Sometimes you need to resend an invoice to reminder a customer it is still due, or because they ask you to resend it. You can resend an invoice through the ecommerce control panel.
To begin hover over sell online click on invoices, locate the specific invoice, and click on the invoice number. On the details section there is a resend invoice button. It remembers the email you sent the invoice to when it was created, however you have the option to edit the email as well.