Google\Client Object
(
    [auth:Google\Client:private] => 
    [http:Google\Client:private] => 
    [cache:Google\Client:private] => 
    [token:Google\Client:private] => 
    [config:Google\Client:private] => Array
        (
            [application_name] => 
            [base_path] => https://www.googleapis.com
            [client_id] => 100213961267138821233
            [client_secret] => 
            [credentials] => 
            [scopes] => 
            [quota_project] => 
            [redirect_uri] => 
            [state] => 
            [developer_key] => 
            [use_application_default_credentials] => 1
            [signing_key] => -----BEGIN PRIVATE KEY-----
MIIEvQIBADANBgkqhkiG9w0BAQEFAASCBKcwggSjAgEAAoIBAQC1HYcfdMmt5N3v
+hsexXsbx8CLYzgJQHhkRgkrr0WKNdDPx+df9sK4bcpZ7jzXUs2YBxmQqgh3YIDE
32ZclaKt5CqvzIeDbqa6wHQJ7GHKinfiHzAuyq5voxPyEfaYI8vjWbLEEpf4u9QO
wyYB1P4ZTb0XRWlvYcqR05KCjCYa3HdQH71vQ0mv30Z9P5+BGYdtcjrJ1g1sPmzA
lIK/CujXPP1wmSI1+qQl9DWacH0hW1P2h1Q2Grfp8E87xsgmhAx5Rzek8AXzYDkk
lOLZHIE0jMUENU9fDPnAuQrrkeevzm/Q679jslIZVEMV5ijEPDs5JRk2Z30nuhQG
LRm1yVbRAgMBAAECggEAFu3jEndtpQdJlb0bO90SheTXGo54JKu10jQPqykoa6P+
iJ+tSjfqVQEJUjNYHoaMIsgbU3ZDViGwi7wgsG39R3iQcus46MnUb+Y3ip4Tj1nS
bZ03M2VTiiyiNM5TYtV9VY4glLQp60KUST4pjKfTd46g9tZBz+kYhTe836wwksvJ
qqv8hw6fasUh2JsA/oa6L+2IWM3hUo5fEDKC6fs8jw3xDpFALGo6Iz+UnrFA0om1
TrZJoKx6ftA1eygGO8VnGq9KmezxIRQwW+RNUeT1baYK8MxId7GIOeNKoDo92bJx
Xvvo7UiJNQjpOVZIaXX9hTvI4tQSWVhx539ZD2suVQKBgQDxWjoHkYTvfv6pz2aU
dh8GLbGum49C4KNGEkcVgBhFeu5nwpY8VQWBCuA+uKiiIvwVpPhMX3nNgTZLhCSE
ei+ww6SrczveUsBq0bU4kDSi8dRNi9l2Vnl0jrgpaM3vm10YEC9ay1Axj2s57yrM
qlIrQqJGgyqaEU7Ht85Ay1j2QwKBgQDAG21XO+gtKXx4Vy6ddkyWNbuqAbcwuNkm
SwaU0Smqep8cj10ATO+gwvdV3+cIknz98W2yfve0R//EfDFDVw8QFRYue3XLzcEt
UoOO0XWStcM3e5dzVnP9TI2flurnsq/CZ19eirNSMmc5B6VOeK/fDTXmJoL7qm9F
ReiYd8avWwKBgH6uTC0yzWLj9oltCju8sFYO3+d1UUHaJPkfmN4JKTQ27THbKf4q
5kOwULm7NRA9arF1sLptlsIuIzCKAJzkgWm3lxRC3Na5+rNWtVcmIeqxIi09zXvW
sdNjIfjiQM2Wb8u0mxZ+Bu6sh6yWA5H/iDeatxBpwo+xq/caXBEYau5/AoGAZ6rl
WFvlsOlgV/iEGUkLj0uz18xRNSOrWzTFem1dFLhTQLBEubLK5XAQ1PCc1k1m0gsE
7XwC4/CunzN9yh8i68TVUYQiTzbbdj++6sUxs1gO3tP9KKqQsTIsguCIJzyQCFKM
bpJero6wkWAE3tHV5oJUgbxqlrCklzdgi1ani10CgYEAjFgwHgRu//mWMijQ47IX
ZDVWbCF9L0mpRGMNPJzGVdHsQkrOzMLMTB938/GAEPq6GsbjFw7AhuGKVb6+1HnF
d6e1Y1WpKA7Lo0286G77pVMoUIAx1pH40W5LVZRn7P+wgwFqs5YHIFg5hOHT51Hb
uOesSEKvT/paNlXDkzbDoPU=
-----END PRIVATE KEY-----

            [signing_algorithm] => HS256
            [subject] => 
            [hd] => 
            [prompt] => 
            [openid.realm] => 
            [include_granted_scopes] => 
            [login_hint] => 
            [request_visible_actions] => 
            [access_type] => online
            [approval_prompt] => auto
            [retry] => Array
                (
                )

            [retry_map] => 
            [cache] => 
            [cache_config] => Array
                (
                )

            [token_callback] => Closure Object
                (
                    [this] => Google\Client Object
 *RECURSION*
                    [parameter] => Array
                        (
                            [$cacheKey] => <required>
                            [$newAccessToken] => <required>
                        )

                )

            [jwt] => 
            [api_format_v2] => 
            [universe_domain] => googleapis.com
            [client_email] => firebase-adminsdk-m856w@sinoutt-44f92.iam.gserviceaccount.com
        )

    [logger:Google\Client:private] => 
    [credentials:Google\Client:private] => 
    [deferExecution:Google\Client:private] => 
    [requestedScopes:protected] => Array
        (
        )

)
Aqui