Make sure to provide a Sessionize client inside of the .NET MAUI mobile app, but also have a backend service that people can host to retrieve the Sessionize data and serve it to the .NET MAUI mobile app that way.
In that way you don't have the API key in the mobile app, you can have some (easier/different) caching and people might just prefer it that way.
Lets make sure that we have code to also reach that backend service and developers can swap it out easily.