Are you checking out with Shopify Pay? Shopify Pay is a secure form of checkout similar to PayPal or Amazon Pay. Many other brands and companies use Shopify Pay as well. If you have signed up for this feature on another website, you will be able to easily checkout on any website that uses Shopify. This means all of your default information on your Shopify Pay account will enter automatically into any Shopify system during checkout once you have entered your email address. You can review your Shopify Pay account here: https://pay.shopify.com.