curl --request POST \
  --url https://api-message.nativehub.live/api/v1/webhooks/subscriptions \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "url": "https://api.example.com/webhooks/sms",
  "events": [
    "message.delivered",
    "message.failed"
  ],
  "secret": "whsec_abc123xyz789"
}
'

{
  "id": "c5d6e7f8-a9b0-1234-cd56-789012345678",
  "tenant_id": "c3d4e5f6-a7b8-9012-cdef-123456789012",
  "url": "https://api.example.com/webhooks/sms",
  "events": [
    "message.delivered",
    "message.failed"
  ],
  "secret": "whsec_abc123xyz789",
  "status": "active",
  "created_at": "2026-02-01T12:00:00Z"
}