# Post-authenticate

## Overview

The `postAuthenticate` method validates 3D Secure authentication results.

## Request Fields

| Field                | Type          | Required | Description        |
| -------------------- | ------------- | -------- | ------------------ |
| `merchantOrderId`    | String        | Yes      | Order reference    |
| `amount`             | Money         | Yes      | Transaction amount |
| `paymentMethod`      | PaymentMethod | Yes      | Card details       |
| `authenticationData` | Map           | No       | 3DS data           |

## Response Fields

| Field                | Type   | Description           |
| -------------------- | ------ | --------------------- |
| `status`             | String | AUTHENTICATED, FAILED |
| `authenticationData` | Map    | Validated 3DS data    |

## Example

```java
Map<String, Object> request = new HashMap<>();
request.put("merchantOrderId", "order_001");
request.put("amount", Map.of("minorAmount", 10000, "currency", "USD"));
request.put("authenticationData", Map.of("eci", "05", "cavv", "AAAB..."));

Map<String, Object> response = authClient.postAuthenticate(request);
```