code: def authenticated_query(
          self,
          with_message=None,
          username=None,
          password=None
      ):
          
          u = username or self.institution.username
          p = password or self.institution.password
  
          contents = ['OFX', self._signOn(username=u, password=p)]
          if with_message:
              contents.append(with_message)
          return LINE_ENDING.join([self.header(), _tag(*contents)])
docs: Authenticated query
  
          If you pass a 'with_messages' array those queries will be passed along
          otherwise this will just be an authentication probe query only.