# Ethereum integration with Web3Auth JS SDK

> @web3auth/modal Ethereum integration with Web3Auth JS SDK | Embedded Wallets

While using the Embedded Wallets Web SDK, you get a [`EIP1193`](https://eips.ethereum.org/EIPS/eip-1193) provider, similar to the [Metamask provider](https://docs.metamask.io/guide/ethereum-provider.html). This provider can be used with libraries (like [`ethers.js`](https://docs.ethers.io/v5/getting-started/), [`viem`](https://viem.sh/)) to make [Ethereum](https://ethereum.org) calls like getting the user's `account`, fetching `balance`, `sign transaction`, `send transaction`, `read` from and `write` to the smart contract. We have highlighted a few examples to get you started.

## Integration

## Installation

To interact with the blockchain, you can use either the [`viem`](https://viem.sh/) or
[`ethers.js`](https://docs.ethers.io/v5/getting-started/) library with Web3Auth.

<Tabs
  defaultValue="viem"
  values={[
    { label: "viem", value: "viem" },
    { label: "ethers.js", value: "ethers" },
  ]}
>
<TabItem value="viem">

```bash npm2yarn
npm install --save viem
```

</TabItem>
<TabItem value="ethers">

```bash npm2yarn
npm install --save ethers
```

</TabItem>
</Tabs>

## Initializing provider

Using `eip155` as `chainNamespace` while initializing `web3auth` will provide an
[`EIP1193`](https://eips.ethereum.org/EIPS/eip-1193) compatible provider as **`web3auth.provider`**
after successful authentication.

### Initializing and instantiating the Embedded Wallets SDK

```tsx

const web3AuthOptions: Web3AuthOptions = {
  clientId,
  web3AuthNetwork: WEB3AUTH_NETWORK.SAPPHIRE_MAINNET,
}
```

## Getting the Embedded Wallets provider

After initializing Embedded Wallets, the next step is to initialize the provider and use it for your
operations.

```tsx
// Initialize for PnP Web SDK
await web3auth.init()

// Trigger the login
await web3auth.connect()
// await web3auth.connectTo(); // For custom flow

// Get the provider
const provider = web3auth.provider

// Continue using the `provider`
```

### Get account and balance

<Tabs
defaultValue="viem"
values={[
  { label: "viem", value: "viem" },
  { label: "ethers.js", value: "ethers.js" },
]}
>
<TabItem value="ethers.js">

```tsx
/*
  Use code from the above Initializing Provider here
*/

// provider is const provider = new ethers.providers.Web3Provider(web3Auth.provider); from above.

// For ethers v5
// const signer = ethersProvider.getSigner();
const signer = await ethersProvider.getSigner()

// Get user's Ethereum public address
const address = signer.getAddress()

// Get user's balance in ether
// For ethers v5
// const balance = ethers.utils.formatEther(
// await ethersProvider.getBalance(address) // Balance is in wei
// );
const balance = ethers.utils.formatEther(
  await provider.getBalance(address) // Balance is in wei
)
```

</TabItem>
<TabItem value="viem">

```tsx
const publicClient = createPublicClient({
  chain: mainnet, // for mainnet
  transport: custom(this.provider),
})

const walletClient = createWalletClient({
  chain: mainnet,
  transport: custom(this.provider),
})

// Get user's Ethereum public address
const address = await walletClient.getAddresses()

// Get user's balance in ether
const balance = await publicClient.getBalance({ address: address[0] })
```

</TabItem>

</Tabs>

### Send transaction

<Tabs
  defaultValue="viem"
  values={[
    { label: "viem", value: "viem" },
    { label: "ethers.js", value: "ethers" },
  ]}
>
<TabItem value="ethers">

```tsx
/*
  Use code from the above Initializing Provider here
*/

// provider is const provider = new ethers.providers.Web3Provider(web3Auth.provider); from above.

const signer = await provider.getSigner()

const destination = '0x7aFac68875d2841dc16F1730Fba43974060b907A'
const amount = ethers.parseEther('1.0') // Convert 1 ether to wei

// Submit transaction to the blockchain
const tx = await signer.sendTransaction({
  to: destination,
  value: amount,
})

// Wait for the transaction to be mined
const receipt = await tx.wait()
```

