ALBERT SITE

애플 인앱결제 가이드: 

https://developer.apple.com/documentation/storekit/in-app_purchase/original_api_for_in-app_purchase/loading_in-app_product_identifiers

https://www.revenuecat.com/blog/engineering/ios-in-app-subscription-tutorial-with-storekit-2-and-swift/'h-step-1-listing-products

1import Foundation
2import StoreKit
3
4@MainActor
5class PurchaseManager: ObservableObject {
6
7    private let productIds = ["pro_monthly", "pro_yearly", "pro_lifetime"]
8
9    @Published
10    private(set) var products: [Product] = []
11    private var productsLoaded = false
12
13    func loadProducts() async throws {
14        guard !self.productsLoaded else { return }
15        self.products = try await Product.products(for: productIds)
16        self.productsLoaded = true
17    }
18
19    func purchase(_ product: Product) async throws {
20        let result = try await product.purchase()
21
22        switch result {
23        case let .success(.verified(transaction)):
24            // Successful purhcase
25            await transaction.finish()
26        case let .success(.unverified(_, error)):
27            // Successful purchase but transaction/receipt can't be verified
28            // Could be a jailbroken phone
29            break
30        case .pending:
31            // Transaction waiting on SCA (Strong Customer Authentication) or
32            // approval from Ask to Buy
33            break
34        case .userCancelled:
35            // ^^^
36            break
37        @unknown default:
38            break
39        }
40    }
41}
https://www.revenuecat.com/blog/engineering/ios-in-app-subscription-tutorial-with-storekit-2-and-swift/'h-step-1-listing-products