...
https://support.yourpayroll.zendeskcom.comau/hc/en-gbau/articles/208014326-KeyPay-Getting-Started-Guide-V1-1
Processing payroll by importing into bank payments
Setting up Opening Balances for each Employee
https://support.yourpayroll.zendeskcom.comau/hc/en-gbau/articles/200077455-Setting-Employee205237614-Opening-Balances-Initial-Values-Settings