 
		
	This class implements In App Purchases for Apples App Store. Note that you have to set up all products in iTunesConnect first – with the correct bundle identifier as specified in your in Info.plist.
var iap = new Ejecta.IAPManager();
// Request the 'shotgun' and 'plasmagun' products
iap.getProducts( ['shotgun', 'plasmagun'], function(error, products) {
	if( error ) {
		console.log( error );
	}
	else {
		// Log all product info and search for the shotgun
		var shotgun = null;
		for( var i = 0; i < products.length; i++ ) {
			console.log(
				products[i].id,
				products[i].title,
				products[i].description, 
				products[i].price
			);
			if( products[i].id == 'shotgun' ) {
				shotgun = products[i];
			}
		}
		// Buy 1 shotgun
		shotgun.purchase(1, function(error, transaction) {
			if( error ) {
				console.log(error);
			}
			else {
				// Purchase successful; log some transaction info
				console.log(
					transaction.productId,
					transaction.id,
					transaction.receipt
				);
			}
		});
	}
});
// Call this to restore all transaction - i.e. when the user re-installs
// your app on a new device
iap.restoreTransactions(function(error, transactions) {
	if( error ) {
		console.log( error );
	}
	else {
		for( var i = 0; i < transactions.length; i++ ) {
			console.log(
				transactions[i].productId,
				transactions[i].id,
				transactions[i].receipt 
			);
		}
	}
});
Load the products with the given products IDs.
The supplied callback function is called with an error parameter that is either null or a localized error string. On success, the second parameter is an array of IAPProducts.
Restores all transactions for the current User account. Apple requires this option to be present in your App. The user should be able to call this function (e.g. through a menu button) when he re-installs the App on his device.
The supplied callback function is called with an error parameter that is either null or a localized error string. On success, the seccond parameter is an array of IAPTransactions.
The localized description of the product, as specified in iTunesConnect.
The ID name of the product, as specified in iTunesConnect.
The localized price string, e.g. $0.99 or 0.79€.
Purchases the given quantity of the IAPProduct.
The supplied callback function is called with an error parameter that is either null or a localized error string.
On success, the seccond parameter is an instance of IAPTransaction.
The unique ID of this transaction
The product ID associated with this transaction
The transaction's receipt as Base64 encoded string.