/// <summary>
        /// A basic add example
        /// </summary>
        /// <param name="orgCode">Organization Code</param>
        /// <param name="orderNumber">The order number of the item's parent order</param>
        /// <param name="unitValue">The amount of items you want on the order</param>
        /// <param name="resource">This should be filled in as the Price List Sequence number (CC716_SEQ) of the item you wish to add.  It should belong to the Order's price list items (Check CC716_PRICE_LIST_DTL).</param>
        public MembershipOrderItemsModel Add(string orgCode, int orderNumber, int unitValue, string resource)
        {
            var myMembershipOrderItems = new MembershipOrderItemsModel
            {
                OrganizationCode = orgCode,
                Units            = unitValue,
                OrderNumber      = orderNumber,
                Resource         = resource,
                StartDate        = System.DateTime.Now,
                EndDate          = System.DateTime.Now.AddDays(1)
            };

            return(APIUtil.AddMembershipOrderItem(USISDKClient, myMembershipOrderItems));
        }