# Charge

## Overview

The `charge` method processes a recurring payment using an existing mandate.

## Request Fields

| Field                   | Type   | Required | Description      |
| ----------------------- | ------ | -------- | ---------------- |
| `merchantTransactionId` | String | Yes      | Your reference   |
| `amount`                | Money  | Yes      | Amount to charge |
| `mandateId`             | String | Yes      | Mandate ID       |

## Response Fields

| Field    | Type          | Description        |
| -------- | ------------- | ------------------ |
| `status` | PaymentStatus | SUCCEEDED, PENDING |

## Example

```java
Map<String, Object> request = new HashMap<>();
request.put("merchantTransactionId", "txn_sub_001");
request.put("amount", Map.of("minorAmount", 2900, "currency", "USD"));
request.put("mandateId", "mandate_xxx");

Map<String, Object> response = recurringClient.charge(request);
```