This guide shows the fastest, error-free way to make and manage invoices from appointments, Patient360, or Financials, explaining when invoices link automatically versus needing manual linking. It walks through choosing patient, date, location, adding services/products, adjusting quantities/prices, applying discounts, and setting payment/installment terms (including manual splits and due dates). Follow it to avoid mistakes, ensure correct billing linkage, and provide clear payment instructions for patients.