php openid connect get token

Question

I try to use jumbojett library for php and openid. I made connection but and get secret id and client, but when I want to get token I don't know how.

In small documentation is next example:

$oidc = new OpenIDConnectClient('https://id.provider.com',
                                'ClientIDHere',
                                'ClientSecretHere');
$oidc->providerConfigParam(array('token_endpoint'=>'https://id.provider.com/connect/token'));
$oidc->addScope('my_scope');

// this assumes success (to validate check if the access_token property is there and a valid JWT) :
$clientCredentialsToken = $oidc->requestClientCredentialsToken()->access_token;

But function requestClientCredentialsToken() doesn't exist in library. Does anyone know how to get token or to recommend some another php library where I can define scope, redirect uri, get client secret and id from open server and offcourse to get token.

Thanks in advance