docs: public GetReservationPurchaseRecommendationResult withRecommendations(ReservationPurchaseRecommendation... recommendations) {
          if (this.recommendations == null) {
              setRecommendations(new java.util.ArrayList<ReservationPurchaseRecommendation>(recommendations.length));
          }
          for (ReservationPurchaseRecommendation ele : recommendations) {
              this.recommendations.add(ele);
          }
          return this;
      }