// Sandbox mode, Optionally add callbacks
                store.inappbilling.setTestMode(function () {
                        //successfully loaded test data
                        console.log("Success");
                    },
                    function () {
                        //failed to load test data
                        console.log("Failed");
                    });

                store.register({
                    id: productId,
                    type: store.PAID_SUBSCRIPTION
                });

                // Listen to the 'updated' event for individual product
                store.when(productId).updated(function (p) {
                    $ionicLoading.hide();
                });

                // Initiate a purchase
                store.order(productId);

                // When the purchase is approved, show an alert
                store.when(productId).approved(function (order) {
                    Store.subscribeWindows(month, order);
                    order.finish();
                });

                // When the purchase is approved, show an alert
                store.when(productId).cancelled(function (order) {
                    $ionicPopup.alert({
                        title: 'Subscribe was cancelled!',
                        template: 'Try again!'
                    });
                    order.finish();
                });

                // When the store is ready all products are loaded and in their "final" state.
                store.ready(function () {
                    console.log("The store is ready");
                });

                // Deal with errors:
                store.error(function (err) {
                    $ionicLoading.hide();
                    $ionicPopup.alert({
                        title: 'Something went wrong',
                        template: err.message
                    });
                })


                // This will contact the server to check all registered products validity and ownership status.
                // It's mostly fine to do this only at application startup but you can refresh it more often.
                store.refresh();