final PushDialogConfig pushDialogConfig = new PushDialogConfig.Builder()
                .colorConfirm(R.color.colorAccent)
                .colorCancel(R.color.colorPrimary)
                .imageRegisterLogo(R.drawable.benefit_push_dialog_image_logo)
                .imageUnregisterLogo(R.drawable.benefit_push_dialog_image_logo)
                .build();

public class CustomNotificationWorker extends NotificationWorker {
    @Override
    @NonNull
    public NotificationConfig getNotificationConfig() {
        return new NotificationConfig.Builder()
            .iconResourceId(...)
            .build();
    }
}