stdClass Object ( [type] => https://mailchimp.com/developer/marketing/docs/errors/ [title] => API Key Invalid [status] => 401 [detail] => Your API key may be invalid, or you've attempted to access the wrong datacenter. [instance] => 5ac38f17-ef9d-5995-c70d-0d5dc91b0ac9 ) mail sent
This is test page