title: Paypal express "order summary" page
body: <p>I'm in the the process of replacing the Free and Standard paypal button with a Express checkout integration. I believe I've done most of the work but I have 2 outstanding questions.</p>
  
  <ol>
  <li><p>When using the old button it redirected me to an order summary page where I could still update the quantity of the product I wanted to buy. With Express checkout it seems that this option has dissapeaed. Whilst the quantity field is still there, it's read-only and can therefore not be altered anymore. Can I make it so this field becomes editable again?</p></li>
  <li><p>When i get redirected to the paypal site after pressing submitting the form is not consistent, I suspect Paypal is in the process of rolling out some updates to this page and is doing some A/B testing to see which layout is performing better but it would be good if someone else could confirm a similiar behaviour and if there's anything that I can do to force a particular layout? I found other posts on this forum but they were posted a while ago hence the recheck.</p></li>
  </ol>
  
  <p>Thanks</p>