# POS+ API

Start using the POS+ API to process payments from your Castles device.

Integration
Integrate with the POS+ API to process payments directly from your Castles device.

Manage POS devices
Activate, configure, and update your device.

Initiate POS transactions
Process an in-person card payment.

Modify POS transactions
Update a previously initiated transaction.

Generate receipts
Learn how to generate compliant transaction receipts.