Allowed fields:
- first_name
- last_name
- email
- birthday
- phone
- gender
- city
- state
- zip
- address
- address_2
- join_date
- source_id
- source
Each account has their own user attribute values.
Example
"attributes": {
"eye_color": "blue",
"last_contact_date": "2019-09-01"
}