title: Stripe checkout.js with coupons
body: <p>I'm using Stripe's <a href="https://stripe.com/blog/stripe-checkout">checkout.js</a> because it's so easy to setup and use. Is there a way to add coupons?</p>
  
  <pre><code>&lt;script src="https://checkout.stripe.com/v2/checkout.js"
      class="stripe-button"
      data-key="pk_test_czwzkTp2tactuLOEOqbMTRzG"
      data-amount="2000"
      data-name="Demo Site"
      data-description="2 widgets ($20.00)"
      data-image="/128x128.png"&gt;
  &lt;/script&gt;
  </code></pre>