</TabItem>
<TabItem value="viem">

```tsx
/*
  Use code from the above Initializing Provider here
*/

const publicClient = createPublicClient({
  chain: mainnet, // for mainnet
  transport: custom(this.provider),
})

const walletClient = createWalletClient({
  chain: mainnet, // for mainnet
  transport: custom(this.provider),
})

// data for the transaction
const destination = '<ADDRESS>'
const amount = parseEther('0.0001')
const address = await this.getAccounts()

const address = await walletClient.getAddresses()

// Submit transaction to the blockchain
const hash = await walletClient.sendTransaction({
  account: address[0],
  to: destination,
  value: amount,
})

const receipt = await publicClient.waitForTransactionReceipt({ hash })
```

</TabItem>
</Tabs>

### Send transaction

<Tabs
  defaultValue="viem"
  values={[
    { label: "viem", value: "viem" },
    { label: "ethers.js", value: "ethers" },
  ]}
>
<TabItem value="ethers">

```tsx
/*
  Use code from the above Initializing Provider here
*/

// provider is const provider = new ethers.providers.Web3Provider(web3Auth.provider); from above.

const signer = await provider.getSigner()

const destination = '0x7aFac68875d2841dc16F1730Fba43974060b907A'
const amount = ethers.parseEther('1.0') // Convert 1 ether to wei

// Submit transaction to the blockchain
const tx = await signer.sendTransaction({
  to: destination,
  value: amount,
})

// Wait for the transaction to be mined
const receipt = await tx.wait()
```

</TabItem>
<TabItem value="viem">

```tsx
/*
  Use code from the above Initializing Provider here
*/

const publicClient = createPublicClient({
  chain: mainnet, // for mainnet
  transport: custom(this.provider),
})

const walletClient = createWalletClient({
  chain: mainnet, // for mainnet
  transport: custom(this.provider),
})

// data for the transaction
const destination = '<ADDRESS>'
const amount = parseEther('0.0001')
const address = await this.getAccounts()

const address = await walletClient.getAddresses()

// Submit transaction to the blockchain
const hash = await walletClient.sendTransaction({
  account: address[0],
  to: destination,
  value: amount,
})

const receipt = await publicClient.waitForTransactionReceipt({ hash })
```

</TabItem>
</Tabs>

### Sign message

#### Personal sign

<Tabs
  defaultValue="viem"
  values={[
    { label: "viem", value: "viem" },
    { label: "ethers.js", value: "ethers" },
  ]}
>
<TabItem value="ethers">

```tsx
/*
  Use code from the above Initializing Provider here
*/

const provider = new ethers.providers.Web3Provider(web3Auth.provider)

const signer = await provider.getSigner()

const originalMessage = 'YOUR_MESSAGE'

const signedMessage = await signer.signMessage(originalMessage)
```

</TabItem>
<TabItem value="viem">

```tsx
/*
  Use code from the above Initializing Provider here
*/

const publicClient = createPublicClient({
  chain: mainnet, // for mainnet
  transport: custom(this.provider),
})

const walletClient = createWalletClient({
  chain: mainnet, // for mainnet
  transport: custom(this.provider),
})

// data for signing
const address = await walletClient.getAddresses()
const originalMessage = 'YOUR_MESSAGE'

// Sign the message
const hash = await walletClient.signMessage({
  account: address[0],
  message: originalMessage,
})
```

</TabItem>
</Tabs>

### Sign typed data v4

<Tabs
  defaultValue="viem"
  values={[
    { label: "viem", value: "viem" },
    { label: "ethers.js", value: "ethers" },
  ]}
>
<TabItem value="viem">

```tsx
// SignTypedData in viem
// https://viem.sh/docs/actions/wallet/signTypedData

/*
  Use code from the above Initializing Provider here
*/

const walletClient = createWalletClient({
  chain: mainnet,
  transport: custom(this.provider),
})

const address = await walletClient.getAddresses()

const signature = await walletClient.signTypedData({
  account: address[0],
  domain: {
    name: 'Ether Mail',
    version: '1',
    chainId: 1,
    verifyingContract: '0xCcCCccccCCCCcCCCCCCcCcCccCcCCCcCcccccccC',
  },
  types: {
    Person: [
      { name: 'name', type: 'string' },
      { name: 'wallet', type: 'address' },
    ],
    Mail: [
      { name: 'from', type: 'Person' },
      { name: 'to', type: 'Person' },
      { name: 'contents', type: 'string' },
    ],
  },
  primaryType: 'Mail',
  message: {
    from: {
      name: 'Cow',
      wallet: '0xCD2a3d9F938E13CD947Ec05AbC7FE734Df8DD826',
    },
    to: {
      name: 'Bob',
      wallet: '0xbBbBBBBbbBBBbbbBbbBbbbbBBbBbbbbBbBbbBBbB',
    },
    contents: 'Hello, Bob!',
  },
})
```

