productIdentifier String - The string that identifies the product to the Apple App Store.
localizedDescription String - A description of the product.
localizedTitle String - The name of the product.
contentVersion String - A string that identifies the version of the content.
contentLengths Number - The total size of the content, in bytes.
price Number - The cost of the product in the local currency.
formattedPrice String - The locale formatted price of the product.
currencyCode String - 3 character code presenting a product's currency based on the ISO 4217 standard.
isDownloadable Boolean - A Boolean value that indicates whether the App Store has downloadable content for this product.
true if at least one file has been associated with the product.