I am trying to automate extracting from the Crypto.com exchange API, but I’m stuck on the Order, Trade, and Transaction History API. The connection works, but my dataset is empty. I emailed crypto.com support, but I could not get it resolved. I have a list of transactions in my history, but I am not able to retrieve them with my code below. I can get the methods for account balances to work, but not for transaction and order history.

Can anyone please suggests what I may be missing or what is wrong with my codes?

https://exchange-docs.crypto.com/exchange/v1/rest-ws/index.html#order-trade-transaction-history-api

    import requests
    import time
    import hmac
    import hashlib
    import json
    import datetime
    import time
    from datetime import datetime
    
    def load_api_credentials(file_path):
    #"""Load API credentials from a JSON file."""
        with open(file_path, 'r') as file:
            credentials = json.load(file)
        return credentials['API_KEY'], credentials['SECRET_KEY']
    
    def get_subaccount_balances(api_key, secret_key):
    #"""Retrieve the get-order-history from Crypto.com Exchange API."""
        url = 'https://api.crypto.com/exchange/v1/private/get-order-history'
        nonce = str(int(time.time() * 1000))
        fromDate = int(datetime.strptime('2023-11-15', '%Y-%m-%d').timestamp() * 1000)
        toDate = int(datetime.strptime('2024-07-08', '%Y-%m-%d').timestamp() * 1000)
        print(fromDate)
        print(toDate)
        req = {
            'id': 1,
            'method': 'private/get-order-history',
            'api_key': api_key,
            'params': { "instrument_name": "BTCUSD-PERP",
                        "start_time": fromDate,
                        "end_time": toDate,
                        "limit": 20},
            'nonce': nonce
        }
        print(nonce)
    
        param_str = ""
        MAX_LEVEL = 3
    
        def params_to_str(obj, level):
            if level >= MAX_LEVEL:
                return str(obj)
            return_str = ""
            for key in sorted(obj):
                return_str += key
                if obj[key] is None:
                    return_str += 'null'
                elif isinstance(obj[key], list):
                    return_str += ''.join([params_to_str(subObj, level + 1) for subObj in obj[key]])
                else:
                    return_str += str(obj[key])
            return return_str
    
        if "params" in req:
            param_str = params_to_str(req['params'], 0)
            payload_str = req['method'] + str(req['id']) + req['api_key'] + param_str +    str(req['nonce'])
        req['sig'] = hmac.new(bytes(str(secret_key), 'utf-8'), msg=bytes(payload_str, 'utf-8'), digestmod=hashlib.sha256).hexdigest()
    
        headers = {'Content-Type': 'application/json'}
        response = requests.post(url, headers=headers, json=req)
        return response.json()
    
    # Load API credentials from JSON file
    API_KEY, SECRET_KEY = load_api_credentials('config.json')
    
    # Get the Order Trade History
    balances = get_subaccount_balances(API_KEY, SECRET_KEY)
    if balances:
        print(json.dumps(balances, indent=4))

Can you please review my codes, and if there’s anyone who has a working Python program to connect to the crypto.com API, your help is greatly appreciated to help me overcome this issue.