A customer.
| Name | Type | Description | 
|---|---|---|
| string | The customer's email. | |
| firstName | string | The customer's first or birth name. | 
| lastName | string | The customer's last or family name. | 
| isSubscribed | boolean | Whether the customer is subscribed to the newsletter. | 
| addresses | DaffCustomerAddress[] | A list of the customer's stored addresses. |