"""




headers:
- csrf-token
- x-bound-auth* (optional)
cookies: probably .roblosecurity

https://apis.roblox.com/cloud/v2/avatar-marketplace-orders?idempotencyKey.key=35440611-15f9-4986-a2dc-1fe7f0a8f697

{
    "purchasingUser": "users/1337",
    "context": {
        "productSurface": "SHOPPING_CART_WEB"
    },
    "fulfillmentGroups": [{
        "strategy": "BEST_EFFORT",
        "lineItems": [{
            "collectibleProductId": "1741e256-ae5b-4bf5-aef2-f6f5f3436e57",
            "agreedPriceRobux": 0
        }]
    }]
}
"""