Learning (through logging) API's only available for standalone apps

I am developing a managed app and want to use deep linking, I was told to have a look at branch.io but found out it only works on standalone apps. So I build an android APK but now I have no way of experimenting with the API, I have to code in the dark and build everytime I think I’m onto something. Many API’s only seem to be available for standalone apps but how would you usually debug that? Expo API can differ from official API’s so continously logging the state of the app seems like the right workflow to learn but standalone apps doesn’t allow for that.