Option Name Description Data Type portal_invoice_payment_reminder_rules Array of days before due date for reminders Array of integers portal_invoice_payment_reminder_send_time Time of day to send reminders (HH:MM format) String (e.g., "09:00") portal_invoice_payment_reminder_email_subject Subject line template with placeholders String (text only) portal_invoice_payment_reminder_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} placeholder Invoice _invoice_client_email Customer email for sending reminder Invoice _invoice_number Invoice number for {invoice_number} placeholder Invoice _invoice_total Total amount for {amount_due} placeholder Invoice _invoice_due_date Due date