Once you've sent an invoice from the app, you can still manage it. Right from the invoice you can:
- Send reminder: nudge a customer who hasn't paid yet.
- Void invoice: cancel it if it's no longer needed.
To edit an invoice's details (line items, amount, due date), log in to your Stripe Dashboard on the web. That's where field-level changes are made.
When creating an invoice, the required fields are the customer's email, a description, the amount (a single amount, or line items / one-time Stripe Products and tax), and the days until due.