Retrieve customer details by ID

{
    "id": "c9a1f6c2-8c2b-4c91-9f7b-2e5b8b0d3a01",
    "firstName": "John",
    "lastName": "Doe",
    "companyName": "Acme Heating Services",
    "displayName": "John Doe - Acme Heating Services",
    "address1": "123 Main St",
    "address2": "Suite 200",
    "city": "Dallas",
    "state": "TX",
    "zip": "75201",
    "billingAddress1": "123 Main St",
    "billingAddress2": "Suite 200",
    "billingCity": "Dallas",
    "billingState": "TX",
    "billingZip": "75201",
    "primaryPhone": "+1-214-555-0198",
    "primaryEmail": "john.doe@acmeheating.com",
    "contactOnPhone": true,
    "contactOnSms": true,
    "contactOnEmail": true,
    "active": true,
    "billFromOffice": false,
    "parentCustomerId": "a7b2d1e3-5f89-4b1d-9a6e-2c9b8f2a0b44"
}