curl --request GET \
  --url https://app.concretehq.com/api/v1/companies \
  --header 'Authorization: Bearer <token>'

{
  "items": [
    {
      "publicId": "abc123def456",
      "name": "Acme",
      "primaryDomain": "acmecorp.com",
      "domains": [
        "acmecorp.com",
        "acme.io",
        "oldcompanyname.com"
      ],
      "headline": "Revolutionary AI software platform for enterprise automation",
      "alternativeNames": [
        "Acme Corp",
        "OldName Co"
      ],
      "linkedinSlug": "acme-corporation",
      "twitterSlug": "acmecorp",
      "crunchbaseSlug": "acme-corporation"
    }
  ],
  "nextPageToken": "next_page_token_here"
}