public interface CustomPushRender {
    /**
     * @return: Return true if notification is rendered successfully, else return false.
     */
    boolean onRender(Context context, PushNotificationData pushNotificationData);
}

public interface CustomPushRerender {
    /**
     * @return: Return true if notification is re-rendered successfully, else return false.
     */
    boolean onRerender(Context context, PushNotificationData pushNotificationData, Bundle extras);
}

boolean autoCancel = true;  // true if notification should be dismissed on click, else false
    PendingIntent contentPendingIntent = PendingIntentFactory.constructPushClickPendingIntent(context, pushNotificationData, pushNotificationData.getPrimeCallToAction(), autoCancel);
    NotificationCompat.Builder builder = new NotificationCompat.Builder(context, MY_CHANNEL_ID)
        ...
        .setContentIntent(contentPendingIntent)
        ...

PendingIntent deletePendingIntent = PendingIntentFactory.constructPushDeletePendingIntent(context, pushNotificationData);
    NotificationCompat.Builder builder = new NotificationCompat.Builder(context, MY_CHANNEL_ID)
        ...
        .setDeleteIntent(deletePendingIntent)
        ...

...
    int requestCode = (requestCodePrefix + pushNotificationData.getVariationId()).hashCode();
    PendingIntent pendingIntent = PendingIntent.getService(context, requestCode, intent, PendingIntent.FLAG_UPDATE_CURRENT);
    return pendingIntent;

Bundle rateClickExtraData = new Bundle();
    rateClickExtraData.putInt("current", i);
    ...

    PendingIntent rateClickPendingIntent = PendingIntentFactory.constructRerenderPendingIntent(context, pushNotificationData, "rate_click_" + i, rateClickExtraData);
    ratingView.setOnClickPendingIntent(R.id.selected_star, rateClickPendingIntent);

int currIndex = 0;
    PendingIntent leftPendingIntent = PendingIntentFactory.constructCarouselBrowsePendingIntent(context, pushNotificationData, currIndex, "left", "carousel_left", browseExtraData);
    PendingIntent rightPendingIntent = PendingIntentFactory.constructCarouselBrowsePendingIntent(context, pushNotificationData, currIndex, "right", "carousel_right", browseExtraData);
    ...
    carouselView.setOnClickPendingIntent(R.id.left_arraow, leftPendingIntent);
    carouselView.setOnClickPendingIntent(R.id.right_arrow, rightPendingIntent);
    ...

int currIndex = extraData.getInt("current");  // current index can be obtained from extraData bundle provided while setting Click PendingIntent
    PendingIntent rateSubmitPendingIntent = PendingIntentFactory.constructPushRatingSubmitPendingIntent(context, pushNotificationData, currIndex);
    ratingView.setOnClickPendingIntent(R.id.rating_submit_button, rateSubmitPendingIntent);

public class MyPushRenderer implements CustomPushRender, CustomPushRerender {
    @Override
    public boolean onRender(Context context, PushNotificationData pushNotificationData) {
        // render your notification here
        return true;
    }

    @Override
    public boolean onRerender(Context context, PushNotificationData pushNotificationData, Bundle bundle) {
        // re-render your notification here
        return true;
    }
}

public class MainApplication extends Application {
    private static final String TAG = MainApplication.class.getSimpleName();

    @Override
    public void onCreate() {
        super.onCreate();

        ...

        // Register for custom push render callbacks
        MyPushRenderer myPushRenderer = new MyPushRenderer();
        WebEngage.registerCustomPushRenderCallback(myPushRenderer);
        WebEngage.registerCustomPushRerenderCallback(myPushRenderer);
    }
}

@Override
    public PushNotificationData onPushNotificationReceived(Context context, PushNotificationData notificationData) {
        notificationData.setTitle("YOUR_TITLE"); // Add or change title
        notificationData.setContentText("YOUR_MESSAGE"); // Change message
        WebEngageConstant.STYLE style = notificationData.getStyle();
        if (style != null) {
            switch (style) {
                case BIG_PICTURE:
                    // Change image
                    notificationData.getBigPictureStyleData().setBigPictureUrl("http://www.example.com");

                    //Add title which will be shown when notification is expanded
                    notificationData.getBigPictureStyleData().setBigContentTitle("YOUR_EXPANDED_TITLE");
                    // Add summary which will be shown when notification is expanded.
                    notificationData.getBigPictureStyleData().setSummary("YOUR_SUMMARY");
                    break;

                case BIG_TEXT:
                    // Add or change title which will be shown when notification is expanded.
                    notificationData.getBigTextStyleData().setBigContentTitle("YOUR_EXPANDED_TITLE");
                    // Change message which will be shown when notification is expanded.
                    notificationData.getBigTextStyleData().setBigText("YOUR_EXPANDED_MESSAGE");
                    break;
            }
        }
        return notificationData;
    }

@Override
public void onPushNotificationDismissed(Context context, PushNotificationData notificationData) {
    Bundle customData = notificationData.getCustomData();
    if (customData != null) {
            // Your customization logic goes here
    }
}

@Override
public boolean onPushNotificationClicked(Context context, PushNotificationData notificationData) {
        return buildNavigation(context, notificationData.getPrimeCallToAction());
    }

@Override
public boolean onPushNotificationActionClicked(Context context, PushNotificationData notificationData, String buttonID) {
        return buildNavigation(context, notificationData.getCallToActionById(buttonID));
    }

    private boolean buildNavigation(Context context, CallToAction callToAction) {
        if (callToAction != null) {
            if (callToAction.isPrimeAction()) {
                //User clicked on notification content
                String action = callToAction.getAction();
                if (action == null) {
                    // Primary CTA was not configured with a URI or deep link.
                    // Return false if you want WebEngage SDK to open launcher activity with default intent flags.
                    // Return true and write your own code to open desired activity with custom intent flags.


                } else {
                    CallToAction.TYPE type = callToAction.getType();
                    if (type != null) {
                        switch (type) {
                            case LINK:
                                //This CTA was configured with a link while creating the push notification campaign.
                                // This link can be either an http url or your custom deep link.
                                // Return false if you want WebEngage SDK to open this link with default flags or return true
                                // and write your own code to open this link.

                                break;


                            case LAUNCH_ACTIVITY:
                                //This CTA was configured with an activity path while creating the push notification.
                                // Return false if you want WebEngage SDK to open this activity with default flags or return true 
                                // and write your own code to open this activity.

                                break;
                        }
                    }
                }
                //NOTE: To get action string use callToAction.getAction()
            } else {
                // User clicked on one of the action buttons.
                // Handle this CTA in the same way above primary CTA is handled, if only desired.
            }
        }
        return false;
    }