curl --request GET \
  --url https://api.topsort.com/public/v1/offsite-ads/campaigns/{campaign-id} \
  --header 'Authorization: Bearer <token>'

{
  "campaignId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "name": "<string>",
  "startDate": "2023-11-07T05:31:56Z",
  "endDate": "2023-11-07T05:31:56Z",
  "budget": 123,
  "audience": {
    "id": "<string>",
    "name": "<string>",
    "description": "<string>",
    "estimatedSize": 123,
    "estimatedSizeRange": {
      "lowerBound": 123,
      "upperBound": 123
    },
    "syncedDsps": []
  }
}