public ActionResult <List <TransactionModel> > Transactions([FromHeader] HoldingsInputModel userData)
        {
            var transactions = _transactionQueryService.GetTransactions(userData.userId);

            var mappedTransactions = _mapper.Map <List <TransactionModel> >(transactions);

            return(Ok(mappedTransactions));
        }
        public async Task <ActionResult <TotalHoldingsModel> > Holdings([FromHeader] HoldingsInputModel userData)
        {
            var holdings = await _holdingsService.GetHoldings(userData.userId);

            var mappedHoldings = _mapper.Map <TotalHoldingsModel>(holdings);

            return(Ok(mappedHoldings));
        }