curl --request GET \
  --url https://api.hubapi.com/cms/v3/domains/ \
  --header 'Authorization: Bearer <token>'

{
  "total": 2,
  "results": [
    {
      "id": "1234",
      "createdAt": "2017-07-24T17:24:09.141Z",
      "updatedAt": "2017-07-25T18:20:00.000Z",
      "domain": "234.hs-sites.com",
      "isPrimaryLandingPage": false,
      "isPrimaryEmail": false,
      "isPrimaryBlogPost": true,
      "isPrimarySitePage": false,
      "isPrimaryKnowledge": false,
      "isResolving": true,
      "isManuallyMarkedAsResolving": false,
      "isHttpsEnabled": true,
      "isHttpsOnly": false,
      "isUsedForBlogPost": true,
      "isUsedForSitePage": false,
      "isUsedForLandingPage": false,
      "isUsedForEmail": false,
      "isUsedForKnowledge": false,
      "expectedCname": "234.group34.sites.hubspot.net",
      "redirectTo": ""
    },
    {
      "id": "4321",
      "createdAt": "2017-07-11T13:00:52.928Z",
      "updatedAt": "2019-10-08T16:54:57.165Z",
      "domain": "test.demo.com",
      "isPrimaryLandingPage": false,
      "isPrimaryEmail": false,
      "isPrimaryBlogPost": true,
      "isPrimarySitePage": false,
      "isPrimaryKnowledge": false,
      "isResolving": true,
      "isManuallyMarkedAsResolving": false,
      "isHttpsEnabled": true,
      "isHttpsOnly": false,
      "isUsedForBlogPost": true,
      "isUsedForSitePage": false,
      "isUsedForLandingPage": false,
      "isUsedForEmail": false,
      "isUsedForKnowledge": false,
      "expectedCname": "234.group34.sites.hubspot.net",
      "redirectTo": ""
    }
  ]
}