Extracting the list of customers who placed an order with a specific discount voucher

In Store Commander interface, you will find a panel dedicated to Discount Vouchers (cart rules) under Orders menu, where you can for instance view and extract the list of customers and their orders that used a specific discount voucher.

In this window, you can see the details of all cart rules you might have created in your PrestaShop backoffice:

On the right handside column, open the Order details panel to display the list of customers and their orders that used the selected discount voucher.
You then only need to export this list using the quick export option to obtain the customer contact details on a spreadsheet.