$search = $c->userService()->searchUsers('californiaUser', 'organization_1');
$californiaUser = $c->userService()->getUserByLookup($search[0]);

$californiaUser->emailAddress('sanfrancisco-oakland@example.com');
$californiaUser->password('SUPERstrongPASSWORD###!!!');

try {
    $c->userService()->addOrUpdateUser($californiaUser);
} catch (Exception $e) {
    printf('Attempt to modify the user failed with error: %s', $e->getMessage());
}
  