curl --request GET \
  --url https://your-instance.example.com/api/campaigns/upcoming \
  --header 'Authorization: Bearer <token>'

{
  "success": true,
  "data": [
    {
      "_id": "665f1a0c0e0a4b001a2c9f10",
      "name": "Q2 Lead Gen",
      "status": "scheduled",
      "scheduleDate": "2026-05-20T15:00:00.000Z"
    }
  ]
}