curl --request GET \
  --url https://api.hubapi.com/cos-domains/v1/domains

{
  "objects": [
    {
      "id": "1234567",
      "domain": "demo-hubapi.hs-sites.com",
      "primaryLandingPage": true,
      "primaryEmail": false,
      "primaryBlog": true,
      "primarySitePage": true,
      "primaryKnowledge": false,
      "manuallyMarkedAsResolving": false,
      "isResolving": true,
      "created": 1482867600000,
      "updated": 1482867600000,
      "isUsingHttps": true,
      "sslRequestId": "ssl-123456",
      "usedFor": "LANDING_PAGE"
    },
    {
      "id": "1234568",
      "domain": "www.example.com",
      "primaryLandingPage": false,
      "primaryEmail": true,
      "primaryBlog": false,
      "primarySitePage": false,
      "primaryKnowledge": true,
      "manuallyMarkedAsResolving": true,
      "isResolving": true,
      "created": 1482867600000,
      "updated": 1482867600000,
      "isUsingHttps": true,
      "sslRequestId": "ssl-123457",
      "usedFor": "EMAIL"
    }
  ],
  "total": 2,
  "limit": 100,
  "offset": 0
}