With Checkout Logic, you can easily enhance your store's checkout experience with custom rules that trigger actions in payment methods, delivery options, cart validation and discounts. For our Shopify Plus merchants, our library of custom App Blocks such as Cart line edit, Images, Content, Input fields, Payment icons, and USPs, let's you add even more functionality to your checkout. Use our library of customization examples, and get started with your first customization in a matter of seconds.