internal static void UpdateSubscriptionItem(IMundiAPIClient client, string subscriptionId, string subscriptionItemId)
        {
            var request = SubscriptionBuilders.BuildUpdateSubscriptionItemRequest();

            try {
                var response = client.Subscriptions.UpdateSubscriptionItem(subscriptionId, subscriptionItemId, request);
                FileHelper.SaveResponse(response, "UpdateSubscriptionItem");
            }
            catch (ErrorException e) {
                FileHelper.SaveApiError(e, "UpdateSubscriptionItem");
            }
            catch (Exception e) {
                FileHelper.SaveException(e, "UpdateSubscriptionItem");
            }
        }
        internal static void CreateDiscountOnItem(IMundiAPIClient client, string subscriptionId, string subscriptionItemId)
        {
            var request = SubscriptionBuilders.BuildCreateDiscountOnItemRequest(subscriptionItemId);

            try {
                var response = client.Subscriptions.CreateDiscount(request, subscriptionId);
                FileHelper.SaveResponse(response, "CreateDiscountOnItem");
            }
            catch (ErrorException e) {
                FileHelper.SaveApiError(e, "CreateDiscountOnItem");
            }
            catch (Exception e) {
                FileHelper.SaveException(e, "CreateDiscountOnItem");
            }
        }
        internal static string CreateSubscriptionItem(IMundiAPIClient client, string subscriptionId)
        {
            var request = SubscriptionBuilders.BuildCreateSubscriptionItemRequest();

            try {
                var response = client.Subscriptions.CreateSubscriptionItem(request, subscriptionId);
                FileHelper.SaveResponse(response, "CreateSubscriptionItem");
                return(response.Id);
            }
            catch (ErrorException e) {
                FileHelper.SaveApiError(e, "CreateSubscriptionItem");
                return(null);
            }
            catch (Exception e) {
                FileHelper.SaveException(e, "CreateSubscriptionItem");
                return(null);
            }
        }
        internal static string CreateSubscriptionByPlan(IMundiAPIClient client)
        {
            var planId  = PlansClient.CreatePlan(client);
            var request = SubscriptionBuilders.BuildCreateSubscriptionByPlanRequest(planId);

            try {
                var response = client.Subscriptions.CreateSubscription(request);
                FileHelper.SaveResponse(response, "CreateSubscriptionByPlan");
                return(response.Id);
            }
            catch (ErrorException e) {
                FileHelper.SaveApiError(e, "CreateSubscriptionByPlan");
                return(null);
            }
            catch (Exception e) {
                FileHelper.SaveException(e, "CreateSubscriptionByPlan");
                return(null);
            }
        }