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

# Application Fee

> A disclosed Connect-app fee or subsidy added after Darwin returns the network quote.

A Connect application may add a fixed or percentage Application fee after Darwin returns its network quote. It may instead subsidize part of the customer total from its operational balance.

Darwin controls the minimum network economics. The app controls only its pricing overlay.

An approved overlay records:

* Fixed amount or percentage
* Optional application-funded subsidy
* Customer total
* Refund policy: full, proportional, or nonrefundable
* Collection mode
* Quote version and maximum authorization

The overlay becomes immutable after customer approval. Any increase requires a new approval. Darwin records earnings, subsidies, refunds, reversals, and payouts as immutable application-ledger entries.

<Note>
  Application-fee quoting, settlement, and payout are preview. Do not represent them as production API capabilities until their operations and events appear in the Connect API reference.
</Note>

<Card title="Withdraw Application Fee Earnings" href="/connect/workflows/withdraw-application-fee-earnings">
  Review the planned owner-controlled payout workflow.
</Card>