One file per month: PropNex → commission received, exported for the previous month's payout window. Every payout row is stored in the received ledger (dedup by Pay Voucher — overlapping windows are safe), and a deal flips to Paid as soon as any money is received — installments count from the first payment, and the ledger keeps tracking cumulative received vs share. Run the Monthly Submissions import first so Transaction Nos are stamped.