Working with In-App Purchases

let productIdentifier = "com.example.myapp.premium"

import StoreKit

class ProductManager: ObservableObject {
    @Published var products: [Product] = []
    
    func fetchProducts() {
        Task {
            do {
                let storeProducts = try await Product.fetch(
                    .subscription("premium_subscription")
                )
                self.products = storeProducts
            } catch {
                print("Failed to fetch products: \(error)")
            }
        }
    }
}

import StoreKit

func purchase(_ product: Product) {
    Task {
        do {
            let result = try await product.purchase()
            switch result {
            case .success(let verification):
                // Handle successful purchase
                print("Purchase verified: \(verification)")
            case .userCancelled:
                print("User cancelled purchase")
            case .pending:
                print("Purchase is pending")
            @unknown default:
                print("Unknown purchase result")
            }
        } catch {
            print("Purchase failed: \(error)")
        }
    }
}

import StoreKit

func verifyPurchase(_ verification: VerificationResult<Transaction>) {
    guard case .success = verification else { return }
    
    // Send receipt to your server for validation
    Task {
        let receipt = await Transaction.currentReceipt
        // Upload receipt to your server for verification
    }
}

import StoreKit

class ProductManager: ObservableObject {
    @Published var products: [SKProduct] = []
    
    func fetchProducts() {
        let productIdentifiers = ["com.example.product1", "com.example.product2"]
        let set = Set(productIdentifiers)
        
        SKProductsRequest(productsRequest: set).start { [weak self] response in
            guard let products = response.products else { return }
            self?.products = products
        }
    }
}

func paymentQueue(_ queue: SKPaymentQueue, updatedTransactions transactions: [SKPaymentTransaction]) {
    for transaction in transactions {
        switch transaction.transactionState {
        case .purchased:
            print("Purchase successful: \(transaction.payment.productIdentifier)")
            // Deliver content to user
        case .failed:
            print("Purchase failed: \(transaction.error?.localizedDescription ?? "")")
        case .restored:
            print("Purchase restored: \(transaction.payment.productIdentifier)")
        case .deferred:
            print("Purchase deferred")
        default:
            break
        }
    }
}

import StoreKit

class PurchaseManager: NSObject, SKPaymentTransactionObserver {
    func restorePurchases() {
        SKPaymentQueue.default().restoreCompletedTransactions()
    }

    func paymentQueue(_ queue: SKPaymentQueue, updatedTransactions transactions: [SKPaymentTransaction]) {
        for transaction in transactions {
            switch transaction.transactionState {
            case .restored:
                // Handle restored purchase
                print("Restored: \(transaction.payment.productIdentifier)")
            case .failed:
                // Handle failed restore
                print("Restore failed: \(transaction.error?.localizedDescription ?? "")")
            default:
                break
            }
        }
    }
}

import StoreKit

class SubscriptionManager: ObservableObject {
    @Published var products: [Product] = []
    
    func fetchProducts() async throws {
        let products = try await Product.fetchAll()
        self.products = products.filter { $0.type == .autoRenewable }
    }
}

func purchaseSubscription(_ product: Product) async throws {
    let result = try await product.purchase()
    
    switch result {
    case .success(let transaction):
        // Handle successful purchase
        await transaction.finish()
    case .userCancelled:
        // Handle user cancellation
        break
    default:
        // Handle other cases
        break
    }
}

func manageSubscription() {
    Task {
        do {
            let updates = try await StoreKit.Transaction.currentEntitlements
            for update in updates {
                if update.productType == .autoRenewable {
                    // Check renewal status
                    let renewalInfo = update.renewalInfo
                    if renewalInfo.isInGracePeriod {
                        // Handle grace period logic
                    }
                }
            }
        } catch {
            print("Failed to fetch entitlements: \(error)")
        }
    }
}

import StoreKit

class ReceiptValidator: ObservableObject {
    @Published var receiptStatus: String = "Not validated"
    
    func validateReceipt() {
        guard let appStoreReceiptURL = Bundle.main.appStoreReceiptURL else {
            receiptStatus = "No receipt found"
            return
        }
        
        do {
            let receiptData = try Data(contentsOf: appStoreReceiptURL)
            let receiptString = receiptData.base64EncodedString()
            
            // Send to your server for validation
            // Example API call:
            // sendToServer(receiptString)
            
            receiptStatus = "Receipt validated successfully"
        } catch {
            receiptStatus = "Failed to read receipt: \(error.localizedDescription)"
        }
    }
}

import Foundation

struct ReceiptVerificationRequest: Codable {
    let receiptData: String
    let password: String?
}

struct ReceiptVerificationResponse: Codable {
    let status: Int
    let receipt: Receipt?
    let latestReceipt: String?
}

struct Receipt: Codable {
    let bundleId: String
    let applicationVersion: String
    let inAppPurchases: [InAppPurchase]?
}

struct InAppPurchase: Codable {
    let productId: String
    let transactionId: String
    let originalTransactionId: String?
    let purchaseDate: Date
    let originalPurchaseDate: Date?
}

func verifyReceiptWithServer(
    receiptData: Data,
    appBundleId: String,
    appVersion: String,
    serverURL: URL,
    completion: @escaping (Result<ReceiptVerificationResponse, Error>) -> Void
) {
    guard let receiptString = receiptData.base64EncodedString().addingPercentEncoding(withAllowedCharacters: .alphanumerics) else {
        completion(.failure(NSError(domain: "ReceiptEncodingError", code: 0)))
        return
    }

    let request = ReceiptVerificationRequest(
        receiptData: receiptString,
        password: "your-shared-secret"
    )

    var urlRequest = URLRequest(url: serverURL)
    urlRequest.httpMethod = "POST"
    urlRequest.httpBody = try? JSONEncoder().encode(request)
    urlRequest.setValue("application/json", forHTTPHeaderField: "Content-Type")

    let task = URLSession.shared.dataTask(with: urlRequest) { data, response, error in
        if let error = error {
            completion(.failure(error))
            return
        }

        guard let data = data else {
            completion(.failure(NSError(domain: "NoDataError", code: 0)))
            return
        }

        do {
            let result = try JSONDecoder().decode(ReceiptVerificationResponse.self, from: data)
            completion(.success(result))
        } catch {
            completion(.failure(error))
        }
    }

    task.resume()
}

import StoreKit

class ProductManager: ObservableObject {
    @Published var products: [SKProduct] = []
    
    func fetchProducts() {
        let productIdentifiers = Set(["com.example.product1", "com.example.product2"])
        let request = SKProductsRequest(productIdentifiers: productIdentifiers)
        request.delegate = self
        request.start()
    }
}

extension ProductManager: SKProductsRequestDelegate {
    func productsRequest(_ request: SKProductsRequest, didReceive response: SKProductsResponse) {
        self.products = response.products
    }
}

import StoreKit

func purchaseProduct(_ product: SKProduct) {
    guard let discount = product.priceLabeledDiscount else { return }
    
    let payment = SKPayment(product: product)
    payment.applicationUsername = "user123"
    payment.paymentDiscount = discount
    
    SKPaymentQueue.default().add(payment)
}

import StoreKit

class PurchaseManager: ObservableObject {
    @Published var products: [SKProduct] = []
    
    func loadProducts() async throws {
        let productIdentifiers = ["com.example.product1", "com.example.product2"]
        let products = try await SKProductsRequest(products: productIdentifiers).products
        self.products = products
    }
    
    func purchase(_ product: SKProduct) async throws {
        let result = try await SKPaymentQueue.default().addPayment(product)
    }
}

import StoreKit

func simulatePurchase() {
    let payment = SKPayment(product: product)
    SKPaymentQueue.default().add(payment)
    
    // Handle transaction in delegate
    func paymentQueue(_ queue: SKPaymentQueue, updatedTransactions transactions: [SKPaymentTransaction]) {
        for transaction in transactions {
            switch transaction.transactionState {
            case .purchased:
                print("Purchase successful")
                SKPaymentQueue.default().finishTransaction(transaction)
            case .failed:
                print("Purchase failed")
                SKPaymentQueue.default().finishTransaction(transaction)
            default:
                break
            }
        }
    }
}