This top-notch checkout experience comes from premium jean company Mott & Bow. It's driven by a special "checkout offer" designed to increase your purchase...View More
size. The first image you'll see below is an example of how their sign-up/log-in page first detects whether your email is in their system or not & then shows the appropriate fields to continue. This keeps their form shorter & more efficient for a better user experience. Upon adding items & going to checkout, you're immediately presented with a 15% first-time offer, that once opted in for, is stickied at the top of the site & automatically applied at checkout. They have a beautifully-designed one-page checkout that includes a payment details section with input fields in the form of a credit card.