code: public String summarize()
      {
          return String.format(SUMMARY_FORMAT, action, responseContent,
                  accessToken, accessTokenExpiresAt, accessTokenDuration,
                  refreshToken, refreshTokenExpiresAt, refreshTokenDuration,
                  clientId, clientIdAlias, clientIdAliasUsed, subject,
                  Utils.join(scopes, " "), Utils.stringifyProperties(properties),
                  jwtAccessToken);
      }
docs: Get the summary of this instance.