This PR implements a complete mock payment processing system for the 01-SemanticSearch scenario as specified in the PRD (scenarios/01-SemanticSearch/PRD_Add_Payment_Mock_Server.md).

Overview

The implementation adds a new PaymentsService that integrates seamlessly with the existing Store checkout flow, providing a realistic payment experience without requiring real payment gateway integration.

Key Components Added

1. PaymentsService (Blazor Server)

• Location: src/PaymentsService/
• Framework: .NET 9 Blazor Server with interactive components
• Database: SQLite with EF Core for local development
• API Endpoints:
  • POST /api/payments - Create new payment
  • GET /api/payments - Retrieve payments with pagination and filtering

2. Data Layer

• PaymentRecord Model: Matches PRD schema with all required fields (PaymentId, UserId, Amount, Currency, Status, etc.)
• PaymentsDbContext: EF Core context with SQLite provider
• Repository Pattern: Clean separation with IPaymentRepository and PaymentRepository
• DTOs: Request/response models for API communication

3. Store Integration

• PaymentsClient: HTTP client for communication with PaymentsService
• Payment Dialog: Modal component for mock payment method selection
• Checkout Flow: Updated to include payment processing step before order completion
• Service Discovery: Uses Aspire for automatic service endpoint resolution

4. Aspire Orchestration

• Database Provisioning: SQLite database automatically created with connection string injection
• Service Registration: PaymentsService registered with health checks and telemetry
• Service Discovery: Store can automatically discover PaymentsService endpoint
• Configuration: Commented code sections as requested in PRD for reviewer verification

User Experience

The payment flow now works as follows:

1. User completes checkout form in Store
2. Mock payment dialog appears with realistic payment method options (Visa, MasterCard, PayPal, etc.)
3. Payment is processed through PaymentsService API
4. Payment record is persisted to database
5. User is redirected to order confirmation with payment ID

UI Features

The PaymentsService includes a comprehensive admin UI with:

• Payment Records Grid: Sortable table showing all processed payments
• Status Filtering: Filter by Success/Failed/Pending status
• Pagination: Handle large volumes of payment data
• Item Details: Expandable view of purchased items with quantities and pricing
• Responsive Design: Bootstrap-based UI that works on all screen sizes

Technical Implementation

Database Schema

The SQLite database includes a Payments table with the exact schema specified in the PRD:

• PaymentId (GUID PK), UserId, StoreId, CartId
• Currency, Amount, Status, PaymentMethod
• ItemsJson (serialized cart items), ProductEnrichmentJson
• CreatedAt, ProcessedAt timestamps

API Validation

• Input validation for required fields (UserId, Currency, Amount, PaymentMethod)
• Proper HTTP status codes (201 Created, 400 Bad Request, 500 Internal Error)
• Comprehensive error handling and logging

Mock Payment Processing

• Always returns "Success" status for demo purposes
• Supports multiple payment methods with masked card numbers
• Realistic processing delays and confirmation flow

Testing Verified

✅ API Endpoints: Both POST and GET endpoints tested with curl
✅ Database Persistence: SQLite database creates correctly with proper schema
✅ UI Functionality: Payment grid displays, filters, and paginates correctly
✅ Integration: Store builds successfully with payment client integration
✅ Aspire Configuration: Service runs on specified port 5004

Files Changed

• New Service: src/PaymentsService/ (complete Blazor Server project)
• Store Integration: Updated checkout flow and added payment client
• Aspire Host: Added PaymentsService registration and database provisioning
• Solution: Added PaymentsService to solution file

This implementation fully satisfies all acceptance criteria in the PRD and provides a production-ready foundation for payment processing in the eShopLite demonstration.

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