> ## Documentation Index
> Fetch the complete documentation index at: https://nayax-44d6e37b-fis-cortina.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Single Sale

> How Register works in the 1-step Pre-Selection flow, where the price is known at card presentation.

The product price is known at card presentation and the payment is processed in a single Sale call. `Register` fires immediately after Sale approval, **before the product is dispensed**.

## Flow

The following sequence shows how `Register` fits into the single sale flow:

1. Consumer presents a card and selects a product at a known price
2. Nayax Engine processes the Sale via the Payment Provider
3. Nayax Engine sends `POST /FisCortina/Register` to your server
4. Your server registers the transaction and returns a response (must include `Verdict`, `FiscalRrn`, and `FiscalId`)
5. Product is dispensed

## Exception handling

Because `Register` fires before dispensing, a failed fiscal registration can optionally trigger a transaction cancellation (disabled by default; contact your Integration Engineer to enable):

| Scenario                            | Step | Resolution                                                                                                                                           |
| ----------------------------------- | ---- | ---------------------------------------------------------------------------------------------------------------------------------------------------- |
| Sale failed or declined             | 2    | Nayax aborts the session. No `Register` call fires. Nayax does not charge the cardholder.                                                            |
| Registration declined               | 3–4  | Nayax logs the failure. By default, the transaction proceeds. If Cancel is enabled, Nayax cancels the transaction and does not dispense the product. |
| Registration timeout                | 3–4  | By default, FisCortina cancels the transaction immediately with no retries. If retry is enabled, FisCortina queues the registration for async retry. |
| Vend failed (product not dispensed) | 5    | Nayax Engine sends [`POST /FisCortina/Void`](/docs/fis-cortina/void) to un-register the fiscal record.                                               |

## Request field notes

`PaymentInfo.AuthDateTime` uses a 12-digit format for card transactions. `MachineAuTime` and `MachineSeTime` always use 17 digits:

| Field                      | Format              | Digits | Example             |
| -------------------------- | ------------------- | ------ | ------------------- |
| `PaymentInfo.AuthDateTime` | `YYMMDDHHmmss`      | 12     | `230226093406`      |
| `BasicInfo.MachineAuTime`  | `YYYYMMDDHHmmssfff` | 17     | `20260223093406383` |
| `BasicInfo.MachineSeTime`  | `YYYYMMDDHHmmssfff` | 17     | `20260223093550020` |

`BasicInfo.TransactionId` is always present for card transactions. It may be short (11 digits) or long (36 digits, zero-padded):

| Format            | Example                                |
| ----------------- | -------------------------------------- |
| Short (11 digits) | `23083406429`                          |
| Long (36 digits)  | `000000355897454624064012793151470385` |

## Next steps

<CardGroup cols={2}>
  <Card title="Void" href="/docs/fis-cortina/void">
    Un-register a transaction when a product is not dispensed.
  </Card>

  <Card title="Request & Response Reference" href="/docs/fis-cortina/response-reference">
    Full field definitions and response codes for all endpoints.
  </Card>
</CardGroup>