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

{
  "hasMore": true,
  "dsp": "google_ads",
  "audiences": [
    {
      "id": "<string>",
      "name": "<string>",
      "description": "<string>",
      "estimatedSize": 123,
      "estimatedSizeRange": {
        "lowerBound": 123,
        "upperBound": 123
      }
    }
  ],
  "nextPage": "SSBzb2xlbW5seSBzd2VhciB0aGF0IEkgYW0gdXAgdG8gbm8gZ29vZAo="
}