Get the authenticated user

{
  "required": [
    "createdAt",
    "displayName",
    "email",
    "id"
  ],
  "properties": {
    "createdAt": {
      "type": "string",
      "format": "date-time"
    },
    "displayName": {
      "type": "string"
    },
    "email": {
      "type": "string"
    },
    "id": {
      "type": "string"
    },
    "photoURL": {
      "type": "string"
    }
  }
}