How do I see a customer's statement?

The statement lists every invoice, payment, refund and credit note on the customer's account with a running balance on each line, so a total can be checked down the page rather than trusted at the bottom, and it opens on everything you hold for them with a From date if you only want a period. Choose an earlier To date and every figure on the page, including the open invoices and Total due, is as of that date; an invoice paid since says so. The opening balance is its own line, not a footnote. Only money moves the balance: a payment made from the customer's account credit is shown as a line of explanation, since the overpayment that created the credit was already counted, and a credit refunded to them as money is shown as money going back. It is a screen you read and show; it does not email itself to the customer, and there is no send button on it.