[Python] Shopee API request failed and give response "error_auth"

this is my first time asking in stackoverflow. I want to fetch data using Shopee API. I follow the documentation in Shopee but it always return "error_auth". How can I fix this ? Here is the code below :

import hmac
import time
import requests
import hashlib

timest = int(time.time())
host = "https://partner.shopeemobile.com"
path = "/api/v2/shop/auth_partner"
redirect_url = "http://localhost:3000"
partner_id =
partner_key = ""

base_string = "%s%s%s"%(partner_id, path, timest)

signature = hmac.new(bytes( partner_key, 'utf-8'), msg = bytes(base_string , 'utf-8'), digestmod = hashlib.sha256).hexdigest()

url = host + path + "?partner_id=%s&timestamp=%s&sign=%s&redirect=%s"%(partner_id, timest, signature, redirect_url)


And here is the respond :

{
"request_id": "5e82043c27318f70007e4aca894f1365",
"error": "error_auth"
}

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