Access token is not being accepted from local server

request:

public function getDropboxMetadata($url, $token)
{
	$ch = curl_init();

	curl_setopt($ch, CURLOPT_URL, 'https://api.dropboxapi.com/2/sharing/get_shared_link_metadata');
	curl_setopt($ch, CURLOPT_HTTPHEADER, [
		'Authorization: Bearer ' . $token,
		'Content-Type: application/json']);
	curl_setopt($ch, CURLOPT_POST, true);
	curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
	curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode(['url' => $url]));

	$result = curl_exec($ch);

	curl_close($ch);

	return $result;
}

response:

error: {
	code: 401,
	errors: {
		0: {
			domain: "global",
			location: "Authorization",
			locationType: "header",
			message: "Invalid Credentials",
			reason: "authError"
		}
	},
	message: "Invalid Credentials"
}