code: private static void applyDefaults(Delivery.Builder builder){
          Stamp defaults = getPostman().defaultStamp;
          if(defaults != null){
              builder.setDesign(defaults.getDesign())
                     .setCancelable(defaults.isCancelable())
                     .setCanceledOnTouchOutside(defaults.isCanceledOnTouchOutside())
                     .setIcon(defaults.getIcon())
                     .setThemeColor(defaults.getThemeColor())
                     .showKeyboardOnDisplay(defaults.isShowKeyboardOnDisplay());
          }
      }
docs: If possible, apply the default stamp to this outgoing delivery
  
  @param builder       the delivery builder to apply defaults to