In the embeddable SDK, the OAuth is completed slightly differently, whereby the redirect address needs to redirect the parent (as it's all loaded through an iFrame).
The wrapper will work with SDK and non-SDK apps. It is simply a tool to make server-to-server communication easier. All of the javascript and iframe techniques will need to be taken care of on your end.
In the embeddable SDK, the OAuth is completed slightly differently, whereby the redirect address needs to redirect the parent (as it's all loaded through an iFrame).
https://docs.shopify.com/embedded-app-sdk/getting-started#oauth