You may want to see a list or Excel report for registrants who have not yet paid.

To get there:

Login to the Wizevents admin backend.

Click on the second icon, "attendees", located adjacent to your event. 

What to do:

To download a report, choose "Export Registrant Data INCLUDING Survey Questions/Answers"

Under the Payment Status heading, click on the "Only Registration with Outstanding Balance" option. 
You can then select which ticket types to include, or select "All Tickets" to export all registration transaction data. You can also simply click on the "Export Report" button toward the bottom for the complete registration information. An Excel spreadsheet will begin to download.

To view the names in a list, click on "Manage Registrants". 

Next to the Last Name field, you can click on the dropdown menu and select "Outstanding Balances" instead of "All Payment Status" and then click Find Now.