/// <summary>
/// Subscribes to a push request.
/// </summary>
/// <param name="pushRequestSubscriptionManager">Push request subscription manager</param>
/// <param name="user">User.</param>
/// <param name="pushRequestName">Name of the push request.</param>
/// <param name="entityIdentifier">entity identifier</param>
public static void Subscribe(this IPushRequestSubscriptionManager pushRequestSubscriptionManager, IUserIdentifier user, string pushRequestName, EntityIdentifier entityIdentifier = null)
{
AsyncHelper.RunSync(() => pushRequestSubscriptionManager.SubscribeAsync(user, pushRequestName, entityIdentifier));
}
