Monetization for extensions

When monetization fully rolls out, will there be a way for 3rd party apps to track in-extension purchases?

For example, if I’m doing analytics for a streamer, part of which currently includes data on tips and bits, and that streamer wanted to start using extension ‘abc’ that had in-extension monetization, if I want to record that data and includes it in the reports will I be able to do that through Twitch with an appropriate OAuth token/scope (ie, will there be a pubsub event when a transaction happens)? Or will the only way obtain that data, if I’m not the extension dev myself, be by having the streamer export the data (if that’s an option) or hoping the extension dev will create an API on their end to support it?