</TabItem>
<TabItem value="ethers">

```tsx
/*
  Use code from the above initializing provider here
*/

// provider is const provider = new ethers.providers.Web3Provider(web3Auth.provider); from above.

const signer = await provider.getSigner()

// Get user's Ethereum public address
const fromAddress = await signer.getAddress()

const originalMessage = JSON.stringify({
  domain: {
    // Defining the chain aka Sepolia testnet or Ethereum Main Net
    chainId: 11155111,
    // Give a user friendly name to the specific contract you are signing for.
    name: 'Ether Mail',
    // If name isn't enough add verifying contract to make sure you are establishing contracts with the proper entity
    verifyingContract: '0xCcCCccccCCCCcCCCCCCcCcCccCcCCCcCcccccccC',
    // Just let's you know the latest version. Definitely make sure the field name is correct.
    version: '1',
  },

  // Defining the message signing data content.
  message: {
    /*
           - Anything you want. Just a JSON Blob that encodes the data you want to send
           - No required fields
           - This is dapp Specific
           - Be as explicit as possible when building out the message schema.
          */
    contents: 'Hello, Bob!',
    attachedMoneyInEth: 4.2,
    from: {
      name: 'Cow',
      wallets: [
        '0xCD2a3d9F938E13CD947Ec05AbC7FE734Df8DD826',
        '0xDeaDbeefdEAdbeefdEadbEEFdeadbeEFdEaDbeeF',
      ],
    },
    to: [
      {
        name: 'Bob',
        wallets: [
          '0xbBbBBBBbbBBBbbbBbbBbbbbBBbBbbbbBbBbbBBbB',
          '0xB0BdaBea57B0BDABeA57b0bdABEA57b0BDabEa57',
          '0xB0B0b0b0b0b0B000000000000000000000000000',
        ],
      },
    ],
  },
  // Refers to the keys of the *types* object below.
  primaryType: 'Mail',
  types: {
    // TODO: Clarify if EIP712Domain refers to the domain the contract is hosted on
    EIP712Domain: [
      { name: 'name', type: 'string' },
      { name: 'version', type: 'string' },
      { name: 'chainId', type: 'uint256' },
      { name: 'verifyingContract', type: 'address' },
    ],
    // Not an EIP712Domain definition
    Group: [
      { name: 'name', type: 'string' },
      { name: 'members', type: 'Person[]' },
    ],
    // Refer to PrimaryType
    Mail: [
      { name: 'from', type: 'Person' },
      { name: 'to', type: 'Person[]' },
      { name: 'contents', type: 'string' },
    ],
    // Not an EIP712Domain definition
    Person: [
      { name: 'name', type: 'string' },
      { name: 'wallets', type: 'address[]' },
    ],
  },
})
const params = [fromAddress, originalMessage]
const method = 'eth_signTypedData_v4'

const signedMessage = await signer.provider.send(method, params)
```

</TabItem>
</Tabs>

### Smart contract

#### Solidity contract

In this example, we'll be demonstrating how to use Web3Auth with web3.js or ethers.js to interact
with Solidity smart contracts. The simple _Hello World_ contract allows anyone to read and write a
message to it.

```tsx
// SPDX-License-Identifier: GPL-3.0
pragma solidity >=0.7.0 <0.9.0;

contract HelloWorld {

  string public message;

  constructor(string memory initMessage) {
    message = initMessage;
  }

  function update(string memory newMessage) public {
    message = newMessage;
  }
}
```

### Deploy contract

<Tabs
  defaultValue="viem"
  values={[
    { label: "viem", value: "viem" },
    { label: "ethers.js", value: "ethers" },
  ]}
>

