Banks prefer to shift to periodic, though more frequent, payments for the bulk of their customer base in preference to any shift to "real time" payments, submissions to the RBA's innovation review show.The Australian Payments Clearing Association wrote that "when presented with an option of intraday or real-time low value settlement, APCA members have expressed a preference for intraday settlement over real time settlement. "Members seek to manage their liquidity needs and particularly value the continuation of the batching facility within the low value settlement stream."Our members believe that the cost associated with real time settlement for low value payments far outweighs the benefits."Several banks said that they either already were, or could, make more frequent credit payments to customer accounts, for instance in relation to purchases for merchants.A key issue for banks in any talk of adopting real time payments - at any time of the day and any day of the week - are the practicalities of managing liquidity, for example, at weekends when the money markets are closed.