StoreKit

storekit.swift

func foo(_ a: SKProductsResponse) {
  _ = a.invalidProductIdentifiers
  _ = a.products
}

// APi
protocol ApiStoreKitProtocol {
  func fetchProducts(_ productsIdentifiers: Set<String>) -> SFProductsResponse
}

struct SFProductsResponse {
  let invalidProductIdentifiers: [String]
  let products: [SFProduct]
}


// Domain
struct SFPaymentTransaction {
  /// An object describing the error that occurred while processing the transaction.
  let error: NSError?

  let rawValue: SKPaymentTransaction?

  /// The payment for the transaction.
  /// Each payment transaction is created in response to a payment that your application added to the payment queue.
  let payment: SFPayment

  /// The date the transaction was added to the App Store’s payment queue.
  let transactionDate: Date

  /// A string that uniquely identifies a successful payment transaction.
  let transactionIdentifier: String

  /// The current state of the transaction.
  /// case purchasing //A transaction that is being processed by the App Store.
  /// case purchased; /// A successfully processed transaction.
  /// case failed /// A failed transaction.
  /// case restored /// A transaction that restores content previously purchased by the user.
  /// case deferred /// A transaction that is in the queue, but its final status is pending external action such as Ask to Buy.
  let transactionState: SKPaymentTransactionState
}

struct SFPayment {
  /// A string used to identify a product that can be purchased from within your app.
  let productIdentifier: String

  /// The number of items the user wants to purchase. Max 10
  let quantity: Int

  /// A string that associates the payment transaction with a user on your service.
  let applicationUsername: String?

  /// A Boolean value that produces an "ask to buy" flow for this payment in the sandbox.
  let simulatesAskToBuyInSandbox: Bool
}


struct SFProduct {
  /// The string that identifies the product to the Apple App Store.
  let productIdentifier: String

  /// The title's language is determined by the storefront that the user's device is connected to,
  /// not the preferred language set on the device.
  let localizedTitle: String

  /// The description's language is determined by the storefront that the user's device is connected to,
  /// not the preferred language set on the device.
  let localizedDescription: String

  /// The cost of the product in the local currency.
  /// let numberFormatter = NumberFormatter()
  /// numberFormatter.numberStyle = .currency
  /// numberFormatter.locale = product.priceLocale
  /// let formattedString = numberFormatter.string(from: product.price)
  let price: NSDecimalNumber

  /// The locale used to format the price of the product.
  let priceLocale: Locale
}