private IEnumerable<ParseObject> UpdateDuplicateRecordsInternal(ref Purchase[] userCoupons)
        {
            var duplicateCoupons = userCoupons.Where(x => x.BundleKey != null)
                .GroupBy(x => x.BundleKey.ObjectId)
                .Where(x => x.Count() > 1)
                .Union(userCoupons.Where(x => x.ClipKey != null).GroupBy(x => x.ClipKey.ObjectId).Where(x => x.Count() > 1));

            var updateObjects = new List<ParseObject>();
            foreach (var duplicateCouponList in duplicateCoupons)
            {
                var couponsToUpdate = duplicateCouponList.Except(new[] { duplicateCouponList.Last() }).ToArray();
                couponsToUpdate.ForEach(x => x.PurchaseStatusCode = BL.Consts.CouponStatus.WasDuplicate);

                userCoupons = userCoupons.Except(couponsToUpdate).ToArray();
                updateObjects.AddRange(couponsToUpdate);
            }
            return updateObjects;
        }