How to ascribe initial values for a subscription's pricing components (using BillForward NodeJS SDK)

scratch.js

var BillForward = require('BillForward');
var _ = require('lodash'); // lodash is the strongest
var Q = require('q');

var config = {
	"urlRoot":     "https://api-sandbox.billforward.net:443/v1/",
	"accessToken": "INSERT ACCESS TOKEN HERE",
	// longStack: true,
	"requestLogging": true,
	"responseLogging": false,
	"errorLogging": true,
};

BillForward.Client.makeDefault(config);

Q.spread([
	BillForward.Account.getAll({records:1}),
	BillForward.ProductRatePlan.getAll({records:1}),
	],
	function(accounts, ratePlans) {
		// get 'an account' moreorless at random
		var account = accounts[0];
		// get 'a rate plan' moreorless at random
		var plan = ratePlans[0];

		// we can only set initial values for (at least, but not limited to) 'subscription' pricing components
		var advanceComponents = _.where(plan.pricingComponents,
			{
				'chargeType': 'subscription' // btw 'subscription' is also known as "in-advance"
				// if you set this to 'usage', we get ServerError!
			});

		var advanceComponentNames = _.pluck(advanceComponents, 'name');
		var advanceComponentValues = _.pluck(advanceComponents, 'defaultQuantity');

		var componentNameToValueMap = _.zipObject(advanceComponentNames, advanceComponentValues);

		var subscriptionModel = new BillForward.Subscription({
		    'productRatePlanID': plan.id,
		    'accountID': account.id,
		    'name': plan.description,
		    'description': plan.description
		});

		return subscriptionModel.setValuesOfPricingComponentsByName(componentNameToValueMap);
	})
	.then(function(subscriptionModel) {
		return BillForward.Subscription.create(subscriptionModel);
	})
	.then(function(subscription) {
		console.log(subscription.toString());
	})
	.catch(function(e) {
	  if (e instanceof BillForward.BFError) // generic parent class for handled exceptions in SDK
	    console.error("Something went wrong.");
	  if (e instanceof BillForward.BFRequestError)
	    console.error("API did not like our request; failed to fulfil it.");
	  if (e instanceof BillForward.BFHTTPError)
	    console.error("Connection problem; maybe your BillForward URL or API endpoint is funky?");
	  if (e instanceof BillForward.BFInvocationError)
	    console.error("We are invoking BillForward incorrectly.");
	  if (e instanceof BillForward.MalformedAPIResponseError)
	    console.error("Did not receive standard JSON response we expect. Maybe our BillForward URL or API endpoint is funky?");
	  if (e instanceof BillForward.BFResponseUnserializationFailure)
	    console.error("Did not receive a JSON-formatted entity, when we expected one.");
	  if (e instanceof BillForward.BFUnauthorizedError)
	    console.error("Try logging in :P");
	  console.error(e.toString(), e.stack);
	})
	.done(); // throws unhandled errors also