WooCommerce API Rest problem

My problem is that when I consume the woocommerce API I get the following error:
“Code”: “woocommerce_api_authentication_error”,
“Message”: “Invalid signature – provided signature does not match.”
My code is in php and it is the following:

<?php
require __DIR__ . '/vendor/autoload.php';

use Automattic\WooCommerce\Client;

$woocommerce = new Client(
    'https://url.com/', 
    'ckey', 
    'cskey',
    [
        'wp_api' => true,
        'version' => 'wc/v3',
    ]
);

print_r($woocommerce->get(''));

?>

I’ve read out there that it’s because my site is http,
I would like to create a signature that I think that’s what I need, and the Woocommerce documentation I don’t understand (https://woocommerce.github.io/woocommerce-rest-api-docs/?php#authentication-over-http)

I hope your help, thanks