*`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.