code: private static AdCustomizerFeed createCustomizerFeed(AdWordsServicesInterface adWordsServices,
        AdWordsSession session, String feedName) throws RemoteException {
      // Get the AdCustomizerFeedService.
      AdCustomizerFeedServiceInterface adCustomizerFeedService =
          adWordsServices.get(session, AdCustomizerFeedServiceInterface.class);
      AdCustomizerFeed customizerFeed = new AdCustomizerFeed();
      customizerFeed.setFeedName(feedName);
  
      AdCustomizerFeedAttribute nameAttribute = new AdCustomizerFeedAttribute();
      nameAttribute.setName("Name");
      nameAttribute.setType(AdCustomizerFeedAttributeType.STRING);
  
      AdCustomizerFeedAttribute priceAttribute = new AdCustomizerFeedAttribute();
      priceAttribute.setName("Price");
      priceAttribute.setType(AdCustomizerFeedAttributeType.STRING);
  
      AdCustomizerFeedAttribute dateAttribute = new AdCustomizerFeedAttribute();
      dateAttribute.setName("Date");
      dateAttribute.setType(AdCustomizerFeedAttributeType.DATE_TIME);
  
      customizerFeed.setFeedAttributes(
          new AdCustomizerFeedAttribute[] {nameAttribute, priceAttribute, dateAttribute});
  
      AdCustomizerFeedOperation feedOperation = new AdCustomizerFeedOperation();
      feedOperation.setOperand(customizerFeed);
      feedOperation.setOperator(Operator.ADD);
  
      AdCustomizerFeed addedFeed = adCustomizerFeedService.mutate(
          new AdCustomizerFeedOperation[] {feedOperation}).getValue()[0];
  
      System.out.printf(
          "Created ad customizer feed with ID %d, name '%s' and attributes:%n",
          addedFeed.getFeedId(), addedFeed.getFeedName());
      for (AdCustomizerFeedAttribute feedAttribute : addedFeed.getFeedAttributes()) {
        System.out.printf(
            "  ID: %d, name: '%s', type: %s%n",
            feedAttribute.getId(), feedAttribute.getName(), feedAttribute.getType());
      }
      return addedFeed;
    }
docs: Creates a new AdCustomizerFeed.
  
  @param feedName the name of the new AdCustomizerFeed
  @return The new AdCustomizerFeed