An order brings its invoice with it, with the lines, coupon and total from checkout. You can also create one from Invoices → New invoice: choose a client (or enter one), add line items, and tick Recurring for a repeating charge.
- Numbering: your prefix, then the client, then a number in that client's own sequence, for example
INV-0001/0007. - Statuses: Unpaid, Paid, Overdue, Partially Paid, Payment Pending, Refunded, Void and Abandoned. When a client pays you, mark the invoice paid; its History records it.
- PDF: clients open the invoice in their portal or use Download PDF, under your logo.