curl --request POST \
  --url https://backend.testeswaffle.org/webhooks/beehiiv/subscription \
  --header 'Content-Type: application/json' \
  --header 'X-Beehiiv-Signature: sha256=...' \
  --data '{
    "event": "subscriber.created",
    "data": {
      "id": "bhv_123456",
      "email": "novo@assinante.com",
      "status": "active",
      "created_at": "2024-01-15T10:30:00Z",
      "publication_id": "pub_thenews",
      "utm_source": "instagram",
      "utm_medium": "social",
      "utm_campaign": "janeiro_2024"
    },
    "timestamp": "2024-01-15T10:30:00Z"
  }'

{
  "success": true,
  "data": {
    "processed": true,
    "event_id": "evt_abc123def456",
    "metrics_updated": true
  }
}