bithumb Api error -{'status': '5100', 'message': 'Bad Request.(Auth Data)'} - python-3.x

Question

I wanted to make a program where I can check the order details of my order at Bithumb Exchange.
So I looked at the docs(https://api.bithumb.com/info/orders) and made it, but the same error code kept coming out, so I don't know what to do.
import time
import math
import base64
import hmac, hashlib
import urllib.parse
import requests
class XCoinAPI:
api_url = "https://api.bithumb.com";
api_key = "";
api_secret = "";
def __init__(self, api_key, api_secret):
self.api_key = api_key;
self.api_secret = api_secret;
def body_callback(self, buf):
self.contents = buf;
def microtime(self, get_as_float = False):
if get_as_float:
return time.time()
else:
return '%f %d' % math.modf(time.time())
def usecTime(self) :
mt = self.microtime(False)
mt_array = mt.split(" ")[:2];
return mt_array[1] + mt_array[0][2:5];
def xcoinApiCall(self, endpoint, rgParams):
# 1. Api-Sign and Api-Nonce information generation.
# 2. Request related information from the Bithumb API server.
#
# - nonce: it is an arbitrary number that may only be used once.
# - api_sign: API signature information created in various combinations values.
endpoint_item_array = {
"endpoint" : endpoint
}
uri_array = dict(endpoint_item_array, **rgParams) # Concatenate the two arrays.
str_data = urllib.parse.urlencode(uri_array)
nonce = self.usecTime()
data = endpoint + chr(1) + str_data + chr(1) + nonce
utf8_data = data.encode('utf-8')
key = self.api_secret
utf8_key = key.encode('utf-8')
h = hmac.new(bytes(utf8_key), utf8_data, hashlib.sha512)
hex_output = h.hexdigest()
utf8_hex_output = hex_output.encode('utf-8')
api_sign = base64.b64encode(utf8_hex_output)
utf8_api_sign = api_sign.decode('utf-8')
headers = {
"Accept": "application/json",
"Content-Type": "application/x-www-form-urlencoded",
"Api-Key": self.api_key,
"Api-Nonce": nonce,
"Api-Sign": utf8_api_sign
}
url = self.api_url + endpoint
r = requests.post(url, headers=headers, data=uri_array)
return r.json()
a = XCoinAPI(api_key="MYKEY1c", api_secret="MYKEY2")
aa= a.xcoinApiCall("/info/orders",{"order_currency":"LN","payment_currency":"BTC"})
print(aa)
{'status': '5100', 'message': 'Bad Request.(Auth Data)'}
Process finished with exit code 0
The error code 5100, bad request keeps coming up(https://apidocs.bithumb.com/docs/api-%EC%A3%BC%EC%9A%94-%EC%97%90%EB%9F%AC-%EC%BD%94%EB%93%9C)
I really don't know which code to modify.
I think it's a parameter problem with XcoinApiCall, but I don't know.