Refund Amount

gistfile1.js

 /**
         *
         * @param chargeId
         */
        refundChargeById: function (chargeId) {

            var amount = 300; // this causes an undefined params error even though the underlying method doesn't expect {}
            stripe.charges.refund(chargeId, amount,
                function (err, refund) {

                    (err) ? console.log(err) : console.log(refund);
                });
        }