'{"type":"https://mailchimp.com/developer/marketing/docs/errors/","title":"Invalid Resource","status":400,"detail":"The resource submitted could not be validated. For field-specific details, see the \'errors\' array.","instance":"4b009f42-b426-8c6e-e352-f1348c6a6a7b","errors":[{"field":"email_address","message":"This value should not be blank."}]}'