public RegistrationConfig withWatchlistIds(String... watchlistIds) {
        if (this.watchlistIds == null) {
            setWatchlistIds(new java.util.ArrayList<String>(watchlistIds.length));
        }
        for (String ele : watchlistIds) {
            this.watchlistIds.add(ele);
        }
        return this;
    }
<p>
The identifiers of watchlists that a fraudster is registered to. If a watchlist isn't provided, the fraudsters
are registered to the default watchlist.
</p>
<p>
<b>NOTE:</b> This method appends the values to the existing list (if any). Use
{@link #setWatchlistIds(java.util.Collection)} or {@link #withWatchlistIds(java.util.Collection)} if you want to
override the existing values.
</p>

@param watchlistIds
       The identifiers of watchlists that a fraudster is registered to. If a watchlist isn't provided, the
       fraudsters are registered to the default watchlist.
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-voiceid/src/main/java/com/amazonaws/services/voiceid/model/RegistrationConfig.java