ManifestGroup

{
    "catalog_item_id": "01JMHK7A9B2C4D5E6F7G8H9J0",
    "group_id": "01JMHKD5H8J0K2L3M4N5P6Q7R8",
    "name": "Starter Pack",
    "contents": [
        {
            "reward_kind": "asset",
            "details": {
                "id": "01JMHK9C1D4E6F8G9H0J1K2L3",
                "name": "Gold Coins",
                "amount": "500"
            }
        }
    ]
}