# Defend

## Overview

The `defend` method submits your formal argument against the customer's chargeback claim.

**Business Use Case:** After submitting delivery proof, submit your formal defense stating why the chargeback is illegitimate.

## Request Fields

| Field            | Type    | Required | Description                         |
| ---------------- | ------- | -------- | ----------------------------------- |
| `disputeId`      | string  | Yes      | The connector's dispute ID          |
| `reasonCode`     | string  | Yes      | Defense reason code (see below)     |
| `explanation`    | string  | Yes      | Detailed explanation                |
| `submitEvidence` | boolean | No       | Whether to submit attached evidence |

## Defense Reason Codes

| Code                            | Description                       |
| ------------------------------- | --------------------------------- |
| `product_or_service_provided`   | Product/service was delivered     |
| `customer_withdrew_dispute`     | Customer withdrew with their bank |
| `duplicate_charge_doc`          | Charge is not a duplicate         |
| `cancellation_policy_disclosed` | Customer accepted terms           |

## Response Fields

| Field              | Type          | Description            |
| ------------------ | ------------- | ---------------------- |
| `disputeId`        | string        | Connector's dispute ID |
| `defenseSubmitted` | boolean       | Success status         |
| `status`           | DisputeStatus | UNDER\_REVIEW          |
| `statusCode`       | number        | HTTP status code       |

## Example

### SDK Setup

```javascript
const { DisputeClient } = require('hyperswitch-prism');

const disputeClient = new DisputeClient({
    connector: 'stripe',
    apiKey: 'YOUR_API_KEY',
    environment: 'SANDBOX'
});
```

### Request

```javascript
const request = {
    disputeId: "dp_xxx",
    reasonCode: "product_or_service_provided",
    explanation: "Customer ordered product on 2024-01-10. Package delivered on 2024-01-15 with signature.",
    submitEvidence: true
};

const response = await disputeClient.defend(request);
```

### Response

```javascript
{
    disputeId: "dp_xxx",
    defenseSubmitted: true,
    status: "UNDER_REVIEW",
    statusCode: 200
}
```

## Next Steps

* [get](https://docs.hyperswitch.io/integrations/prism/node/dispute-service/get) - Check dispute status after submission
* Wait for bank decision (typically 60-75 days)