More specifically, I want to fetch all limited items owned by a user. I'm trying to make a trade simulator game where they can chose to start out with any limiteds they already own.
I've seen Roblox's API (http://api.roblox.com/docs) but nowhere does it allow you to fetch a list of items they own. I'm honestly lost here, any help would be appreciated.
You can use the GET /v1/users/{userId}/assets/collectibles web API endpoint for this. You'll need to use a proxy of some sort, since Roblox does not support making HTTP requests directly to *.roblox.com with HttpService
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(Great idea to let players start out with limiteds they own, by the way.)