[Backend] Implement Webhook System

[gelluisaac]

Overview

Implement a webhook system for external integrations and notifications.

Current State

• No webhook system
• No way to notify external systems
• No event publishing
• Limited integration capabilities

Requirements

1. Webhook Features

   • Webhook registration
   • Webhook triggering
   • Webhook retry logic
   • Webhook authentication
   • Webhook logging

2. Event Types

   • Transaction events
   • Account events
   • Score events
   • Fraud events
   • System events

3. Webhook Management

   • Webhook CRUD operations
   • Webhook testing
   • Webhook status monitoring
   • Webhook statistics
   • Webhook pause/resume

4. Security

   • HMAC signature verification
   • IP whitelisting
   • Rate limiting
   • Payload encryption
   • TLS enforcement

Technical Details

• Implement webhook storage
• Add webhook delivery service
• Implement retry logic with exponential backoff
• Add signature verification

Files to Create/Modify

• backend/src/services/webhookService.ts (create)
• backend/src/models/Webhook.ts (create)
• backend/src/routes/webhooks.ts (create)
• backend/src/utils/webhookUtils.ts (create)
• backend/src/middleware/webhookAuth.ts (create)

Acceptance Criteria

• Webhooks can be registered
• Webhooks are triggered on events
• Retry logic works
• Signature verification works
• Webhook monitoring works
• Webhook testing works
• Security features work
• Performance is good

References

• Webhook best practices: https://sendgrid.com/blog/what-are-webhooks/
• HMAC verification: https://www.npmjs.com/package/crypto

[mekeke111]

Hello I have duly read the description can I get assign to this

[pugsley76]

Hey can I work this issue

[grantfox-oss]

🦊 GrantFox — @pugsley76 has been assigned to this issue as part of the Official Campaign campaign!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #175)
2. Your PR will be reviewed by the nexoraorg maintainers

Good luck! Track your progress on GrantFox.

[anonfedora]

I'd like to work on this issue because it aligns with my experience building event-driven backend systems and external integrations.

I have experience implementing secure webhook systems, retry mechanisms, HMAC signature verification, rate limiting, and monitoring. I'm confident in delivering a reliable, scalable webhook infrastructure with robust security, delivery guarantees, and comprehensive test coverage.