You can get an alert when a domain is about to expire in 30 days by using the WhoisXMLAPIhttps://www.whoisxmlapi.com/. Creating API key Create a user at WhoisXMLAPIhttps://www.whoisxmlapi.com/ Get your API key from menu/settings under general. Add the API Key replacing APIFROMWHOISXMLAPI with the API at the script....
