Software: QuickBooks accounting software
To view those paid sales invoices by Rep (Salesperson), you can use the Sales by Rep Detail report with a little modification to show the Paid column.
From the Sales by Rep Detail report, click the Customize Report button, and check the Paid field from the Columns section of the Display tab.
You can further filter the Paid Status (either Closed or Open) of the Sales by Rep Detail report to show only Paid or Unpaid invoices.
This report may help those businesses who pay sales commission based on paid invoices.