code: def get_certificate(self, certificate_id):
          
          api = self._get_api(iam.DeveloperApi)
          certificate = Certificate(api.get_certificate(certificate_id))
          self._extend_certificate(certificate)
          return certificate
docs: Get certificate by id.
  
          :param str certificate_id: The certificate id (Required)
          :returns: Certificate object
          :rtype: Certificate