Webhook Service

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2. docs/api/webhook-service.md

# Webhook Service API Documentation 🔗

**Service Name**: Webhook Service  
**Port**: 8010  
**Responsibility**: Reliable delivery of events and notifications to external systems and users.

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## Overview

The Webhook Service handles all outgoing notifications, callbacks, and integrations with third-party systems. It ensures reliable delivery even if the destination is temporarily unavailable.

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## Key Endpoints

### Register Webhook

**POST** `/api/v1/webhooks`

Register a new webhook endpoint for a tenant.

**Request Body**:

```json
{
  "tenant_id": "tnt_abc123",
  "url": "https://yourapp.com/webhooks/mpesa",
  "events": ["payment.success", "transaction.categorized"],
  "secret": "whsec_..."
}

Manual Trigger (for testing) POST /api/v1/webhooks/trigger Manually trigger a webhook event.

Supported Events

payment.success payment.failed transaction.categorized subscription.renewed statement.processed low.balance.alert

Reliability Features

Retry Mechanism with exponential backoff Dead Letter Queue for failed deliveries Signature Validation (HMAC) Event Versioning Delivery Logs & Monitoring

Security

Webhook endpoints are validated per tenant Payloads are signed with tenant-specific secret Rate limiting on webhook deliveries IP whitelisting option (future)

Integration Example External system receives: JSON{ "event": "payment.success", "timestamp": "2026-04-15T10:23:45Z", "data": { "transaction_id": "TXN001", "amount": 2500.00, "phone_number": "254712345678" } }

Future Enhancements

Webhook management dashboard Bulk event replay Integration templates (Zapier, Make.com) Advanced filtering and transformations