code: def prepare(self):
          
          headers = self.prepare_headers(self.http_headers, self.soap_action)
  
          soap_header = self.prepare_soap_header(self.soap_header)
          soap_body = self.prepare_soap_body(
              self.method, self.parameters, self.namespace
          )
          data = self.prepare_soap_envelope(soap_header, soap_body)
          return (headers, data)
docs: Prepare the SOAP message for sending to the server.