> ## Documentation Index
> Fetch the complete documentation index at: https://loyalty-interchange.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Restaurant checkout and refunds

> Map payment outcomes to evaluate, reserve, accrue, capture, reverse, and refund-safe adjustment.

The merchant BFF owns orchestration because it is the only layer that should
see both the authenticated customer and the merchant loyalty key.

<Steps>
  <Step title="Preview">Map the open cart and call `orders/evaluate`; reserve a selected reward before payment.</Step>
  <Step title="Resolve payment">Reverse on failure. On settled payment, map the paid order and post accrual with the original operation key.</Step>
  <Step title="Finalize reward">Capture the reservation against the paid order. Retry a failed operation with its original key.</Step>
  <Step title="Adjust">Post a void or partial-refund adjustment linked to the original order with exact signed deltas.</Step>
</Steps>

Decide before launch whether tax, tip, service fees, gift value, comps, and
delivery charges earn. Keep store-local `business_date` separate from event
timestamps. Partial refunds reverse only earning/funding attributable to the
returned amount; they are not synthetic negative purchases.

See the runnable [ordering BFF on GitHub](https://github.com/craveup/opensource-loyalty/blob/main/examples/typescript/ordering-bff.ts).