def create
      request = Request.put_xml("pre-approvals/#{code}/discount", credentials, xml_params)

      Response.new(request, self).serialize

      self
    end
def create
      request = Request.put_xml("pre-approvals/#{code}/discount", credentials, xml_params)

      Response.new(request, self).serialize

      self
    end
The server returns only with a 200 response in case of success.