> ## Documentation Index
> Fetch the complete documentation index at: https://devzone.nayax.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Additional Resources

This section provides supplementary resources, detailed technical data, and common troubleshooting information to aid integrators in their work with the Nayax Spark API. These pages give you quick access to facts, definitions, and code examples that complement the main documentation flows and guides.

## Available Guides

<CardGroup cols={3}>
  <Card icon="id-badge" title="Closed Loop Card Support" href="/docs/integrate-pos-device/spark/additional-resources/smc-support">
    Use closed-loop cards, such as RFID tags or loyalty cards, in Spark's start and stop flows.
  </Card>

  <Card icon="display" title="PosDisplay Format" href="/docs/integrate-pos-device/spark/additional-resources/spark-posdisplay-format">
    Format data so it displays correctly on the terminal screen.
  </Card>

  <Card icon="receipt" title="eReceiptData Format" href="/docs/integrate-pos-device/spark/additional-resources/spark-ereceiptdata-format">
    Structure transaction data for the eReceiptData field on digital receipts.
  </Card>

  <Card icon="list-check" title="Response Codes" href="/docs/integrate-pos-device/spark/additional-resources/spark-response-codes">
    Look up response codes and the API methods that return them.
  </Card>
</CardGroup>