User schema
| Name | Type | Description | Notes |
|---|---|---|---|
| username | String | User login | [optional] [readonly] |
| firstName | String | First name of the user | [optional] |
| lastName | String | Last name of the user | [optional] |
| String | Email of the user | [optional] | |
| phone | String | User's phone (may be cellphone or phone) | [optional] |