$r    = (new \GuzzleHttp\Client())->request('POST', 'http://test.pl/zapisz?api_token=as90daj9dm93amiosjd93wnfjsdnf93nwfiefdsf', [
                'headers' => ['Content-Type' => 'application/json', 'Accept' => 'application/json'],
                'body' => $data
            ]
        );