User object

Field	Data type	Description
userID	string	User unique ID
email	string	User email
createdAt	string	Timestamp of user creation
lastSeen	string	Timestamp of last connection

{
    "userID": "123456789abc",
    "email": "[e-mail]",
    "createdAt": "1654271138076",
    "lastSeen": "1655271138076"
}