How to make a Machine to Machine call from one microservice to the other: Using Guzzle

use GuzzleHttp\Exception\GuzzleException;
use GuzzleHttp\Exception\RequestException;
use GuzzleHttp\Client;

	public static function getTestApiRespone(string $access_token) {
        try {
            $http = new Client(); //GuzzleHttp\Client
            $response = $http->get(
                'http://surgery-planet-quote-booking/api/test',
                [
                    'headers' => [
                        'Accept'     => 'html',
                        'Authorization' => 'Bearer ' . $access_token
                    ]
                ]
            );
            return $response->getBody();
        } catch (RequestException $e) {
            /*Debugbar::error('Inside Helper->getQuoteBookingForm()->CATCH BLOCK');
            Debugbar::error($e);
            Debugbar::error($e->getMessage());
            Debugbar::error('Exiting from Helper->getQuoteBookingForm()->CATCH BLOCK');*/
            return $e->getResponse()->getStatusCode() . ': ' . $e->getMessage();
        }
    }

    public static function getTestApiResponeWithAuth() {
        try {
            $http = new Client(); //GuzzleHttp\Client
            $response = $http->post(
                'http://surgery-planet-quote-booking/oauth/token',
                [
                    'form_params' => [
                        'grant_type' => 'client_credentials',
                        'client_id' => '6',
                        'client_secret' => 'YoaLmACopaMUTZsmB4fsxtn6OEMGQj7FqZsbazwQ',
                        'redirect_uri' => '',
                    ],
                ]
            );
            $array = $response->getBody()->getContents();
            $json = json_decode($array, true);
            $collection = collect($json);
            $access_token = $collection->get('access_token');
            return Helper::getTestApiRespone($access_token);
        } catch (RequestException $e) {
            /*Debugbar::error('Inside Helper->getQuoteBookingFormWithAuth()->CATCH BLOCK');
            Debugbar::error($e);
            Debugbar::error($e->getMessage());
            Debugbar::error('Exiting from Helper->getQuoteBookingFormWithAuth()->CATCH BLOCK');*/
            return $e->getResponse()->getStatusCode() . ': ' . $e->getMessage();
        }
    }