关于IOS应用商店和Google商店促销代码

import StoreKit

class PromoCodeManager: NSObject, SKPaymentTransactionObserver {
    
    func applyPromoCode(_ code: String) {
        let payment = SKMutablePayment(product: yourProduct)
        payment.applicationUsername = code
        SKPaymentQueue.default().add(payment)
    }
    
    func paymentQueue(_ queue: SKPaymentQueue, updatedTransactions transactions: [SKPaymentTransaction]) {
        for transaction in transactions {
            switch transaction.transactionState {
            case .purchased:
                // Handle successful purchase
                SKPaymentQueue.default().finishTransaction(transaction)
            case .failed:
                // Handle failed purchase
                SKPaymentQueue.default().finishTransaction(transaction)
            case .restored:
                // Handle restored purchase
                SKPaymentQueue.default().finishTransaction(transaction)
            default:
                break
            }
        }
    }
}