Ack, I worded my question incorrectly.
I did indeed see fetch_userid_from_username() and fetch_userinfo(). However, those can only be used to get a user's info. Once you have that info, it's not possible to update it. Correct?
Using the vB API, is it possible to get a "user object", through which the user's data can be updated? For example:
PHP Code:
$user = some_fetch_function($a_user_name);
$user->password = 'something new';
$user->save();
Thanks,
Nick