Shopify’s latest update includes a major overhaul to its checkout pages that aims to provide a more streamlined user experience, including a “one-page” checkout and code-free ways to offer functions like loyalty memberships, add-ons or ID verifications.The platform, which claims to account for 10% of all U.S. e-commerce and $444 billion in global economic activity, unveiled the upgrades Thursday during its twice-yearly Shopify Editions announcement.