The Email Invoice endpoint extends the Trace AR Checkout suite by allowing integrators to generate payment requests directly to a customer's inbox, encompassing financial details, customer identification, and specific transaction behavior. It also allows for control over the checkout experience by defining how the payer can interact with the invoice, and manages the lifecycle of the invoiceusing an expiration timestamp. This feature provides a cohesive visual identity for merchant invoices, containing a secure link that seamlessly transitions the recipient to the hosted payment interface to complete their transaction.