If you are looking for a reference implementation to use as prior art to build an integration, please make use of our example app.
This app is intended for development of the SDK and QA validation within stripe, it does not make use of a merchant backend in order to enable ad-hoc account switching to move through various countries and accounts with alternate configurations. It should not be used as a starting point for a merchant SDK integration as it makes use of various insecure practices such as sending a merchant private key over the wire on every call.