<TabItem value="ethers">

```tsx
/*
  Use code from the above initializing provider here
*/

// provider is const provider = new ethers.providers.Web3Provider(web3Auth.provider); from above.

const signer = provider.getSigner();

const contractABI = [
  { inputs: [{ internalType: "string", name: "initMessage", type: "string" }], stateMutability: "nonpayable", type: "constructor" },
  { inputs: [], name: "message", outputs: [{ internalType: "string", name: "", type: "string" }], stateMutability: "view", type: "function" },
  {
    inputs: [{ internalType: "string", name: "newMessage", type: "string" }],
    name: "update",
    outputs: [],
    stateMutability: "nonpayable",
    type: "function",
  },
];
const contractByteCode =
  "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";

const address = signer.getAddress();

const contractFactory = new ContractFactory(JSON.parse(JSON.stringify(contractABI), contractByteCode, address);
// Deploy contract with "Hello World!" in the constructor
const contract = await contractFactory.deploy("Hello World!");

// Wait for deployment to finish
const receipt = await contract.deployed();

const deployedContractAddress = receipt.contractAddress;
```

</TabItem>
<TabItem value="viem">

```tsx
/*
  Use code from the above Initializing Provider here
*/
const publicClient = createPublicClient({
  chain: this.getViewChain(),
  transport: custom(this.provider),
})

const walletClient = createWalletClient({
  chain: mainnet,
  transport: custom(this.provider),
})

const contractABI = [
  {
    inputs: [{ internalType: 'string', name: 'initMessage', type: 'string' }],
    stateMutability: 'nonpayable',
    type: 'constructor',
  },
  {
    inputs: [],
    name: 'message',
    outputs: [{ internalType: 'string', name: '', type: 'string' }],
    stateMutability: 'view',
    type: 'function',
  },
  {
    inputs: [{ internalType: 'string', name: 'newMessage', type: 'string' }],
    name: 'update',
    outputs: [],
    stateMutability: 'nonpayable',
    type: 'function',
  },
]
const contractByteCode =
  '60806040523480156200001157600080fd5b5060405162000bee38038062000bee8339818101604052810190620000379190620001e3565b80600090816200004891906200047f565b505062000566565b6000604051905090565b600080fd5b600080fd5b600080fd5b600080fd5b6000601f19601f8301169050919050565b7f4e487b7100000000000000000000000000000000000000000000000000000000600052604160045260246000fd5b620000b9826200006e565b810181811067ffffffffffffffff82111715620000db57620000da6200007f565b5b80604052505050565b6000620000f062000050565b9050620000fe8282620000ae565b919050565b600067ffffffffffffffff8211156200012157620001206200007f565b5b6200012c826200006e565b9050602081019050919050565b60005b83811015620001595780820151818401526020810190506200013c565b60008484015250505050565b60006200017c620001768462000103565b620000e4565b9050828152602081018484840111156200019b576200019a62000069565b5b620001a884828562000139565b509392505050565b600082601f830112620001c857620001c762000064565b5b8151620001da84826020860162000165565b91505092915050565b600060208284031215620001fc57620001fb6200005a565b5b600082015167ffffffffffffffff8111156200021d576200021c6200005f565b5b6200022b84828501620001b0565b91505092915050565b600081519050919050565b7f4e487b7100000000000000000000000000000000000000000000000000000000600052602260045260246000fd5b600060028204905060018216806200028757607f821691505b6020821081036200029d576200029c6200023f565b5b50919050565b60008190508160005260206000209050919050565b60006020601f8301049050919050565b600082821b905092915050565b600060088302620003077fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff82620002c8565b620003138683620002c8565b95508019841693508086168417925050509392505050565b6000819050919050565b6000819050919050565b6000620003606200035a62000354846200032b565b62000335565b6200032b565b9050919050565b6000819050919050565b6200037c836200033f565b620003946200038b8262000367565b848454620002d5565b825550505050565b600090565b620003ab6200039c565b620003b881848462000371565b505050565b5b81811015620003e057620003d4600082620003a1565b600181019050620003be565b5050565b601f8211156200042f57620003f981620002a3565b6200040484620002b8565b8101602085101562000414578190505b6200042c6200042385620002b8565b830182620003bd565b50505b505050565b600082821c905092915050565b6000620004546000198460080262000434565b1980831691505092915050565b60006200046f838362000441565b9150826002028217905092915050565b6200048a8262000234565b67ffffffffffffffff811115620004a657620004a56200007f565b5b620004b282546200026e565b620004bf828285620003e4565b600060209050601f831160018114620004f75760008415620004e2578287015190505b620004ee858262000461565b8655506200055e565b601f1984166200050786620002a3565b60005b8281101562000531578489015182556001820191506020850194506020810190506200050a565b868310156200055157848901516200054d601f89168262000441565b8355505b6001600288020188555050505b505050505050565b61067880620005766000396000f3fe608060405234801561001057600080fd5b50600436106100365760003560e01c80633d7403a31461003b578063e21f37ce14610057575b600080fd5b61005560048036038101906100509190610270565b610075565b005b61005f610088565b60405161006c9190610338565b60405180910390f35b80600090816100849190610570565b5050565b6000805461009590610389565b80601f01602080910402602001604051908101604052809291908181526020018280546100c190610389565b801561010e5780601f106100e35761010080835404028352916020019161010e565b820191906000526020600020905b8154815290600101906020018083116100f157829003601f168201915b505050505081565b6000604051905090565b600080fd5b600080fd5b600080fd5b600080fd5b6000601f19601f8301169050919050565b7f4e487b7100000000000000000000000000000000000000000000000000000000600052604160045260246000fd5b61017d82610134565b810181811067ffffffffffffffff8211171561019c5761019b610145565b5b80604052505050565b60006101af610116565b90506101bb8282610174565b919050565b600067ffffffffffffffff8211156101db576101da610145565b5b6101e482610134565b9050602081019050919050565b82818337600083830152505050565b600061021361020e846101c0565b6101a5565b90508281526020810184848401111561022f5761022e61012f565b5b61023a8482856101f1565b509392505050565b600082601f8301126102575761025661012a565b5b8135610267848260208601610200565b91505092915050565b60006020828403121561028657610285610120565b5b600082013567ffffffffffffffff8111156102a4576102a3610125565b5b6102b084828501610242565b91505092915050565b600081519050919050565b600082825260208201905092915050565b60005b838110156102f35780820151818401526020810190506102d8565b60008484015250505050565b600061030a826102b9565b61031481856102c4565b93506103248185602086016102d5565b61032d81610134565b840191505092915050565b6000602082019050818103600083015261035281846102ff565b905092915050565b7f4e487b7100000000000000000000000000000000000000000000000000000000600052602260045260246000fd5b600060028204905060018216806103a157607f821691505b6020821081036103b4576103b361035a565b5b50919050565b60008190508160005260206000209050919050565b60006020601f8301049050919050565b600082821b905092915050565b60006008830261041c7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff826103df565b61042686836103df565b95508019841693508086168417925050509392505050565b6000819050919050565b600081905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const [account] = await walletClient.getAddresses()
const hash = await walletClient.deployContract({
  abi: this.contractABI,
  account,
  bytecode: this.contractByteCode,
  args: ['Hello World!'],
})

const receipt = await publicClient.waitForTransactionReceipt({ hash })

const deployedContractAddress = receipt.contractAddress
```

