How to use linkedin and guzzle?

How do I make calls to the linkedin api using guzzle? So far I've tried

    $client = new \GuzzleHttp\Client(['base_uri' => 'http://ift.tt/Q8Kdgr']);
    $access_token = 'the_access_token';
    $req = $client->request('POST', '/v1/people/~?format=json', [
            'headers'       => ["Authorization" => "Bearer " . $access_token,
            "Content-Type"  => "application/json", "x-li-format"=>"json"],
            'client_id'     => 'the_client_id',
            'client_secret' => 'the_client_secret',
            'connection'    => 'Keep-Alive'
        ]);
    dd($req);

but I just get an error that reads:

Client error: POST http://ift.tt/12v7394 resulted in a 405

Im working with laravel 5.1 and guzzle 6.2.

via Chebli Mohamed