Sending Payment Due Reminders Automatically

You can email payment due reminders to your customers. The emails start before the payment terms period expires, based on the set number of days defined here. In the Payment due schedule section, there are two notices to email and templates to choose for each one. 

1. Go to Settings  > Configurations.
2. In the Dunning preferences section, click Manage.
3. Go to the Payment due reminders section.
4. In the Days before field, enter the number of days before the invoice is due to send an email notice.
5. Click add another to display additional email notices.
6. Click Save.