In my view, and it is no more than that, the answer will depend to some degree on what the payments are.
A parish council cannot commit to expenditure unless the item is on the agenda and the public have add the three clear days notice as you say. Hence a decision, for example, to buy a new park bench, shall we say, can only be passed with the requisite notice having been given. However, approval to pay the bill for the new park bench once it has been delivered need not be noticed because the expenditure was incurred when the council resolved to buy it. All that is being done now is to pay an outstanding account. Similarly, accounts re: electricity and hall rental etc. have probably already been committed to by the council.
However the best option would seem to be to publish the list of payments prior to the meeting.