In order to use the app, your store needs to make use of checkout extensibility. This requires you to migrate from checkout.liquid, see details from Shopify here. You can install the app to configure your widgets before migrating, but please be aware that checkout.liquid is not supported while using checkout extensions. Our team of onboarding specialists will be there to successfully complete the migration and move over your existing customizations to Checkout Builder. [BR] [BR] Schedule a call to get started here.