code: def get_usage(self, start=None, end=None):
          
          method = 'GET'
          endpoint = '/rest/v1/users/{}/usage'.format(self.client.sauce_username)
          data = {}
          if start:
              data['start'] = start
          if end:
              data['end'] = end
          if data:
              endpoint = '?'.join([endpoint, urlencode(data)])
          return self.client.request(method, endpoint)
docs: Access historical account usage data.