> For the complete documentation index, see [llms.txt](https://docs.rocketfuel.inc/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.rocketfuel.inc/plug-ins-and-sdks/javascript-js/rocketfuel-sdk-nodejs.md).

# Rocketfuel SDK nodejs

## Rocketfuel Node.js SDK Integration Guide <a href="#undefined" id="undefined"></a>

This document provides a step-by-step guide for integrating Rocketfuel’s Node.js SDK (`rocketfuel-sdk`) to generate invoices and perform purchase checks in your application.

### Prerequisites <a href="#undefined" id="undefined"></a>

* Node.js installed
* An active Rocketfuel account with access credentials:
  * `CLIENT_ID`
  * `CLIENT_SECRET`
  * `MERCHANT_ID`

### Installation

<pre class="language-bash"><code class="lang-bash"><strong>npm install @rkfl/transact-server
</strong></code></pre>

```javascript
import { Rocketfuel } from '@rkfl/transact-server';
```

### **Reading Credentials from Environment Variables**

Use environment variables for security and flexibility.

```javascript
export const CLIENT_ID = process.env.CLIENT_ID;
export const CLIENT_SECRET = process.env.CLIENT_SECRET;
export const MERCHANT_ID = process.env.MERCHANT_ID;
```

### **Initializing the Rocketfuel Client**

Initialize the `RocketfuelClient` with appropriate parameters:

```javascript
const client = new Rocketfuel({
  clientId: CLIENT_ID,
  clientSecret: CLIENT_SECRET,
  merchantId: MERCHANT_ID,
  environment: 'sandbox', // or 'production'
});
```

### References

* PayIn Integration - [Link](/plug-ins-and-sdks/javascript-js/rocketfuel-sdk-nodejs/payin.md)
* Payout Integration - [Link](/plug-ins-and-sdks/javascript-js/rocketfuel-sdk-nodejs/payouts.md)
* Age Verification - [Link](/plug-ins-and-sdks/javascript-js/rocketfuel-sdk-nodejs/age-verification.md)

####