text: //
  //  preview_notification_service.h
  //  spark-ios-sdk
  //
  //  Created by volodymyr on 16/02/2018.
  //  Copyright © 2018 Hola. All rights reserved.
  //
  
  #import <UserNotifications/UserNotifications.h>
  
  // notification service interface defined in export header
  #import "spark_api.h"
  