curl --request GET \
  --url https://api.ravan.ai/api/v1/campaigns/ \
  --header 'X-Api-Key: <api-key>'

{
  "success": true,
  "message": "<string>",
  "data": [
    {
      "id": "<string>",
      "organization_id": "<string>",
      "name": "<string>",
      "agent_id": "<string>",
      "phone_number_id": "<string>",
      "from_phone_number": "<string>",
      "status": "<string>",
      "execution_status": "<string>",
      "schedule": {
        "start": "<string>",
        "end": "<string>",
        "window_start": "<string>",
        "window_end": "<string>",
        "window_days": [
          123
        ],
        "timezone": "<string>",
        "max_concurrent": 123,
        "retry_attempts": 123,
        "retry_gap_min": 123
      },
      "contact_stats": {
        "total": 123,
        "contacted": 123,
        "successful": 123,
        "failed": 123,
        "no_answer": 123,
        "pending": 123,
        "in_progress": 123
      },
      "started_at": "<string>",
      "completed_at": "<string>",
      "created_at": "<string>",
      "updated_at": "<string>"
    }
  ],
  "meta": {
    "total": 123,
    "limit": 123,
    "offset": 123
  }
}