protected virtual async Task <IPagedList <Subscription> > InnerSearchSubscriptionsAsync(SubscriptionSearchCriteria criteria, WorkContext workContext)
        {
            if (criteria == null)
            {
                throw new ArgumentNullException(nameof(criteria));
            }
            var result = await _subscriptionApi.SearchSubscriptionsAsync(criteria.ToSearchCriteriaDto());

            return(new StaticPagedList <Subscription>(result.Subscriptions.Select(x => x.ToSubscription(workContext.AllCurrencies, workContext.CurrentLanguage)),
                                                      criteria.PageNumber, criteria.PageSize, result.TotalCount.Value));
        }
        public async Task <IPagedList <Subscription> > SearchSubscriptionsAsync(SubscriptionSearchCriteria criteria)
        {
            var workContext = _workContextAccessor.WorkContext;
            var cacheKey    = CacheKey.With(GetType(), "SearchSubscription", criteria.GetCacheKey());

            return(await _memoryCache.GetOrCreateExclusiveAsync(cacheKey, async (cacheEntry) =>
            {
                //Observe all subscriptions for current user and invalidate them in cache if any changed (one limitation - this toke doesn't detect subscriptions deletions)
                cacheEntry.AddExpirationToken(new PollingApiSubscriptionsChangeToken(_subscriptionApi, _options.ChangesPollingInterval));
                cacheEntry.AddExpirationToken(SubscriptionCacheRegion.CreateCustomerSubscriptionChangeToken(criteria.CustomerId));
                var result = await _subscriptionApi.SearchSubscriptionsAsync(criteria.ToSearchCriteriaDto());
                return new StaticPagedList <Subscription>(result.Subscriptions.Select(x => x.ToSubscription(workContext.AllCurrencies, workContext.CurrentLanguage)),
                                                          criteria.PageNumber, criteria.PageSize, result.TotalCount.Value);
            }));
        }