With respect to these, you might want to check out older threads, such as this one, or some external blog posts that already tackled the problem as this is quite a common topic. App Inventor does not support ads & in-app payments on it's own (although it is possible with a WebViewer component theoretically). Generally, you'll more than likely want an extension to handle this for you (or even further, a distribution such as Kodular that already implements monetization extensions)
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