How to create sell order?

[Anunah9]

I try to create sell order. I log in to the site as in the example. .is_alive_session() specifies true. But when I try to create request, I get the error:

{
  "code": "CSRF Verification Error", 
  "error": "\u0421\u0440\u043e\u043a \u0434\u0435\u0439\u0441\u0442\u0432\u0438\u044f \u0441\u0442\u0440\u0430\u043d\u0438\u0446\u044b \u0438\u0441\u0442\u0435\u043a, \u043e\u0431\u043d\u043e\u0432\u0438\u0442\u0435 \u0442\u0435\u043a\u0443\u0449\u0443\u044e \u0441\u0442\u0440\u0430\u043d\u0438\u0446\u0443", 
  "extra": null
}

Code for creating a request for sale:

async def create_sell_offer(buff: Buff):
    url = 'https://buff.163.com/api/market/sell_order/create/manual_plus'
    params = """{"game": "csgo", "assets": [
        {"game": "csgo", "market_hash_name": "Snakebite Case", "contextid": 2, "assetid": "30175988177",
         "classid": "4418618853", "instanceid": "0", "goods_id": 857515, "price": 10, "income": 9.75,
         "has_market_min_price": False, "cdkey_id": ""}]}"""
    response = await buff.request(url, method='POST', params=params)
    print(response)

[sometastycake]

@Anunah9 Hello
You received error 'Срок действия страницы истек, обновите текущую страницу'
I think authorization work correctly, but need understand how to work sell orders. You can see in browser dev tools which params send this api. Maybe some additional keys are generated there? I have it in plans

And try to send params as dict, not str

params = {
   "game": "csgo",
   "assets":[
      {
         "game": "csgo",
         "market_hash_name": "Snakebite Case",
         "contextid": 2,
         "assetid": "30175988177",
         "classid": "4418618853",
         "instanceid": "0",
         "goods_id": 857515,
         "price": 10,
         "income": 9.75,
         "has_market_min_price": False,
         "cdkey_id": ""
      }
   ]
}
response = await buff.request(url, method='POST', json=params)

[NiJiSann]

you need to provide lot more information in headers