Discount Ninja is meant to be used in a merchant's online store. The app uses theme app extensions to build the elements to be included in the theme.

Theme app extensions allow apps to integrate with themes seamlessly, without injecting code into the theme. When merchants uninstall apps, blocks that are associated with the apps are automatically and entirely removed from online store themes.

If you choose to set up Dynamic Pricing, markers are added to your theme to enable this feature (if your theme does not support Dynamic Pricing out-of-the-box). These markers are applied to allow the app to show discounted prices throughout your shop as well as some building blocks to communicate discounts to customers.

More information is available here: https://support.discountninja.io/en/articles/2475856-setting-up-dynamic-pricing-summary