code: public EventSubscription withEventCategoriesList(String... eventCategoriesList) {
          if (this.eventCategoriesList == null) {
              setEventCategoriesList(new java.util.ArrayList<String>(eventCategoriesList.length));
          }
          for (String ele : eventCategoriesList) {
              this.eventCategoriesList.add(ele);
          }
          return this;
      }
docs: <p>
  A list of event categories for the event notification subscription.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setEventCategoriesList(java.util.Collection)} or {@link #withEventCategoriesList(java.util.Collection)}
  if you want to override the existing values.
  </p>
  
  @param eventCategoriesList
  A list of event categories for the event notification subscription.
  @return Returns a reference to this object so that method calls can be chained together.