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# Introduction to POS API

The POS APIs are meant to allow a wide range of use cases, including:

* Custom UI for themed unattended POS that only uses the backend for business logic.
* Custom UI for QR selfservice POS apps that only uses the backend for business logic.
* Custom UI for customer facing displays that show newly added lines in real time.
* Looking up finished sales, known as POS entries.
* Looking up and creating new POS Units.