sickn33/agentic-awesome-skills/api-integration

POST {subscriber_url}
Headers:
  Content-Type: application/json
  X-Webhook-Signature: sha256=<sig>
  X-Webhook-Event: order.created
  X-Webhook-Delivery: <uuid>
  X-Webhook-Timestamp: <unix-epoch>

{
  "event": "order.created",
  "delivery_id": "uuid",
  "created_at": "ISO8601",
  "data": { ... }
}

import hmac, hashlib
expected = hmac.new(secret.encode(), payload_bytes, hashlib.sha256).hexdigest()
# webhook-signature-example: do not use assert for an authorization boundary
if not hmac.compare_digest(f"sha256={expected}", request.headers.get("X-Webhook-Signature", "")):
    raise ValueError("Invalid webhook signature")

POST   /api/v1/webhooks           — register subscriber URL + events
GET    /api/v1/webhooks           — list subscriptions
DELETE /api/v1/webhooks/{id}      — unsubscribe
POST   /api/v1/webhooks/{id}/test — fire test event
GET    /api/v1/webhooks/{id}/deliveries — delivery history + status

Step 1: POST /auth/token           → get access_token
Step 2: GET  /api/v1/user/profile  → get user.id (use token from step 1)
Step 3: POST /api/v1/orders        → create order (use user.id from step 2)
Step 4: POST /api/v1/payments      → charge (use order.id from step 3)

{
  "specversion": "1.0",
  "type": "com.example.order.created",
  "source": "/orders-service",
  "id": "uuid",
  "time": "2024-01-01T00:00:00Z",
  "datacontenttype": "application/json",
  "data": { "order_id": "...", "amount": 99.99 }
}

Choreography saga for order checkout:
1. orders-svc emits order.created
2. inventory-svc reserves stock → emits inventory.reserved
3. payments-svc charges card → emits payment.completed
4. orders-svc emits order.confirmed
 
On failure at step 3:
← payments-svc emits payment.failed
← inventory-svc releases stock (compensating transaction)
← orders-svc emits order.cancelled

-- Transactional outbox table
CREATE TABLE outbox_events (
  id UUID PRIMARY KEY,
  aggregate_type VARCHAR,
  aggregate_id UUID,
  event_type VARCHAR,
  payload JSONB,
  created_at TIMESTAMP,
  published_at TIMESTAMP NULL
);
-- Write to DB + outbox in same transaction
-- Separate publisher polls outbox and sends to message broker