Get a client by ID

{
  "id": "CL-OvmDp2yvv1yqMwRl",
  "serialId": 1023,
  "firstName": "John",
  "lastName": "Doe",
  "fullName": "John Doe",
  "companyName": "John Doe Inc.",
  "description": "This is a description",
  "email": "john.doe@example.com",
  "primaryExt": "123",
  "primaryPhone": "1234567890",
  "secondaryExt": "456",
  "secondaryPhone": "1234567890",
  "country": "USA",
  "state": "NY",
  "city": "New York",
  "zipcode": "10001",
  "unit": "100",
  "address": "123 Main St",
  "serviceAddress": "123 Main St, New York, NY 10001",
  "billingAddress": "123 Main St, New York, NY 10001",
  "allowBilling": true,
  "taxExempt": true,
  "taxExemptReason": "9",
  "adGroup": {
    "id": "AG-71b8d7310acbf8cc",
    "name": "Ad Group 1"
  },
  "tags": [
    {
      "id": "TAG-211d1676f4b90c40",
      "name": "Tag 1",
      "color": "#edce4c"
    }
  ],
  "parentClient": {
    "id": "CL-OvmDp2yvv1yqMwRl",
    "serialId": 1023,
    "firstName": "John",
    "lastName": "Doe",
    "fullName": "John Doe",
    "companyName": "John Doe Inc.",
    "description": "This is a description",
    "email": "john.doe@example.com",
    "primaryExt": "123",
    "primaryPhone": "1234567890",
    "secondaryExt": "456",
    "secondaryPhone": "1234567890",
    "country": "USA",
    "state": "NY",
    "city": "New York",
    "zipcode": "10001",
    "unit": "100",
    "address": "123 Main St",
    "serviceAddress": "123 Main St, New York, NY 10001",
    "billingAddress": "123 Main St, New York, NY 10001",
    "allowBilling": true,
    "taxExempt": true,
    "taxExemptReason": "9"
  },
  "clientContacts": [
    {
      "id": "CLC-211d1676f4b90c40",
      "firstName": "John",
      "lastName": "Doe",
      "fullName": "John Doe",
      "email": "john.doe@example.com",
      "primaryPhone": "1234567890",
      "secondaryPhone": "1234567890",
      "country": "USA",
      "state": "NY",
      "city": "New York",
      "zipcode": "10001",
      "address": "123 Main St",
      "role": "Property Manager",
      "note": "Prefers contact by email."
    }
  ],
  "notes": [
    {
      "id": "CLN-211d1676f4b90c40",
      "note": "Customer requested a follow-up call.",
      "techName": "John Doe",
      "createdAt": "2021-01-01 00:00:00"
    }
  ],
  "customFields": [
    {
      "id": "CF-eYLPK7198xVp6Z8q",
      "fieldName": "Custom Field 1",
      "value": "John Doe"
    }
  ],
  "created": "2026-01-01 00:00:00"
}