request('POST', $this->base_url, [ 'form_params' => [ 'grant_type' => 'client_credentials', 'client_id' => 'PKL2023', 'client_secret' => 'PKLSERU' ] ]); // Ambil respons JSON dari server $response = $request->getBody()->getContents(); // Parsing respons JSON untuk mendapatkan token $data = json_decode($response, true); // Mengembalikan access token return $data['access_token']; } }