code: public void setPremiumFeature(com.google.api.ads.admanager.axis.v201902.PremiumFeature premiumFeature) {
          this.premiumFeature = premiumFeature;
      }
docs: Sets the premiumFeature value for this PremiumRateValue.
  
  @param premiumFeature   * The feature type of this premium rate value.
  
  <p>This attribute is required and cannot be changed
  after creation.