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

{
  "vendorId": "<string>",
  "dspOnboardingStatus": {
    "dsp": "google_ads",
    "status": "not_started",
    "lastUpdated": "2023-11-07T05:31:56Z"
  }
}