code: def importCASignedCertificate(self, alias, caSignedCertificate):
          
          url = self._url + "/sslcertificates/importCASignedCertificate"
          files = {}
          files['caSignedCertificate'] = caSignedCertificate
          params = {
              "f" : "json",
              "alias" : alias
          }
          return self._post(url=url,
                            param_dict=params,
                            securityHandler=self._securityHandler,
                            files=files,
                            proxy_url=self._proxy_url,
                            proxy_port=self._proxy_port)
docs: This operation imports a certificate authority (CA)-signed SSL certificate into the key store.