I can help you generate the report that you need, @Constdan91.

Here's how to run this report: 

1. Go to the Reports menu and click on Customer & Receivables.
2. Select Open Invoices. 
3. Click on the Customize Report button to add the amount, payments made and discount.
4. On the page that appears, go to the Display tab. 
5. On the Columns section search for Amount, Amount Paid and Discount Available.
6. Once done, click the Excel drop-down arrow at the top of the report to export it to Microsoft Excel.

Check this article for more information about this report: A paid bill or invoice shows on report or window of open transactions.

Here's more information on how to customize any report that you generate: Customize reports in QuickBooks Desktop. 

I'm always here if you need more help in getting the report that you need and or anything else. Have a wonderful day!