As an AuthToken.
Source
AuthToken asToken() {
return new AuthToken()
..accessToken = accessToken
..refreshToken = refreshToken
..issueDate = issueDate
..expirationDate = expirationDate
..type = type
..resourceOwnerIdentifier = resourceOwner.id
..scopes = scope?.split(" ")?.map((s) => new AuthScope(s))?.toList()
..clientID = client.id;
}