Externally, you can use the https://thumbnails.roblox.com/v1/batch
endpoint. Worth noting that developer products have two internal IDs, you can’t use the normal ID that Roblox normally provides you.
You can get this internal ID through:
- Engine API:
game.MarketplaceService:GetProductInfo(RobloxProvidedID, Enum.InfoType.Product).TargetId
- Web API:
https://apis.roblox.com/developer-products/v1/developer-products/{RobloxProvidedID}/details
(TargetId
in JSON response)
https://create.roblox.com/docs/cloud/features/thumbnails#/default/post_v1_batch