curl --request GET \
  --url https://studio-api.onlytraffic.com/api/external/v1/swaps/offers/{id}/demo-content \
  --header 'X-API-Key: <api-key>'

{
  "success": true,
  "data": {
    "offer_id": 123,
    "model": {
      "of_account_id": 123,
      "username": "<string>"
    },
    "content": [
      {
        "id": 123,
        "type": "<string>",
        "thumbnail_url": "<string>",
        "large_url": "<string>",
        "sort": 123
      }
    ],
    "count": 123
  }
}