<!-- replace ".card_options" -->
<div class="card_options">
    <input id="use_existing_card_no" name="use_existing_card" type="radio" value="yes" style="display:none">
</div>

<!-- replace ".card_options" -->
<div class="card_options">
  <%= radio_button_tag 'use_existing_card', 'yes', false %>
  <label for="use_existing_card_yes">Use an existing card on file</label>
  <br/>
  <%= radio_button_tag 'use_existing_card', 'no', true %>
  <label for="use_existing_card_no">Use a new card / payment method</label>
</div>

Remove card options from checkout.
Remove card options from checkout.
