# Composition
![Systemübersicht](_diagrams/invoices-overview.svg)

Hitobito's invoice feature can be used to issue invoices to individuals and companies.

* **Invoice:** Simple invoice with one or more items. Can be created for a person, an event, a group or via subscription
* **Letter:** A simple letter, without invoice part. Is created via the subscription. See [Messages](../messages/README.md).
* **Invoice letter:** A letter combined with an invoice. Is created via the subscription.

QR invoices can be tested in a simple way with https://www.swiss-qr-invoice.org.
