str
A unique user identification string, as determined by the
client. The maximum number of allowed characters is 255.
Allowed characters include numbers 0 to 9, uppercase and
lowercase letters, and restricted special symbols (:, @, +,
-, \_, `) The format is "user:xxxx@example.com";
group_ids
MutableSequence[str]
The unique group identifications which the
user is belong to. The format is
"group:yyyy@example.com";