E-commerce Email Validation:How Leading Brands ReduceCart Abandonment by 25%

<!-- Add to checkout.liquid -->
<script>
document.addEventListener('DOMContentLoaded', function() {
  const emailInput = document.querySelector('#checkout_email');

  emailInput.addEventListener('blur', async function() {
    const response = await fetch(
      'https://api.email-check.app/v1-get-email-details?' +
      new URLSearchParams({
        email: this.value,
        verifyMx: true,
        verifySmtp: true
      }),
      {
        headers: {
          'accept': 'application/json',
          'x-api-key': 'YOUR_API_KEY'
        }
      }
    );

    const result = await response.json();
    if (!result.validFormat || !result.validSmtp) {
      this.setCustomValidity('Please enter a valid email address');
      this.reportValidity();
    }
  });
});
</script>

// Add to functions.php
add_action('woocommerce_checkout_process', 'validate_checkout_email');
function validate_checkout_email() {
    $email = $_POST['billing_email'];
    $response = wp_remote_get(
        'https://api.email-check.app/v1-get-email-details?' .
        http_build_query([
            'email' => $email,
            'verifyMx' => 'true',
            'verifySmtp' => 'true'
        ]),
        [
            'headers' => [
                'accept' => 'application/json',
                'x-api-key' => 'YOUR_API_KEY'
            ]
        ]
    );

    if (!is_wp_error($response)) {
        $result = json_decode(wp_remote_retrieve_body($response));
        if (!$result->validFormat || !$result->validSmtp) {
            wc_add_notice('Please enter a valid email address', 'error');
        }
    }
}

// Add to your custom validation module
public function validateEmail(Varien_Event_Observer $observer)
{
    $email = $observer->getEvent()->getData('email');
    $client = new Zend_Http_Client();
    $client->setUri('https://api.email-check.app/v1-get-email-details');
    $client->setParameterGet(array(
        'email' => $email,
        'verifyMx' => 'true',
        'verifySmtp' => 'true'
    ));
    $client->setHeaders(array(
        'accept' => 'application/json',
        'x-api-key' => 'YOUR_API_KEY'
    ));

    $response = $client->request();
    $result = json_decode($response->getBody());

    if (!$result->validFormat || !$result->validSmtp) {
        throw new Exception('Please enter a valid email address');
    }
}