InAppPurchase

(js) interface InAppPurchase : EventEmitter

(js) addListener	`abstract fun addListener(event: String, listener: (event: Event, transactions: Array<Transaction>) -> Unit): InAppPurchase`
(js) canMakePayments	`abstract fun canMakePayments(): Boolean`
(js) getReceiptURL	`abstract fun getReceiptURL(): String`
(js) on	`abstract fun on(event: String, listener: (event: Event, transactions: Array<Transaction>) -> Unit): InAppPurchase`
(js) once	`abstract fun once(event: String, listener: (event: Event, transactions: Array<Transaction>) -> Unit): InAppPurchase`
(js) purchaseProduct	`abstract fun purchaseProduct(productID: String, quantity: Number? = definedExternally, callback: ((isProductValid: Boolean) -> Unit)? = definedExternally): Unit`
(js) removeListener	`abstract fun removeListener(event: String, listener: (event: Event, transactions: Array<Transaction>) -> Unit): InAppPurchase`