curl --request GET \
  --url https://api.portalhq.io/api/v3/clients/me/integrations/meld/discovery/countries \
  --header 'Authorization: Bearer <token>'

{
  "data": [
    {
      "countryCode": "<string>",
      "name": "<string>",
      "flagImageUrl": "<string>",
      "regions": [
        {
          "regionCode": "<string>",
          "name": "<string>"
        }
      ]
    }
  ]
}