`invoice.status` already supports `'partial'`, but there is **no UI** to collect a partial / installment payment at checkout. **Scope:** a partial-payment collection flow on the checkout surface (amount entry, remaining-balance display, receipt).
invoice.statusalready supports'partial', but there is no UI to collect a partial / installment payment at checkout.Scope: a partial-payment collection flow on the checkout surface (amount entry, remaining-balance display, receipt).