https://www.googleapis.com/youtube/v3/playlists?part=snippet,contentDetails&channelId=GlobalKonguFoundation&key=AIzaSyDI5NoN7kAXgUULQqe0ZiffAjAMjiaKv7A

Array
(
    [error] => Array
        (
            [code] => 403
            [message] => Requests from referer  are blocked.
            [errors] => Array
                (
                    [0] => Array
                        (
                            [message] => Requests from referer  are blocked.
                            [domain] => global
                            [reason] => forbidden
                        )

                )

            [status] => PERMISSION_DENIED
            [details] => Array
                (
                    [0] => Array
                        (
                            [@type] => type.googleapis.com/google.rpc.ErrorInfo
                            [reason] => API_KEY_HTTP_REFERRER_BLOCKED
                            [domain] => googleapis.com
                            [metadata] => Array
                                (
                                    [service] => youtube.googleapis.com
                                    [consumer] => projects/119102092143
                                )

                        )

                )

        )

)
Array
(
)