# Importing business data using API

## Obtaining API authorization keys

Log into the Elven system, and navitage to the Entity for which you wish to integrate your business data using API. Click on the **Ledger** page, then locate an **"Integrations"** button at the upper right corner of your screen.

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In the pop-up **Integration** management window, click on the **"+Add new integration"** button.

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Set a desired label name for the new data type, and click the **"Add"** button.

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Once the data type has been added, you can now add new data. Click the **"Add data"** button, and select "OpenAPI Integration" from the dropdown menu.

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In the pop-up OpenAPI Integration window, click on the "Create" button.

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In the next window, name the newly created API key.

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Click on the "Create" button to finalize creation of the new API key.

You can click on the "Copy" icon next to each Key/Secret to copy it's content into your clipboard for use.

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## Authenticating API endpoint

Provide the following parameters in the Request header.

```javascript
elven-api-key  The obtained apiKey
elven-api-sign  Signature in base64 format, e.g. LVT5aXA9064gpgZrPXPLJB/Aq9r45yMF10sTZQTteyE=
elven-api-timestamp Timestamp in milliseconds, e.g. 1721209655047, expiry is 30seconds
```

Generate the signature by concatenating the timestamp, request method, and path, then use the apisecret in a HMAC SHA256 encryption.

```javascript
// crypto uses https://github.com/nodejs/node/blob/v16.9.0/lib/crypto.js 库
  /**
   * Generate signature
   * apiSecret: BjGiqCWfHGCrl065dlEBWFO5vLj7Hqiexxx,
   * timestamp: 1721205912758
   * method POST
   *  path  /open/v3/businessData
   */
  buildSign(apiSecret: string, timestamp: number, method: string, path: string) {
    const str = `${timestamp}${method}${path}`
    return crypto.createHmac('sha256', apiSecret).update(str).digest('base64')
  }

```

Sample outcome:

```javascript
[
  'D7JLJ3awwrTdNXtSrPI1GlYE', // key
  'BjGiqCWfHGCrl065dlEBWFO5vLj7Hqie', // secret
  'POST', // method in CAPS
  '/open/v3/businessData' // not including domain, only the path starting with /
]
{
  'elven-api-key': 'D7JLJ3awwrTdNXtSrPI1GlYE',
  'elven-api-sign': 'LVT5aXA9064gpgZrPXPLJB/Aq9r45yMF10sTZQTteyE=',
  'elven-api-timestamp': 1721209655047
}
```

## Uploading business data

```javascript
POST https://openapi.elven.com/open/v3/businessData

header
{
  elven-api-key: aaaa
  elven-api-sign: bbbbbbbbbbbb
  elven-api-timestamp: 22222222
}

body
{
       businessDataTypeName: 'Settlement', // Data type that has been created
       businessDataSourceName: 'Settlement-2024-07',// For OpenAPI types that has not been created.
       businessDataList: [
               {"a": 100, "b": "buy", "c": "2024-07-01 22:33:44"},
               {"a": 100, "b": "sell", "c": "2024-07-01 23:33:44"},
               {"a": 100, "b": "buy", "c": "2024-07-02 06:33:44"},
       ]
}
```