# DFNS

Dfns is a cybersecurity company providing crypto wallet infrastructure. The company develops a wallet-as-a-service infrastructure in Web3. \
\
To use DFNS with expand.network [<mark style="color:blue;">**SDK**</mark>](https://github.com/expand-network/sdk-nodejs.git), follow these steps:-

### **Step 1:** Installation

&#x20;User needs to install the expand.network SDK using the following command:&#x20;

```git
npm i expand-network
```

### **Step 2: Wallet Initialisation**

```javascript
const { WalletDFNS , prepareTransaction } = require('expand-network');
async function initialiseDFNSWallet(){
    const options = {};
    options.privateKey = process.env.DFNS_PRIVATE_KEY;
    options.credId = process.env.DFNS_CRED_ID;
    options.xApiKey = process.env.X_API_KEY;
    options.appId = process.env.DFNS_APP_ID;
    options.authToken = process.env.DFNS_ACCESS_TOKEN;
    options.baseUrl = process.env.DFNS_API_URL;
    options.walletId = process.env.WALLET_ID;
    options.appOrigin = 'http://localhost:3000';
    const wallet  = await new WalletDFNS(options);
    return wallet;
}

const wallet = await initialiseDFNSWallet();    // Initialise the wallet client
```

### **Step 3: Prepare Transaction**

```javascript
// Preparing the approve transaction from expand.network
const prepareApproveTx = await prepareTransaction('https://api.expand.network/fungibletoken/approve', {       
        "from": "OWNER_WALLET_ADDRESS",
        "tokenAddress": "TOKEN_CONTRACT_ADDRESS",
        "to": "SPENDER_WALLET_ADDRESS",
        "amount": "100000",
        "gas": "25000",
        "xApiKey": "YOUR_API_KEY"     // Replace this with your API Key
    });
prepareApproveTx.chainId = '1'; 
```

### **Step 4: Sign Transaction**

```javascript
// Sign the transaction locally using sdk client
const approveSignedTx = await wallet.signTransaction(prepareApproveTx);         
approveSignedTx.chainId = '1';  // Replace with other chainId to toggle between chains
```

### **Step 5: Send Transaction**

```javascript
// Send the signed transaction
let txHash = await wallet.sendTransaction(approveSignedTx);         
console.log(`approve transaction: https://etherscan.io/tx/${txHash.TxHash}`);  // Confirmation
```

### Sample code to perform a swap using DFNS:&#x20;

```javascript
const { WalletDFNS , prepareTransaction } = require('expand-network');
const dotenv = require('dotenv');
async function initialiseDFNSWallet(){
    const options = {};
    options.privateKey = process.env.DFNS_PRIVATE_KEY;
    options.credId = process.env.DFNS_CRED_ID;
    options.xApiKey = process.env.X_API_KEY;
    options.appId = process.env.DFNS_APP_ID;
    options.authToken = process.env.DFNS_ACCESS_TOKEN
    options.baseUrl = process.env.DFNS_API_URL;
    options.walletId = process.env.WALLET_ID;
    options.appOrigin = 'http://localhost:3000';
    const wallet  = await new WalletDFNS(options);
    return wallet;
}

async function main() {
    dotenv.config();            
    const wallet = await initialiseDFNSWallet();            // Initialise the wallet client
    const xApiKey = process.env.X_API_KEY;      
    const prepareApproveTx = await prepareTransaction('https://api.expand.network/fungibletoken/approve', {       // Prepare the approve transaction from expand.network
        "from": "OWNER_WALLET_ADDRESS",
        "tokenAddress": "TOKEN_CONTRACT_ADDRESS",
        "to": "SPENDER_WALLET_ADDRESS",
        "amount": "100000",
        "gas": "25000",
        "xApiKey": "YOUR_API_KEY"                     // Replace this with your API Key
    });
    prepareApproveTx.chainId = '1';          // Replace with other chainId to toggle between chains

    const approveSignedTx = await wallet.signTransaction(prepareApproveTx);             // Sign the transaction locally using sdk client

    approveSignedTx.chainId = '1';          // Replace with other chainId to toggle between chains
              

    let txHash = await wallet.sendTransaction(approveSignedTx);                 // Send the transaction
    console.log(`approve transaction: https://etherscan.io/tx/${txHash.TxHash}`);          // Confirmation
    
    const swapTransaction = await prepareTransaction('https://api.expand.network/dex/swap',{            // Simlarly build the swap Tx
            "dexId":"1000",  // Replace with other dexId to toggle between dexs
            "amountIn": "100000",
            "amountOutMin": "0",
            "path": ["TOKEN_ADDRESS_TO_SWAP_FROM","TOKEN_ADDRESS_TO_SWAP_TO"],
            "to": "RECEIVER_WALLET_ADDRESS",
            "deadline": "1965990894",
            "from": "SENDER_WALLET_ADDRESS",
            "gas": "173376",
            "xApiKey": "YOUR_API_KEY"               // Replace this with your API Key
    });
    console.log(swapTransaction);
    swapTransaction.chainId = '1';              // Replace with other chainId to toggle between chains

    const swapSignedTx = await wallet.signTransaction(swapTransaction);
    swapSignedTx.chainId = '1'                  // Replace with other chainId to toggle between chains

    const txHash1 = await wallet.sendTransaction(swapSignedTx);
    console.log(`swap transaction: https://etherscan.io/tx/${txHash1.TxHash}`);
}
main();
```


---

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