To view the Invoices for a Customer, first open Accounts from the Navigation menu and find the Customer whose payment you want to refund:
Select the Billing tab and Click on Invoices in the navigation list to view all Invoices for this customer:
The Invocies for this customer will be displayed. All Invoices will be displayed in Groups based on their status:
Unpaid
Refunded
Disregarded
Credited
Paid
For all Invoices you can click on the PDF icon under 'Invoice' to open the Invoice as a PDF
For any Unpaid Invoices you can manually retry them with the Retry button:
A confirmation window will appear detailing the Amount that will be attempted:
This will attempt to take payment for that Invoice immediately and will give you a success or failure message on screen: