Paywall JSON and Spec?

I’m looking at making an implementation for .NET MAUI to support rendering Paywalls at the MAUI layer instead of trying to wrap the native Android/iOS SDKs to do it (the dependency graph is a bit of a nightmare to sort out for it unfortunately - the core SDKs aren’t too bad and I have working nicely).

Is there a spec or schema somewhere that I can get the details for the data returned when requesting paywalls?

I see the v2 api has an openapi spec which defines some parts, but there’s stuff like additionalProperties which seems like it could be platform specific.

Could you post specs for android/iOS at the very least, to understand more what the api might return? Alternatively, if you actually have a true unified version of the object model for web or flutter or some other framework, a comprehensive and complete spec for that would also be helpful.

Thanks