code: public void setFirstPageCpc(com.google.api.ads.adwords.axis.v201809.cm.Bid firstPageCpc) {
          this.firstPageCpc = firstPageCpc;
      }
docs: Sets the firstPageCpc value for this BiddableAdGroupCriterion.
  
  @param firstPageCpc   * First page Cpc for this criterion.
  <span class="constraint ReadOnly">This field is
  read only and will be ignored when sent to the API.</span>