const url = 'https://api.thanks.io/api/v2/mailing-lists/{mailingListId}';
const options = {method: 'DELETE', headers: {Authorization: 'Bearer <token>'}, body: undefined};

try {
  const response = await fetch(url, options);
  const data = await response.json();
  console.log(data);
} catch (error) {
  console.error(error);
}

{
  "message": "success"
}