Problem requesting store access token

Hello, i am folowing this tutorial: Shopify App Development: How To Create Shopify Apps Locally - YouTube
my app installs fine, hmac is verified ,the problem is when requesting the store access token.
here is my code for the token.php file

 '')); // Remove hmac from params
ksort($params); // Sort params lexographically

$computed_hmac = hash_hmac('sha256', http_build_query($params), $shared_secret);

// Use hmac data to check that the response is from Shopify or not
if (hash_equals($hmac, $computed_hmac)) {

	// Set variables for our request
	$query = array(
		"client_id" => $api_key, // Your API key
		"client_secret" => $shared_secret, // Your app credentials (secret key)
		"code" => $params['code'] // Grab the access key from the URL
	);

	// Generate access token URL
	$access_token_url = "https://" . $params['shop'] . "/admin/oauth/access_token";

	// Configure curl client and execute request
	$ch = curl_init();
	echo var_dump($ch);
	echo var_dump($access_token_url);
	echo var_dump($query);
	curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
	curl_setopt($ch, CURLOPT_URL, $access_token_url);
	curl_setopt($ch, CURLOPT_POST, count($query));
	curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($query));
	echo var_dump(http_build_query($query));
	$result = curl_exec($ch);
	curl_close($ch);
	echo var_dump($result);
	// Store the access token
	$result = json_decode($result, true);
	$access_token = $result['access_token'];
	echo var_dump($result);

	// Show the access token (don't do this in production!)
	echo var_dump($access_token);
	echo "# testing heeyyy macarena" . $access_token;

} else {
	// Someone is trying to be shady!
	die('This request is NOT from Shopify!');
}

and here what this outputs:

Thank you!

when adding

echo curl_error($ch);

i get “error SSL certificate problem: unable to get local issuer certificate”

Hi @fredbleu

“SSL certificate problem: unable to get local issuer certificate” is a problem you can run into locally when your curl isn’t set up to handle https correctly. You’ll need to set up SSL in your environment. While I don’t have specific instructions on how to set that up, I hope this helps point you towards a solution!

i found how to make it work.
i had to download and then add a certain cacert.pem file to be loaded in my php.ini of my local server.
PHP - SSL certificate error: unable to get local issuer certificate - Stack Overflow