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

# readCardForExternalTransaction

> Read card data from the device for authorization by an external payment processor.

The `readCardForExternalTransaction` method reads card data from the device so that the transaction can be authorized by an external processor instead of the built-in payment engine.

Once the card is read, pass the returned `pinpadCardDataId` to [`updatePinpadTransactionStatus`](/docs/integrate-pos-device/tweezercomm/device-methods/updatepinpadtransactionstatus) to report the outcome of the external authorization back to the device.

## Request

<Note>
  **JSON-RPC 2.0**

  All methods in TweezerComm follow a JSON-RPC 2.0 structure. See [Get Started](/docs/integrate-pos-device/tweezercomm/tweezercomm-get-started) for more details on how the requests are structured and sent.
</Note>

To invoke this method, set the `method` field to `readCardForExternalTransaction`, and include the service name and parameters as shown below.

```json theme={null}
{
    "jsonrpc": "2.0",
    "method": "readCardForExternalTransaction",
    "params": [
        "device",
        {
            "vuid": "44d96006",
            "readMifare": true
        }
    ],
    "id": "16115875"
}
```

### Request parameters

The table below describes the parameters of the request:

| Name         | Type   | Description                                               |
| ------------ | ------ | --------------------------------------------------------- |
| `vuid`       | string | Vendor (client) unique transaction identifier. Mandatory. |
| `readMifare` | bool   | Whether to enable the NFC reader (Mifare only).           |