Window to Add to or Modify an Existing Invoice
When can I add invoice items to an invoice or change an invoice that's been created?
You can modify an invoice after the invoice has been created and is in
draft status. A newly-generated invoice remains in
draft status for an hour after it’s been created.
The best way to monitor the creation and status of an invoice is by setting up webhooks to listen for
closed==false. Invoices that are no longer in
draft status and have been finalized will reflect
closed==true and can no longer be changed.
When an invoice is out of
draft status, any new invoice items that are created will be applied to the next invoice.
If you are looking to add a one-time item to a customer’s first invoice, such as a setup fee, see: Charge a one-time setup fee with a subscription plan.