Product Object 
- productIdentifierstring - The string that identifies the product to the Apple App Store.
- localizedDescriptionstring - A description of the product.
- localizedTitlestring - The name of the product.
- pricenumber - The cost of the product in the local currency.
- formattedPricestring - The locale formatted price of the product.
- currencyCodestring - 3 character code presenting a product's currency based on the ISO 4217 standard.
- introductoryPriceProductDiscount (optional) - The object containing introductory price information for the product. available for the product.
- discountsProductDiscount[] - An array of discount offers
- subscriptionGroupIdentifierstring - The identifier of the subscription group to which the subscription belongs.
- subscriptionPeriodProductSubscriptionPeriod (optional) - The period details for products that are subscriptions.
- isDownloadableboolean - A boolean value that indicates whether the App Store has downloadable content for this product.- trueif at least one file has been associated with the product.
- downloadContentVersionstring - A string that identifies the version of the content.
- downloadContentLengthsnumber[] - The total size of the content, in bytes.