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

# Sandbox and go-live

> How to test and prepare for production safely.

## Sandbox checklist

Before go-live, you should manually test and validate:

* operation creation, completion, and voiding
* split tender payloads
* returns against prior sale
* parsing and printing the fiscal information
* offline queue replay

## Important Implementation Checks

1. Correctly setting `Idempotency-Key` on retries.
2. Correctly setting `X-OpenFiskal-Merchant` on all merchant-scoped requests.
3. Every operation writer persists and reuses the latest `ETag`

## Next steps

* [Getting started](/getting-started)