"""

Buying this asset went like this:
asset_id: 2493587489

headers:
- csrf-token
- x-bound-auth* (optional)

POST https://apis.roblox.com/marketplace-sales/v1/item/8387139d-2fdf-4534-849c-93e7e84f319f/purchase-item

{
    "collectibleItemId": "8387139d-2fdf-4534-849c-93e7e84f319f",
    "expectedCurrency": 1,
    "expectedPrice": 0,
    "expectedPurchaserId": "1337",
    "expectedPurchaserType": "User",
    "expectedSellerId": 1,
    "expectedSellerType": "User",
    "idempotencyKey": "896b20d0-a738-45af-91b0-d9eb4e0765ae",
    "collectibleProductId": "89bfd74b-cdab-4031-9aa8-ab2c69cc68c7"
}
"""