# Documents

#### `POST /participants/documents` <a href="#post-participants-documents" id="post-participants-documents"></a>

```
const postParticipantDocument = (filepath) => {
  const document = fs.readFileSync(filepath).toString('base64')

  const body = {
    document,
    mime: 'pdf',
    file_name: 'supporting_document.pdf',
    participant_code: 'ABC123'
  }

  const timestamp = Math.round(Date.now() / 1000)
  const payload = timestamp + 'POST' + '/participants/documents' + JSON.stringify(
    {})
  const decodedSecret = Buffer.from(apiSecret, 'base64')
  const hmac = crypto.createHmac('sha256', decodedSecret)
  const signedPayload = hmac.update(payload).digest('base64')

  const fileHash = crypto
    .createHash('sha256')
    .update(body.document)
    .digest('base64')

  // SET HEADERS
 const headers = {
    'X-NDAX-API-KEY': 'public_key',
    'X-NDAX-SIGNED': signedPayload,
    'X-NDAX-TIMESTAMP': timestamp,
    'X-NDAX-PASSPHRASE': 'passphrase'
  }
  const options = {
    headers,
    body,
    json: true
  }

  return request.post(
    `https://api.ndax.in/participants/documents`,
    options
  )
}
```

> Sample Request

```
{
  "document": "aGVsbG8gd29ybGQ=",
  "mime": "pdf",
  "file_name": "supporting_document.pdf",
  "participant_code": "ABC123"
}
```

> Sample Response

```
{
  "message": {
    "state": "Success",
    "file_name": "supporting_document.pdf",
    "created_at": 1572899177383
  }
}
```

Submits a document on behalf of you or a customer if you operate a platform on NDAX. In order to Authenticate you will need to do the following:

* Set your X-NDAX-FILE-HASH header to the sha256 hash (in a byte array) of your file contents and encode this data to base64 string.
* Make sure to use `{}` as your body when signing your request. If you use your actual request body to sign you will receive and `Invalid Client Signature`.
* Ensure that your file is not larger than 10mb.
* Remember to base 64 encode your file before sending it to us.

&#x20;You will need to add an additional "X-NDAX-FILE-HASH" header to make this request.

Request body:

<table><thead><tr><th width="198.33333333333331">Parameter</th><th width="470">Description</th><th>Type</th></tr></thead><tbody><tr><td>document</td><td>base 64 encoded file that you wish to upload (10mb limit)</td><td>binary</td></tr><tr><td>mime</td><td>The MIME type of the file you are uploading</td><td>string</td></tr><tr><td>file_name</td><td>The name of the document that you are uploading</td><td>string</td></tr><tr><td>participant_code</td><td>Your participant code, or the participant_code of the customer on behalf of whom you are uploading the document</td><td>string</td></tr></tbody></table>


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.ndax.in/v3/private-endpoints/participants/documents.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.