## Generate Dispute Evidence Upload URL
Generates a pre-signed URL for uploading evidence for a dispute.
Returns an object containing the URL and the object key.

## Endpoint signature

```http
POST https://api.reservepay.com/merchants/generate-dispute-evidence-upload-url HTTP/1.1
Content-Type: application/json
Accept: application/json
Authorization: Bearer <token>

{
  dispute_id: string,
  filename: string,
  md5_hash: string,
  byte_size: number,
  comment: string?,
}
```

Returns: object

## Request arguments

### `dispute_id` (string)

**Required**. The unique identifier of the dispute (dsp_...)

### `filename` (string)

**Required**. The name of the file to be uploaded. Must include the file extension (e.g., 'evidence.pdf').

### `md5_hash` (string)

**Required**. The MD5 hash of the file to be uploaded.

### `byte_size` (number)

**Required**. The size of the file in bytes.

### `comment` (string)

_Optional_. A comment for this evidence.

## Response attributes

### `url` (string)

**Always present**. The upload URL where files can be uploaded.

### `upload_id` (string)

**Always present**. The ID of the upload session.

### `headers` (object)

**Always present**. The HTTP headers required for the upload request.

## Errors specific to this endpoint

### `NOT_FOUND`

The specified dispute was not found.

### `INVALID_STATE`

The dispute is not in a state that allows evidence upload.

## Errors common to all endpoints

### `UNHANDLED_ERROR`

This error occurs when the server encounters an unexpected internal error that
it cannot handle gracefully. This typically happens due to bugs, infrastructure
issues, or edge cases that weren't anticipated during development.

### `INVALID_ARGUMENTS`

This error occurs when the request contains invalid or missing parameters.
Common cases include missing required fields, or values that don't match the
expected format or type.

### `BAD_VERSION`

This error occurs when making requests to an API version that does not exist.
This commonly happens when using an outdated SDK or when the API version
specified in the request URL is incorrect.