因此，我一直在尝试为MEXC编写一个撤回函数，但无法传递响应：'code'：700004，'msg'：“Mandatory parameter 'signature' was not sent，was empty/null，or malformed."}
我尝试了很多修改，但似乎没有一个对我有用。
下面是我的代码：

import requests
import hmac
from urllib.parse import urlencode, quote
from collections import OrderedDict
import hashlib
from datetime import datetime
import time
access_key = "(MY_ACCESS_KEY)"
secret_key = "(MY_SECRET_KEY)"
def generate_signature(api_key, api_secret, req_time, sign_params=None):
    if sign_params:
        sign_params = urlencode(sign_params, quote_via=quote)
        to_sign = f"{api_key}{req_time}{sign_params}"
    else:
        to_sign = f"{api_key}{req_time}"
    sign = hmac.new(api_secret.encode('utf-8'), to_sign.encode('utf-8'), hashlib.sha256).hexdigest()
    return sign
url = "https://api.mexc.com/api/v3/capital/withdraw/apply"
req_time = datetime.now().strftime("%Y-%m-%d %H:%M:%S")
symbol = "(MY_SYMBOL)"
balance = (MY_AMOUNT)
quantity = 0.5
signature = generate_signature(access_key, secret_key, req_time)
sign_params = {
    #'api-key': access_key,
    "symbol": symbol,
    "network": "(MY_NETWORK)",
    "address": "(MY_ADDRESS)",
    "memo": "(MY_MEMO)",
    "amount": str(balance)
}
headers = {
    "apiKey": access_key,
    "symbol": symbol,
    "network": (MY_NETWORK),
    "address": "(MY_ADDRESS)",
    "memo": "(MY_MEMO)",
    "amount": str(balance),
    "signature": signature
}
response = requests.get(url, headers=headers).json()
print(response)

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（代码中有一些垃圾，来自一些不起作用的方法）我真的很感激任何帮助！