> ## Documentation Index
> Fetch the complete documentation index at: https://etherspot.fyi/llms.txt
> Use this file to discover all available pages before exploring further.

# Instantiation

<Info>
  Before doing anything with the SessionKeyValidatorSDK,
  you must ensure that the walletPrivateKey being used must have a etherspot-modular-account.
  SessionKeys can be created on an existing etherspotModularWallet with ERC20SessionKeyValidator
  installed to it

  For Steps to install ERC20SessionKeyValidator, please follow instructions in: [install-module](/modular-sdk/examples/install-module)
</Info>

Step 1. set .env variables via export or in your .env
If you chose to use them directly skip to Step-2

```sh theme={null}
export WALLET_PRIVATE_KEY=''
export CHAIN_ID=
export API_KEY=''
```

Step 2. Import the Etherspot Modular SDK.

```javascript theme={null}
  import { ModularSdk, SessionKeyValidator } from '@etherspot/modular-sdk';
```

Step 3. Instantiate the SDK with below initialisation properties using this block of code.

* privateKey
* ChainID
* bundlerProvider
* bundlerApiKey
* customBundlerUrl (can be left empty)

```javascript theme={null}

import { EtherspotBundler, ModularSdk, SessionKeyValidator, KeyStore, sleep } from '@etherspot/modular-sdk';
import * as dotenv from 'dotenv';

dotenv.config();

const bundlerApiKey = process.env.API_KEY as string;
const chainId = Number(process.env.CHAIN_ID);
const privateKey = process.env.WALLET_PRIVATE_KEY as string;
const customBundlerUrl = '';

const modularSdk = new ModularSdk(
  { 
    privateKey: privateKey 
  }, 
  { 
    chainId: chainId, 
    bundlerProvider: new EtherspotBundler(chainId, 
    bundlerApiKey, customBundlerUrl) 
  }
);

// get instance  of SessionKeyValidator
const sessionKeyModule = await SessionKeyValidator.create(
  modularSdk,
  new EtherspotBundler(chainId, bundlerApiKey)
)
```

And that's it! You're now ready to call any of the SessionKeyValidator SDK [functions.](/modular-sdk/sessionkey/functions)

You can also pass in different parameters when instantiating the SDK.

* chainId : The chain ID of the blockchain.
* customBundlerUrl : The bundler you wish to use.

In the next page we'll take a look at the various functions the SessionKeyValidator SDK offers.