/// <summary>
 /// Gets all subscribtions for given push request.
 /// </summary>
 /// <param name="pushRequestSubscriptionManager">Push request subscription manager</param>
 /// <param name="tenantId">Tenant id. Null for the host.</param>
 /// <param name="pushRequestName">Name of the push request.</param>
 /// <param name="entityIdentifier">entity identifier</param>
 public static List <PushRequestSubscription> GetSubscriptions(this IPushRequestSubscriptionManager pushRequestSubscriptionManager, int?tenantId, string pushRequestName, EntityIdentifier entityIdentifier = null, int skipCount = 0, int maxResultCount = int.MaxValue)
 {
     return(AsyncHelper.RunSync(() => pushRequestSubscriptionManager.GetSubscriptionsAsync(tenantId, pushRequestName, entityIdentifier, skipCount, maxResultCount)));
 }