The steps.
Send the invoice to the customer and confirm the saved customer has an email address.
Open the invoice reminder controls and choose seven days before its due date, on the due date, or seven days after.
Review unpaid invoices and mark confirmed payments Paid. You can also send a reminder manually from the invoice controls.
Before you finish.
These are three optional reminder events, not an indefinite chase sequence. Provider acceptance does not guarantee delivery to the recipient’s inbox.