How are invoices affected if I update a customer’s information?
Changes will not appear on previous invoices. Invoices reflect historical financial information and generally are not modified after they are settled. If you need to provide an updated invoice to your customer, you may download a text, HTML, or PDF version and edit it locally before sending it to the customer.
Is the design or layout of the invoice customizable?
Unfortunately, the design and layout of the invoice are not customizable.