AdvertiserListResponse

{
    "advertiserIds": [
        "123e4567-e89b-12d3-a456-426614174000",
        "223e4567-e89b-12d3-a456-426614174001"
    ],
    "advertiserEntities": {
        "123e4567-e89b-12d3-a456-426614174000": {
            "id": "123e4567-e89b-12d3-a456-426614174000",
            "clientId": "johnopp",
            "clientName": "John's Organization",
            "name": "ACME Corporation",
            "createdAt": "2024-01-15T10:30:00Z",
            "updatedAt": "2024-01-20T14:45:00Z",
            "userCount": 5
        }
    },
    "totalCount": 15
}