code: def render_confirm_form(self):
          
          warn_untested()
          initial = dict(token=self.request.GET['token'], PayerID=self.request.GET['PayerID'])
          self.context[self.form_context_name] = self.confirm_form_cls(initial=initial)
          return TemplateResponse(self.request, self.confirm_template, self.context)
docs: Second step of ExpressCheckout. Display an order confirmation form which
          contains hidden fields with the token / PayerID from PayPal.