• Start a New Project: Log in to your WeWeb account and create a new project or open your existing project where you want to implement two-factor authentication (2FA).
• Enable User Auth: Navigate to the authentication section within WeWeb and make sure user authentication is enabled for your project.

• Set Up Backend: Ensure you have a backend framework that supports 2FA. Popular choices include Firebase, Auth0, or custom implementations using Node.js or Python.
• Install Libraries: If you're using a custom backend, install the necessary libraries for 2FA. For example:
  ```sh
  npm install speakeasy --save
  npm install qrcode --save
  ```

• Generate Secret Key: In your backend, generate a secret key for 2FA using a library like Speakeasy.
  ```javascript
  const speakeasy = require('speakeasy');
  const secret = speakeasy.generateSecret({ length: 20 });
  console.log(secret.base32); // Save this secret in your database
  ```

• Create API Endpoints: Create API endpoints for:

• Generating QR code for user setup

• Verifying the 2FA code during login
  ```javascript
  // Generate QR Code
  app.get('/generate-qr', (req, res) => {
  const { otpauth_url } = speakeasy.generateSecret({
  length: 20,
  name: 'WeWeb-App'
  });
  res.send(QRCode.toDataURL(otpauth_url));
  });

  // Verify Token
  app.post('/verify-token', (req, res) => {
  const { token, secret } = req.body;
  const verified = speakeasy.totp.verify({
  secret,
  encoding: 'base32',
  token
  });
  if (verified) {
  res.send({ status: 'success' });
  } else {
  res.send({ status: 'error' });
  }
  });
  ```

• Add New Workflow: Within WeWeb, add a new workflow for user login that incorporates 2FA. Go to the workflow editor and create a new workflow triggered upon successful password authentication.
• Call Generate QR API: In the workflow, add a step to call the '/generate-qr' API endpoint and display the QR code to the user during initial setup.
• Add Token Verification Step: During subsequent logins, add a workflow step to call the '/verify-token' API with the user-entered 2FA code and handle responses accordingly.

• Create QR Code Screen: Create a screen in WeWeb for displaying the QR code. This screen should prompt users to scan the QR code using an authenticator app like Google Authenticator.
• Input for 2FA Code: Create an input field for the user to enter the 2FA code from their authenticator app.
• Error Handling: Add error messages and retries if the 2FA code is incorrect.

<div>
  <img id="qr-code" src="{{qrCodeUrl}}" alt="Scan this QR code with your Authenticator app">
  <input type="text" placeholder="Enter 2FA Code" id="2fa-code">
  <button onClick="verify2FACode()">Verify</button>
  <div id="error-message"></div>
</div>

• JavaScript Verification: Add JavaScript logic to handle the verification process. This includes making a request to the '/verify-token' endpoint with the input code and handling success or failure responses.

function verify2FACode() {
  const userInputCode = document.getElementById('2fa-code').value;
  fetch('/verify-token', {
    method: 'POST',
    headers: {
      'Content-Type': 'application/json'
    },
    body: JSON.stringify({ token: userInputCode, secret: userSecret })
  })
  .then(response => response.json())
  .then(data => {
    if(data.status === 'success') {
      // Proceed with login or display success message
    } else {
      document.getElementById('error-message').innerText = 'Invalid 2FA Code, please try again.';
    }
  });
}

• Run Tests: Add extensive testing for all possible scenarios including QR code generation, successful and failed 2FA code verification.
• User Experience Testing: Ensure the user experience is smooth and intuitive, making any necessary adjustments to the UI and workflow.