</TabItem>
</Tabs>

### Read from contract

<Tabs
  defaultValue="viem"
  values={[
    { label: "viem", value: "viem" },
    { label: "ethers.js", value: "ethers" },
  ]}
>

<TabItem value="ethers">

```tsx
/*
  Use code from the above Initializing Provider here
*/

// provider is const provider = new ethers.providers.Web3Provider(web3Auth.provider); from above.

const signer = await provider.getSigner()

const contractABI = [
  {
    inputs: [{ internalType: 'string', name: 'initMessage', type: 'string' }],
    stateMutability: 'nonpayable',
    type: 'constructor',
  },
  {
    inputs: [],
    name: 'message',
    outputs: [{ internalType: 'string', name: '', type: 'string' }],
    stateMutability: 'view',
    type: 'function',
  },
  {
    inputs: [{ internalType: 'string', name: 'newMessage', type: 'string' }],
    name: 'update',
    outputs: [],
    stateMutability: 'nonpayable',
    type: 'function',
  },
]
const contractAddress = '0x04cA407965D60C2B39d892a1DFB1d1d9C30d0334'
const contract = new ethers.Contract(
  contractAddress,
  JSON.parse(JSON.stringify(contractABI)),
  signer
)

// Read message from smart contract
const message = await contract.message()
```

