Invoice Items represent the component lines of an invoice. When you create an invoice item with an invoice field, it is attached to the specified invoice and included as an invoice line item within invoice.lines.
Invoice Items can be created before you are ready to actually send the invoice. This can be particularly useful when combined with a subscription. Sometimes you want to add a charge or credit to a customer, but actually charge or credit the customer’s card only at the end of a regular billing cycle. This is useful for combining several charges (to minimize per-transaction fees), or for having Stripe tabulate your usage-based billing totals.
Related guides: Integrate with the Invoicing API, Subscription Invoices.