Step by Step
First install the app through Shopify and selecting a subscription as usual.
With the new checkout, Shopify asks the Store Owners to add the app blocks themselves. This ensures the security of the store and the checkout pages look the way you want them to.
This can be done from Shop Admin > Settings > Checkout > Customize > Use the banner to navigate to Thank You and Order Status pages.
Then, click on the “Add app block” option at the bottom left of the screen for both.
Demo Video
Tip
If you have certain Shopify subscriptions this might appear as an icon below the little cog icon instead.