Option Name Description Data Type portal_invoice_payment_overdue_interval Days between overdue email sends Integer (default: 7) portal_invoice_payment_overdue_stop_days Maximum days after due date to send overdue emails Integer (0 = no limit, default: 0) portal_invoice_payment_overdue_stop_emails Maximum overdue emails to send per invoice Integer (0 = no limit, default: 0) portal_invoice_payment_overdue_send_time Time of day to send overdue emails (HH:MM format) String (e.g., \"08:00\") portal_invoice_payment_overdue_email_subject Subject line template with placeholders String (text only) portal_invoice_payment_overdue_email_body Email body template with HTML and placeholders String (HTML allowed) Meta Key Description Related To _invoice_client_name Customer name for {customer_name}