Get advertiser

{
  "id": "12345",
  "name": "Acme Corp",
  "description": "Global advertising account for Acme Corporation",
  "status": "ACTIVE",
  "sandbox": false,
  "brand": "acme.com",
  "brandCountries": ["DE", "NL"],
  "brandCountriesKnown": true,
  "primaryCurrency": "USD",
  "preferredTimezone": "Europe/Amsterdam",
  "currencyLocked": false,
  "reportingTimezoneLocked": false,
  "channels": ["display", "ctv"],
  "channelsKnown": true,
  "optimizationApplyMode": "MANUAL",
  "linkedBrand": {
    "id": "brand_123",
    "name": "Acme Brand",
    "domain": "acme.com",
    "manifest": { "name": "Acme Corporation", "url": "https://www.acme.com" }
  },
  "frequencyCaps": [
    {
      "id": "fc_1",
      "max_impressions": 3,
      "window": { "interval": 7, "unit": "days" },
      "targetLevel": "ADVERTISER",
      "targetId": "12345",
      "createdAt": "2025-01-15T10:30:00Z",
      "updatedAt": "2025-01-15T10:30:00Z"
    }
  ],
  "createdAt": "2025-01-15T10:30:00Z",
  "updatedAt": "2025-01-20T14:45:00Z"
}