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

# Connect the Fees Engine to Midaz

> Configure the embedded Fees Engine with the Midaz ledger.

Fees runs inside the unified Midaz ledger process. Configure it in the ledger deployment; it is neither a separate service nor a plugin.

## Configuration

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Configure its MongoDB storage with `MONGO_FEES_*` settings in the Midaz deployment. `DEFAULT_CURRENCY` is optional and defaults to `USD` when unset. See [Midaz environment variables](/en/midaz/midaz-environment-variables) for ledger configuration.

## See it in Lerian

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* The full integration journey across the pieces: [Building a complete core banking](/en/building-a-complete-core-banking)
* What the Fees Engine does: [What is Fees Engine?](/en/midaz/fees/fees-engine-overview)
* Deploy the stack: [Helm charts](/en/platform/helm/helm-overview)