Constructing and using an AngularJS promise

promise-sample.js

angular.module('app', [])
	.factory('FakeAmazonService', function($http, $q) {
		return {
			validateShippingAdddress: function(address) {
				var deferred = $q.defer();
				$http.post('/api/address/validate', address)
					.then(function(resp) {
						deferred.resolve({ success: true, data: resp});
					}),
					function(error) {
						deferred.reject({ success: false, data: error});
					});
				return deferred.promise;	
			},
			validateCreditCard : function(creditCard) {
				var deferred = $q.defer();
				$http.post('/api/creditCard/validate', creditCard)
					.success(function(data) {
						deferred.resolve({ isValid: data.success });
					})
					.error(function(error) {
						deferred.reject({isValid: false, reason: error});
					});

				return deferred.promise;
			},
			placeOrder: function(order) {
				var deferred = $q.defer();
				$http.post('/api/order', order)
					.success(function(data) {
						deferred.resolve({success: true, msg: data});
					})
					.error(function(error) {
						deferred.reject({success: false, msg: error});
					});
				return deferred.promise;
			},

		}
	})
	.controller('MainCtrl', function($scope, $q, FakeAmazonService, address, creditCard, order) {

		var shippingPromise = FakeAmazonService.validateShippingAdddress(address);
		var creditCardPromise = FakeAmazonService.validateCreditCard(creditCard);
		var orderPromise = FakeAmazonService.placeOrder(order);

		$q.all([creditCardPromise, shippingPromise, orderPromise]).then(function(responses) {
			var creditCardMsg= responses[0];
			var shippingMsg = responses[1];
			var orderMsg = responses[2];

			console.log('YAY!! Order Great Success!');
		});
	});