I try to adding people to circle by this code:
$this->google = new \Google_Service_PlusDomains($this->client);
......
$this->google->circles->addPeople(
$circleId, ['userId' => $userId]
);
I get the error:
Error calling PUT https://www.googleapis.com/plusDomains/v1/circles/{Circle_ID}/people?userId={USER_ID}:
(403) The operation is not allowed because the requested people are not part of the domain
I see in Google Plus Domain document, but It have not php example (just java and ruby): https://developers.google.com/+/domains/circles/adding