marketablefield on the Schema definition page.
tradablefield on the Schema definition page.
Thanks for the additional context - it helps to see the results you're getting.I reached out to an engineer who worked on this API for some background. The GetItemDefinitionProperty API intentionally prevents the client from retrieving the bundle property of generator items. If the games you work with need in-game access to that data, they'll need to either include that information in their game builds or create some other service for retrieving it.Best,Tavish