def bid(currency_code, price, amount, limit = nil, counter_currency_code = "jpy")
            return trade(currency_code, price, amount, "bid", limit, counter_currency_code)
        end
def bid(currency_code, price, amount, limit = nil, counter_currency_code = "jpy")
            return trade(currency_code, price, amount, "bid", limit, counter_currency_code)
        end
Issue bid order.
 Need api key.