/// <summary>
 /// Subscribes to all available push requests for given user.
 /// It does not subscribe entity related push requests.
 /// </summary>
 /// <param name="pushRequestSubscriptionManager">Push request subscription manager</param>
 /// <param name="user">User.</param>
 public static void SubscribeToAllAvailablePushRequests(this IPushRequestSubscriptionManager pushRequestSubscriptionManager, IUserIdentifier user)
 {
     AsyncHelper.RunSync(() => pushRequestSubscriptionManager.SubscribeToAllAvailablePushRequestsAsync(user));
 }