how to define paymenthod in nodejs stripe code example

Example: stripe subscription node js

var stripe = require('stripe')('sk_test_FceQdct2QZpFfQZC4Wx9hGeo00ghaTeqAc');

stripe.subscriptions.create(
  {
    customer: 'cus_HKZRMeUnGPOb66',
    items: [{price: 'gold'}],
  },
  function(err, subscription) {
    // asynchronously called
  }
);