You can manually send the payment reminders for the outstanding invoices. This is possible by getting into the invoice details page of the overdue invoices.

You can also set automated reminders for the Overdue Invoices. For example, if you need to set an automated reminder after 7 days of overdue for an 'Unpaid' invoice, you can follow the steps given below:

• Click the Settings tab.
• Click the Payment Reminders sub-link under Payment Settings.
• Click the 'edit this reminder' link under the 'Automated Reminders'." (under Discount).
• Select the following options:
  • Send This Reminder > "After due date"
  • When To Remind? > "7 day(s) after due date"
  • Whom To Remind? > "Remind Customer"
• Scroll down the page and click the Save button.