Sorry if I don’t actually know too much about this specific thing, but looking a bit at the HttpService you need to be sure to follow important information:
From:
Requests cannot be made to any Roblox website, such as www.roblox.com.
So I would have the approach of manually adding the items with their respective ID manually and looking for the API to get the item info.
From:
Using the MarketplaceService might be your best choice
