def get_api_key(exchange):
    if exchange=="binance":
        api_key = "place_your_api_key_here"
        api_secret = "place_your_api_secret_here"
        return api_key, api_secret
    elif exchange=="kucoin":
        api_key = "place_your_api_key_here"
        api_secret = "place_your_api_secret_here"
        api_passphrase = "place_your_passphrase_here"
        return api_key, api_secret, api_passphrase
    elif exchange=="okx":
        api_key = "place_your_api_key_here"
        api_secret = "place_your_api_secret_here"
        api_passphrase = "place_your_passphrase_here"
        return api_key, api_secret, api_passphrase
    elif exchange=="gateio":
        api_key = "place_your_api_key_here"
        api_secret = "place_your_api_secret_here"
        return api_key, api_secret
    else:
        return None,None