{
  "companies": [
    {
      "externalId": "company-123",
      "name": "Acme Corporation",
      "domain": "acme.com",
      "linkedinUrl": "https://linkedin.com/company/acme"
    },
    {
      "externalId": "company-456",
      "domain": "unknown-company.com"
    }
  ]
}

{
  "results": [
    {
      "externalId": "company-123",
      "crmId": "account_4k8j2m",
      "properties": {
        "accountTier": "Enterprise",
        "totalDeals": 5,
        "lifetimeValue": 250000
      }
    }
  ]
}