title: GA: enhanced ecommerce checkout products
body: <p>I m starting working on Enhanced Ecommerce Especially on the checkout process.
  I am using <a href="https://enhancedecommerce.appspot.com/" rel="nofollow noreferrer">this website</a> as reference.</p>
  
  <p>My question is in the checkout process, why we are obliged to send in every step the entire cart (all the products)?</p>