There is currently not a way to export invoices for a single customer. As a workaround, export all the invoices and then sort by customer name.
- Navigate to Admin > Reports.
- In the Invoices section, click Invoice Export.
- It will bring you to the File Downloads screen. You will need to refresh the screen after a few minutes to see the file.
- Click daily_invoices_report.csv to download it.
- Open the report in a spreadsheet program and sort by last name, then first name.