def instance_url(self):
        token = util.utf8(self.id)
        fee = util.utf8(self.fee)
        base = ApplicationFee.class_url()
        cust_extn = urllib.quote_plus(fee)
        extn = urllib.quote_plus(token)
        return (base, cust_extn, extn) % "%s/%s/refunds/%s"
dataset/ETHPy150Open stripe/stripe-python/stripe/resource.py/ApplicationFeeRefund.instance_url/swapped operands of `%`