In-App-Purchase: Estratégias e Implementações

import StoreKit

// Request a product
let productIdentifiers = ["com.example.inapp.product"]
let request = SKProductsRequest(productIdentifiers: productIdentifiers)
request.delegate = self
request.start()

// MARK: - SKProductsRequestDelegate
func productsRequest(_ request: SKProductsRequest, didReceive response: SKProductsResponse) {
    if response.products.count > 0 {
        let product = response.products[0]
        let priceLocalized = product.priceLocale.currencyCode! + " " + product.price.floatValue as NSNumber?.stringValue
        print(priceLocalized)
    }
}

val billingClient = BillingClient.newBuilder(this).setListener(object : PurchasesUpdatedListener {
    override fun onPurchasesUpdated(responseCode: Int, purchases: MutableList<Purchase>?) {
        if (responseCode == BillingClient.BillingResponseCode.OK && purchases != null) {
            for (purchase in purchases) {
                val purchaseDetails = BillingFlowParams.ProductItem.newBuilder().setSku(purchase.sku).build()
                println("Purchase Successful: " + purchase.sku)
            }
        }
    }
}).build()
billingClient.startConnection(object : BillingClientStateListener {
    override fun onBillingServiceDisconnected() {}
    override fun onBillingServiceConnected() {
        billingClient.queryPurchasesAsync(BillingClient.ProductType.INAPP, object : PurchasesResponseListener {
            override fun onPurchasesResponse(billingResult: BillingResult, purchasesList: MutableList<Purchase>?) {
                if (billingResult.responseCode == BillingClient.BillingResponseCode.OK && purchasesList != null) {
                    // Handle the purchases
                }
            }
        })
    }
})