PopConfig popConfig = new PopConfig.Builder(getApplicationContext(), "YOUR_POP_UNIT_ID")
        .build();
        
final BuzzAdBenefitConfig buzzAdBenefitConfig = new BuzzAdBenefitConfig.Builder(context)
        ...생략...
        .setPopConfig(popConfig)
        .build();
BuzzAdBenefit.init(this, buzzAdBenefitConfig);

new PopNavigator().launchCustomFragment(
    context,
    new CustomInAppLandingInfo(
        new YourFragment(),
        R.stirng.your_title
    )
)

public class YourControlService extends PopControlService {

    @Override
    protected Notification buildForegroundNotification(@NonNull String unitId, @NonNull PopNotificationConfig popNotificationConfig) {
        // Pop을 표시하는 PendingIntent (원형 아이콘ㅇ)
        PendingIntent popPendingIntent = getPopPendingIntent(unitId, this);

        // 필요에 따라 notificationChannel을 등록합니다.
        NotificationCompat.Builder builder;
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            createNotificationChannelIfNeeded();
            builder = new NotificationCompat.Builder(this, NOTIFICATION_CHANNEL_ID);
        } else {
            builder = new NotificationCompat.Builder(this);
        }

        // Pop Service Notification 에 사용할 View 를 등록합니다.
        RemoteViews remoteView = new RemoteViews(getPackageName(), R.layout.view_custom_notification);
        builder.setSmallIcon(popNotificationConfig.getSmallIconResId())
                .setContent(remoteView)
                .setContentIntent(popPendingIntent)
                .setPriority(PRIORITY_LOW)
                .setShowWhen(false);
        if (popNotificationConfig.getColor() == null) {
            builder.setColor(popNotificationConfig.getColor());
        }
        return builder.build();
    }

    @TargetApi(Build.VERSION_CODES.O)
    private void createNotificationChannelIfNeeded() {
        final NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
        if (notificationManager.getNotificationChannel(NOTIFICATION_CHANNEL_ID) == null) {
            final NotificationChannel channel = new NotificationChannel(NOTIFICATION_CHANNEL_ID, NOTIFICATION_CHANNEL_NAME, NotificationManager.IMPORTANCE_LOW);
            channel.setShowBadge(false);
            notificationManager.createNotificationChannel(channel);
        }
    }
}

final PopNotificationConfig popNotificationConfig = new PopNotificationConfig.Builder()
                .notificationId(NOTIFICATION_ID)
                .build();

final PopConfig popConfig = new PopConfig.Builder(getApplicationContext(), UNIT_ID_POP)
        .popNotificationConfig(popNotificationConfig)
        .controlService(YourControlService.class)
        .build();

final BuzzAdBenefitConfig buzzAdBenefitConfig = new BuzzAdBenefitConfig.Builder(context)
        .setPopConfig(popConfig)
        .build();

// AndroidManifest.xml

<application
    ...생략...
    
    <service android:name=".java.YourControlService" />
    
    ...생략...
</application>

public class YourPopToolbarHolder extends DefaultPopToolbarHolder {
    @Override
    public View getView(Activity activity, @NonNull final String unitId) {
        toolbar = new PopToolbar(activity); // PopToolbar 에서 제공하는 기본 Template 사용
        toolbar.setTitle("TemplatePopToolbarHolder"); // 툴바 타이틀 문구를 변경합니다.
        toolbar.setIconResource(R.mipmap.ic_launcher); // 툴바 좌측 아이콘을 변경합니다. 
        toolbar.setBackgroundColor(Color.LTGRAY); // 툴바 배경색을 변경합니다.

        addInquiryMenuItemView(activity, unitId); // 문의하기 버튼은 이 함수를 통해 간단하게 추가 가능합니다.
        addRightMenuItemView1(activity, unitId); // custom 버튼 추가
        return toolbar;
    }

    // custom 버튼 추가는 toolbar.buildPopMenuItemView 를 사용하여 PopMenuImageView 를 생성하고
    // toolbar.addRightMenuButton 를 사용하여 toolbar 에 추가합니다.
    private void addRightMenuItemView1(@NonNull final Activity activity, @NonNull final String unitId) {
        PopMenuImageView menuItemView = toolbar.buildPopMenuItemView(activity, R.mipmap.ic_launcher);
        menuItemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                showInquiry(activity, unitId); // 문의하기 페이지로 연결합니다. 
            }
        });
        toolbar.addRightMenuButton(menuItemView);
    }
}

new PopConfig.Builder(getApplicationContext(), "YOUR_POP_UNIT_ID")
      .feedToolbarHolderClass(YourPopToolbarHolder.class)
      .build();

public class YourPopToolbarHolder extends DefaultPopToolbarHolder {
    @Override
    public View getView(Activity activity, @NonNull final String unitId) {
        // 직접 구성한 layout 을 사용합니다
        ViewGroup root =  (ViewGroup) activity.getLayoutInflater().inflate(R.layout.your_pop_custom_toolbar_layout, null);

        View buttonInquiry = root.findViewById(R.id.yourInquiryButton);
        buttonInquiry.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // 문의하기 페이지 열기
                showInquiry(activity, unitId);
            }
        });
        return root;
    }
}

new PopConfig.Builder(getApplicationContext(), "YOUR_POP_UNIT_ID")
      .feedToolbarHolderClass(YourPopToolbarHolder.class)
      .build();

public final class CustomPopUtilityLayoutHandler extends PopUtilityLayoutHandler {

    private Context context;

    public CustomPopUtilityLayoutHandler(Context context) {
        super(context);
        this.context = context;
    }

    @Override
    public void onLayoutCreated(ViewGroup parent) {
        LayoutInflater inflater = LayoutInflater.from(context);
        final FrameLayout layout = (FrameLayout) inflater.inflate(
                R.layout.your_pop_utility_view,
                parent,
                false
        );
        parent.addView(layout);
    }
}
new PopConfig.Builder(getApplicationContext(), "YOUR_POP_UNIT_ID")
      .popUtilityLayoutHandlerClass(CustomPopUtilityLayoutHandler.class)
      .build();

PopConfig popConfig = new PopConfig.Builder(context, "YOUR_POP_UNIT_ID")
      .popExitUnitId("YOUR_POP_EXIT_UNIT_ID")
      .build();