</TabItem>
<TabItem value="viem">

```tsx
/*
  Use code from the above Initializing Provider here
*/

const contractABI = [
  {
    inputs: [{ internalType: 'string', name: 'initMessage', type: 'string' }],
    stateMutability: 'nonpayable',
    type: 'constructor',
  },
  {
    inputs: [],
    name: 'message',
    outputs: [{ internalType: 'string', name: '', type: 'string' }],
    stateMutability: 'view',
    type: 'function',
  },
  {
    inputs: [{ internalType: 'string', name: 'newMessage', type: 'string' }],
    name: 'update',
    outputs: [],
    stateMutability: 'nonpayable',
    type: 'function',
  },
]

const publicClient = createPublicClient({
  chain: mainnet, // for mainnet
  transport: custom(this.provider),
})

const contractAddress = '0x8AA6820B3F197384874fAdb355361758258cb981' // On Sepolia, replace with your contract address

// Read message from smart contract
const message = await publicClient.readContract({
  address: contractAddress,
  abi: contractABI,
  functionName: 'message',
})
```

</TabItem>
</Tabs>

### Write to contract

<Tabs
  defaultValue="viem"
  values={[
    { label: "viem", value: "viem" },
    { label: "ethers.js", value: "ethers" },
  ]}
>

<TabItem value="ethers">

```tsx
/*
  Use code from the above Initializing Provider here
*/

// provider is const provider = new ethers.providers.Web3Provider(web3Auth.provider); from above.

const signer = await provider.getSigner()

const contractABI = [
  {
    inputs: [{ internalType: 'string', name: 'initMessage', type: 'string' }],
    stateMutability: 'nonpayable',
    type: 'constructor',
  },
  {
    inputs: [],
    name: 'message',
    outputs: [{ internalType: 'string', name: '', type: 'string' }],
    stateMutability: 'view',
    type: 'function',
  },
  {
    inputs: [{ internalType: 'string', name: 'newMessage', type: 'string' }],
    name: 'update',
    outputs: [],
    stateMutability: 'nonpayable',
    type: 'function',
  },
]
const contractAddress = '0x04cA407965D60C2B39d892a1DFB1d1d9C30d0334'
const contract = new ethers.Contract(
  contractAddress,
  JSON.parse(JSON.stringify(contractABI)),
  signer
)

// Send transaction to smart contract to update message
const tx = await contract.update('NEW_MESSAGE')

// Wait for transaction to finish
const receipt = await tx.wait()
```

</TabItem>
<TabItem value="viem">

```tsx
/*
  Use code from the above Initializing Provider here
*/

const contractABI = [
  {
    inputs: [{ internalType: 'string', name: 'initMessage', type: 'string' }],
    stateMutability: 'nonpayable',
    type: 'constructor',
  },
  {
    inputs: [],
    name: 'message',
    outputs: [{ internalType: 'string', name: '', type: 'string' }],
    stateMutability: 'view',
    type: 'function',
  },
  {
    inputs: [{ internalType: 'string', name: 'newMessage', type: 'string' }],
    name: 'update',
    outputs: [],
    stateMutability: 'nonpayable',
    type: 'function',
  },
]
const publicClient = createPublicClient({
  chain: mainnet,
  transport: custom(this.provider),
})

const walletClient = createWalletClient({
  chain: mainnet,
  transport: custom(this.provider),
})

const contractAddress = '0x8AA6820B3F197384874fAdb355361758258cb981' // On Sepolia, replace with your contract address
address = await walletClient.getAddresses()

// Submit transaction to the blockchain
const hash = await walletClient.writeContract({
  account: address[0],
  address: contractAddress,
  abi: JSON.parse(JSON.stringify(contractABI)),
  functionName: 'update',
  args: ['NEW_MESSAGE'],
})

// Send transaction to smart contract to update message
const receipt = await publicClient.waitForTransactionReceipt({ hash })
```

</TabItem>
</Tabs>

### Fetch user's private key

`private_key` is used to fetch the private key of the logged in user. It is only available for
`in-app` adapters like `auth`.

```tsx
//Assuming user is already logged in.
async getPrivateKey() {
  const privateKey = await web3auth.provider.request({
    method: "private_key"
  });
  //Do something with privateKey
}
```