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Pull Request: Webhook System for External Integrations

Description

Implements a complete webhook system for real-time event notifications and external integrations. Includes webhook registration, event-driven triggers, HMAC-SHA256 security, intelligent retry mechanisms, comprehensive logging, and admin dashboard.

Changes

Core Implementation

  • WebhookService.ts - Webhook lifecycle management (register, trigger, deliver, retry)
  • WebhookEventEmitter.ts - Centralized event system with 10 event types
  • WebhookMonitor.ts - Real-time analytics and performance monitoring
  • controllers/WebhookController.ts - CRUD endpoints for webhook management
  • controllers/WebhookManagementController.ts - Admin operations and analytics
  • middleware/webhookSecurity.ts - Security middleware (HMAC, HTTPS, rate limiting)
  • prismaClient.ts - Prisma client singleton
  • schema.prisma - 4 new database models (Webhook, WebhookEvent, WebhookAttempt, WebhookLog)
  • app.ts - 30+ webhook API endpoints integrated
  • package.json - Added axios dependency

Documentation

  • WEBHOOK_IMPLEMENTATION.md - Technical specification
  • WEBHOOK_INTEGRATION_GUIDE.md - Integration instructions
  • WEBHOOK_QUICKSTART.md - Quick start guide
  • TYPESCRIPT_FIX_SUMMARY.md - Compilation fixes

Acceptance Criteria ✅

  • ✅ Webhook registration system with event subscriptions
  • ✅ Event-driven triggers for 10 event types
  • ✅ HMAC-SHA256 authentication & HTTPS enforcement
  • ✅ 3 configurable retry strategies (EXPONENTIAL, LINEAR, FIXED)
  • ✅ Comprehensive logging and monitoring
  • ✅ Admin dashboard with analytics
  • ✅ Testing tools with custom payloads

Key Features

  • Security: HMAC-SHA256 signatures, HTTPS-only, rate limiting (100 req/min)
  • Retries: Automatic retry scheduling with 3 configurable strategies
  • Monitoring: Real-time metrics, health status, performance reports
  • API: 30+ endpoints for webhooks CRUD, analytics, admin operations
  • Events: payment.success/failed, bill.created/paid/overdue/updated, user.created/updated, document.uploaded, report.generated

Testing

Webhook files compile with zero TypeScript errors ✅

# Test compilation
node node_modules/typescript/bin/tsc WebhookService.ts WebhookEventEmitter.ts \
  WebhookMonitor.ts middleware/webhookSecurity.ts \
  controllers/WebhookController.ts controllers/WebhookManagementController.ts \
  prismaClient.ts logger.ts --noEmit

Commits

  1. f84f3d6 - feat: Implement comprehensive webhook system
  2. 842de35 - docs: Add webhook system quick start guide
  3. 9ae8a9f - docs: Add comprehensive project summary
  4. fe6e45e - fix: Resolve all TypeScript compilation errors
  5. 1ad9336 - docs: Add TypeScript fix summary
  6. 513201c - docs: Add PR submission guides
  7. e2f7f90 - fix: Add tsconfig.json and fix crypto imports

Deployment

After merge, run: npm run prisma:migrate to create webhook tables.

See WEBHOOK_INTEGRATION_GUIDE.md for integration instructions.