# inAppPurchase

> In-app purchases on Mac App Store.

Process: [Main](../glossary.md#main-process)

## Events

The `inAppPurchase` module emits the following events:

### Event: 'transactions-updated'

Emitted when one or more transactions have been updated.

Returns:

* `event` Event
* `transactions` Transaction[] - Array of [`Transaction`](structures/transaction) objects.

## Methods

The `inAppPurchase` module has the following methods:


### `inAppPurchase.purchaseProduct(productID, quantity, callback)`

* `productID` String - The identifiers of the product to purchase. (The identifier of `com.example.app.product1` is `product1`).
* `quantity` Integer (optional) - The number of items the user wants to purchase.
* `callback` Function (optional) - The callback called when the payment is added to the PaymentQueue.
    * `isProductValid` Boolean - Determine if the product is valid and added to the payment queue.

You should listen for the `transactions-updated` event as soon as possible and certainly before you call `purchaseProduct`.

### `inAppPurchase.getProducts(productIDs, callback)`

* `productIDs` String[] - The identifiers of the products to get.
* `callback` Function - The callback called with the products or an empty array if the products don't exist.
    * `products` Product[] - Array of [`Product`](structures/product) objects

Retrieves the product descriptions.

### `inAppPurchase.canMakePayments()`

Returns `true` if the user can make a payment and `false` otherwise.

### `inAppPurchase.getReceiptURL()`

Returns `String`, the path to the receipt.


### `inAppPurchase.finishAllTransactions()`

Completes all pending transactions.


### `inAppPurchase.finishTransactionByDate(date)`

* `date` String - The ISO formatted date of the transaction to finish.

Completes the pending transactions corresponding to the date.