If you want to wait until a Sale is at least a month old or older before you payout commissions, or in case people do refunds, you can just search for invoices that have a start date that is at least one month old.
Step 1. From the Admin Dashboard, click on "Rewards".
Step 2. Under "Manage Invoices", click on "Search Invoices".
Step 3. Select the Invoice Start Date & End Date, click "Search".
Step 4. Once the results are displayed, you can do the Commission payouts.