code: public BatchUpdatePhoneNumberRequest withUpdatePhoneNumberRequestItems(UpdatePhoneNumberRequestItem... updatePhoneNumberRequestItems) {
          if (this.updatePhoneNumberRequestItems == null) {
              setUpdatePhoneNumberRequestItems(new java.util.ArrayList<UpdatePhoneNumberRequestItem>(updatePhoneNumberRequestItems.length));
          }
          for (UpdatePhoneNumberRequestItem ele : updatePhoneNumberRequestItems) {
              this.updatePhoneNumberRequestItems.add(ele);
          }
          return this;
      }
docs: <p>
  The request containing the phone number IDs and product types to update.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setUpdatePhoneNumberRequestItems(java.util.Collection)} or
  {@link #withUpdatePhoneNumberRequestItems(java.util.Collection)} if you want to override the existing values.
  </p>
  
  @param updatePhoneNumberRequestItems
  The request containing the phone number IDs and product types to update.
  @return Returns a reference to this object so that method calls can be chained together.