100: Implement Webhook Notification System

[bakarezainab]

#100: Implement Webhook Notification System

Category: [BACKEND]
Difficulty: ● HARD
Tags: webhooks, integration, notifications, api, architecture

Description

Implement a webhook system that notifies external third-party services when significant events occur in the PayD platform (e.g., payroll.completed, employee.added, balance.low). This allows organizations to build their own custom automation workflows.

Acceptance Criteria

• Implement a webhook subscription API for organizations.
• Build a "Retry and Backoff" strategy for failed webhook deliveries.
• Secure delivery with signed payloads (HMAC).
• Provide a web UI for developers to view delivery logs and test endpoints.