[Python] Bitunix Futures Trading Place Order Signature Error in Python ( 1007 )

I'm trying to integrate with the Bitunix API (https://openapidoc.bitunix.com/doc/common/introduction.html) using Python and Request. I implemented authentication and signature generation as per the documentation, but when I try to place an order, the API always responds with:

Below is just Bitunix class

import base64
import hashlib
import secrets
import time
import re
import requests
import json
from app.core.config import settings

class Bitunix:
def __init__(self):

self.api_key = settings.BITUNIX_API_KEY
self.api_secret = settings.BITUNIX_SECRET_KEY
self.base_url = "https://fapi.bitunix.com/api/v1/futures"

def sha256_hex(self, input_string):
return hashlib.sha256(input_string.encode('utf-8')).hexdigest()

def sign_request(self, nonce: str, timestamp: str, method: str, data: dict):
query_params = ""
body = ""
if data:
if method.lower() == "get":
data = {k: v for k, v in data.items() if v is not None}
query_params = '&'.join([f"{k}={v}" for k, v in sorted(data.items())])
query_params = re.sub(r'[^a-zA-Z0-9]', '', query_params).replace(' ', '')
if method.lower() == "post":
body = json.dumps(data).replace(" ", "")

digest_input = nonce + timestamp + self.api_key + query_params + body
digest = self.sha256_hex(digest_input)

sign_input = digest + self.api_secret
sign = self.sha256_hex(sign_input)
return sign

def create_long_order(self, entry_price: str, tp_price: str, sl_price: str):
print(f"create long order: {entry_price} {tp_price} {sl_price}")
tp_order_price = get_up_price(float(tp_price), 0.0001)
sl_order_price = get_down_price(float(sl_price), 0.0001)
data = {
"symbol":"BTCUSDT",
"side": "BUY",
"price": entry_price,
"qty": "0.001",
"tradeSide": "OPEN",
"orderType": "LIMIT",
"reduceOnly": False,
"effect": "GTC",
"tpPrice": tp_price,
"tpStopType": "MARK",
"tpOrderType": "LIMIT",
"tpOrderPrice": tp_order_price,
"slPrice": sl_price,
"slStopType": "MARK",
"slOrderType": "LIMIT",
"slOrderPrice": sl_order_price
}
method = "post"
timestamp = str(int(time.time() * 1000))
random_bytes = secrets.token_bytes(32)
nonce = base64.b64encode(random_bytes).decode('utf-8')

sign = self.sign_request(nonce, timestamp, method, data)
url = f"{self.base_url}/trade/place_order"
headers = {
"api-key": self.api_key,
"sign": sign,
"nonce": nonce,
"timestamp": timestamp,
"language": "en-US",
"Content-Type": "application/json"
}
response = requests.request(method, url, headers=headers, data=data, timeout=10)
response_data = response.json()
return response_data


Below is code to call bitunix class:

@router.get("/webhook/bitunix")
async def test_hook(session: SessionDep):
ticker = bitunix.get_ticker("BTCUSDT")
entry_price = ticker.get('markPrice')
tp_price = str(float(entry_price) + 138)
sl_price = str(float(entry_price) - 138)
response_data = bitunix.create_long_order(entry_price, tp_price, sl_price)
return {
"status": "success",
"message": "Signal received",
"mark_price": entry_price,
"tp_price": tp_price,
"sl_price": sl_price
}


When I Run this code, I got below error:

{'code': 10007, 'data': None, 'msg': 'Signature Error'}

Could you please help me to solve this problem ?

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