The text extracted from a WA Health PDF payslip contains the following block with your leave balances:
...
Leave Type Balance Calculated
ANNUAL LEAVE 1.23 W
MED PRACT AL ADDIT LVE 99.00 H
LONG SERVICE LEAVE 0.00 W
PROF DEV LV ACCRUING 3.02 H
SICK LEAVE - FULL PAY 111.11 H
TOIL PUBLIC HOLIDAY 0.00 H
...
extractLeaveBalances.py will process all PDFs in the working directory and generate an Excel spreadsheet (output.xlsx) with balances for each leave type for each pay period. The period end date is also recorded for convenience.
Don't feed it anything other than payslips.