public void setWatchlistIds(java.util.Collection<String> watchlistIds) {
        if (watchlistIds == null) {
            this.watchlistIds = null;
            return;
        }

        this.watchlistIds = new java.util.ArrayList<String>(watchlistIds);
    }
<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>

@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.
aws-java-sdk-voiceid/src/main/java/com/amazonaws/services/voiceid/model/RegistrationConfig.java