<div class="container">
  <div class="row justify-content-md-center mt-5">
    <div class="col-12">
      <div class="card">
        <div class="card-body">
          <h5 class="card-title">Test orders for Inline Cart</h5>
          <p class="card-text">
            Setting test mode in order to use <b>card-based payment methods</b> using test cards and test cardholder names
          </p>
          <a href="#" class="btn btn-success" id="buy-button">Buy now!</a>
        </div>
      </div>
    </div>
  </div>
</div>
window.document.getElementById('buy-button').addEventListener('click', function() {
  TwoCoInlineCart.products.add({
    code: "74B8E17CC0"
  });
  TwoCoInlineCart.cart.setTest(true);
  TwoCoInlineCart.cart.checkout();
});

External CSS

  1. https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.1.3/css/bootstrap.min.css

External JavaScript

  1. https://codepen.io/2checkout-documentation/pen/Ezreqy