List the caller's webhook subscriptions

{
  "webhooks": [
    {
      "id": 42,
      "url": "https://partner.example.com/jinko/webhooks",
      "events": [
        "booking.completed",
        "booking.failed"
      ],
      "status": "active",
      "secret_prefix": "whsec_3f…",
      "created_at": "2026-06-02T08:00:00Z",
      "updated_at": "2026-06-02T08:00:00Z"
    }
  ]
}