code: func (b *Backend) getExpirationTimestamp() int32 {
  	expiresIn := b.GetConfig().ResultsExpireIn
  	if expiresIn == 0 {
  		// // expire results after 1 hour by default
  		expiresIn = config.DefaultResultsExpireIn
  	}
  	return int32(time.Now().Unix() + int64(expiresIn))
  }
docs: // getExpirationTimestamp returns expiration timestamp