Toki works with Tapcart through their seamless Web-based Custom Screens. No additional coding is required. In order to implement your rewards explainer page or rewards account page all you need to do it create on your Shopify site and then create a custom screen in Tapcart. Here is how:

If you want your members to be able to spent their points/credit on the app, you will need to facilitate the web based checkout. Which means toggling off the native checkout. Seen here: