/// <summary>
        /// The add subscription.
        /// </summary>
        /// <param name="content">
        /// The content.
        /// </param>
        /// <returns>
        /// The <see cref="bool"/>.
        /// </returns>
        private bool AddSubscription(string content)
        {
            Subscription subscription;
            try
            {
                subscription = JsonConvert.DeserializeObject<Subscription>(content);
            }
            catch (Exception exception)
            {
                return false;
            }

            var store = new SubscriptionStore();

            if (store.GetSubsriptions().Any(s => s.Id == subscription.Id))
            {
                return false;
            }

            store.AddSubscription(subscription);

            return true;
        }