pay.jp の顧客情報を取得方法

Question

pay jpを使って決済プログラミングをやっています。
php sdkを利用して、顧客情報を取得しようとしたら、オブジェクト形で戻って来てるらしいです。
そして、protectedにもなっていますが、なぜかわかりません。
このままだと、取得できてるとは言えないことですね

###戻って来たオブジェクト

Payjp\Customer Object
(
    [_opts:protected] => Payjp\Util\RequestOptions Object
        (
            [headers] => Array
                (
                )

            [apiKey] => sk_test_1384d40f0c1466976279fd09
        )

    [_values:protected] => Array
        (
            [id] => 13
            [cards] => Payjp\Collection Object
                (
                    [_opts:protected] => Payjp\Util\RequestOptions Object
                        (
                            [headers] => Array
                                (
                                )

                            [apiKey] => sk_test_1384d40f0c1466976279fd09
                        )

                    [_values:protected] => Array
                        (
                            [count] => 1
                            [data] => Array
                                (
                                    [0] => Payjp\Card Object
                                        (
                                            [_opts:protected] => Payjp\Util\RequestOptions Object
                                                (
                                                    [headers] => Array
                                                        (
                                                        )

                                                    [apiKey] => sk_test_1384d40f0c1466976279fd09
                                                )

                                            [_values:protected] => Array
                                                (
                                                    [id] => car_611b89e4617f0ccf0f015c6b3221
                                                    [address_city] => 
                                                    [address_line1] => 
                                                    [address_line2] => 
                                                    [address_state] => 
                                                    [address_zip] => 
                                                    [address_zip_check] => unchecked
                                                    [brand] => Visa
                                                    [country] => 
                                                    [created] => 1509066744
                                                    [customer] => 13
                                                    [cvc_check] => passed
                                                    [exp_month] => 12
                                                    [exp_year] => 2022
                                                    [fingerprint] => 318dfe39ccf530bbfdd157d61a4c2b09
                                                    [last4] => 0202
                                                    [livemode] => 
                                                    [metadata] => Array
                                                        (
                                                        )

                                                    [name] => AAAA
                                                    [object] => card
                                                )

                                            [_unsavedValues:protected] => Payjp\Util\Set Object
                                                (
                                                    [_elts:Payjp\Util\Set:private] => Array
                                                        (
                                                        )

                                                )

                                            [_transientValues:protected] => Payjp\Util\Set Object
                                                (
                                                    [_elts:Payjp\Util\Set:private] => Array
                                                        (
                                                        )

                                                )

                                            [_retrieveOptions:protected] => Array
                                                (
                                                )

                                        )

                                )

                            [has_more] => 
                            [object] => list
                            [url] => /v1/customers/13/cards
                        )

                    [_unsavedValues:protected] => Payjp\Util\Set Object
                        (
                            [_elts:Payjp\Util\Set:private] => Array
                                (
                                )

                        )

                    [_transientValues:protected] => Payjp\Util\Set Object
                        (
                            [_elts:Payjp\Util\Set:private] => Array
                                (
                                )

                        )

                    [_retrieveOptions:protected] => Array
                        (
                        )

                )

            [created] => 1509066744
            [default_card] => car_611b89e4617f0ccf0f015c6b3221
            [description] => 
            [email] => [e-mail]
            [livemode] => 
            [metadata] => Array
                (
                )

            [object] => customer
            [subscriptions] => Payjp\Collection Object
                (
                    [_opts:protected] => Payjp\Util\RequestOptions Object
                        (
                            [headers] => Array
                                (
                                )

                            [apiKey] => sk_test_1384d40f0c1466976279fd09
                        )

                    [_values:protected] => Array
                        (
                            [count] => 0
                            [data] => Array
                                (
                                )

                            [has_more] => 
                            [object] => list
                            [url] => /v1/customers/13/subscriptions
                        )

                    [_unsavedValues:protected] => Payjp\Util\Set Object
                        (
                            [_elts:Payjp\Util\Set:private] => Array
                                (
                                )

                        )

                    [_transientValues:protected] => Payjp\Util\Set Object
                        (
                            [_elts:Payjp\Util\Set:private] => Array
                                (
                                )

                        )

                    [_retrieveOptions:protected] => Array
                        (
                        )

                )

        )

    [_unsavedValues:protected] => Payjp\Util\Set Object
        (
            [_elts:Payjp\Util\Set:private] => Array
                (
                )

        )

    [_transientValues:protected] => Payjp\Util\Set Object
        (
            [_elts:Payjp\Util\Set:private] => Array
                (
                )

        )

    [_retrieveOptions:protected] => Array
        (
        )

)

どうしたらいいですか？

Comments

[CHERRY]

どのようなコードを実行して、この結果を得たのでしょうか？　また、「protected にもなっていますが、なぜかわかりません。」と書かれていますが、 protected は、どのような意味だと思われていますか？