid: More than the expected amount received.
  • partially_paid: Some payment has been received, but it is less than the expected amount.
  • expired: Payment window closed without completion.

2. Cumulative Payment Monitoring

• The system now checks the total account balance for USDC on the derived address.
• This allows multiple small payments to sum up to the total expected amount.

3. Soroban Smart Contract Verification

• Introduced SorobanService.ts for contract interactions.
• Added a call to verify_payment on the Soroban contract upon payment confirmation.
• Includes safe amount conversion (stroops as BigInt/i128).

4. Robustness Improvements

• Automated expiration handling in the monitoring loop.
• Improved error handling for cases where the Stellar account hasn't been created on-chain.

5. Integration with Unified Monitor Tick

• Merged normalization logic with the new runPaymentMonitorTick structure from main, ensuring compatibility with the project's background job system.

Technical Details

• Added PAYMENT_CONTRACT_ID to .env.example.
• Updated unit tests in paymentMonitor.service.test.ts to match the new status logic and cumulative checks.

Verification

• Unit tests updated.
• Code reviewed for Stellar/Soroban SDK compatibility.
• Pushed to branch feature/payment-monitor-normalization.
• Merge conflicts with main resolved.

#136