code: def set_monthly_billing(self, currency, client_pays, markup_percentage, monthly_scheme=None):
          
          body = {
              "Currency": currency,
              "ClientPays": client_pays,
              "MarkupPercentage": markup_percentage}
  
          if monthly_scheme is not None:
              body["MonthlyScheme"] = monthly_scheme
  
          response = self._put(self.uri_for(
              'setmonthlybilling'), json.dumps(body))
docs: Sets the monthly billing settings for this client.