I am testing the auto renewable In-app purchases in swift, I found out that there are some strange problems with my code.
I am testing these functions in sandbox environment
After long research on the tutorials, I am still confused about the validation
My core problem is how can I check the validation of subscriptions with Apple every time when I open the app, I don't have a server, and I don't know why the receipt is not refreshing automatically
Here are some parts of my code, I call checkUserSubsriptionStatus() when I open the app, I am using TPInAppReceipt Library
class InAppPurchaseManager {
static var shared = InAppPurchaseManager()
init() {
}
public func getUserPurchaseType() -> PurchaseType {
if let receipt = try? InAppReceipt.localReceipt() {
var purchaseType: PurchaseType = .none
if let purchase = receipt.lastAutoRenewableSubscriptionPurchase(ofProductIdentifier: PurchaseType.oneMonth.productID) {
purchaseType = .oneMonth
}
if let purchase = receipt.lastAutoRenewableSubscriptionPurchase(ofProductIdentifier: PurchaseType.oneYear.productID) {
purchaseType = .oneYear
}
if receipt.containsPurchase(ofProductIdentifier: PurchaseType.permanent.productID) {
purchaseType = .permanent
}
return purchaseType
} else {
print("Receipt not found")
return .none
}
}
public func restorePurchase(in viewController: SKPaymentTransactionObserver) {
SKPaymentQueue.default().add(viewController)
if SKPaymentQueue.canMakePayments() {
SKPaymentQueue.default().restoreCompletedTransactions()
} else {
self.userIsNotAbleToPurchase()
}
}
public func checkUserSubsriptionStatus() {
DispatchQueue.main.async {
if let receipt = try? InAppReceipt.localReceipt() {
self.checkUserPermanentSubsriptionStatus(with: receipt)
}
}
}
private func checkUserPermanentSubsriptionStatus(with receipt: InAppReceipt) {
if let receipt = try? InAppReceipt.localReceipt() { //Check permsnent subscription
if receipt.containsPurchase(ofProductIdentifier: PurchaseType.permanent.productID) {
print("User has permament permission")
if !AppEngine.shared.currentUser.isVip {
self.updateAfterAppPurchased(withType: .permanent)
}
} else {
self.checkUserAutoRenewableSubsrption(with: receipt)
}
}
}
private func checkUserAutoRenewableSubsrption(with receipt: InAppReceipt) {
if receipt.hasActiveAutoRenewablePurchases {
print("Subsription still valid")
if !AppEngine.shared.currentUser.isVip {
let purchaseType = InAppPurchaseManager.shared.getUserPurchaseType()
updateAfterAppPurchased(withType: purchaseType)
}
} else {
print("Subsription expired")
if AppEngine.shared.currentUser.isVip {
self.subsrptionCheckFailed()
}
}
}
private func updateAfterAppPurchased(withType purchaseType: PurchaseType) {
AppEngine.shared.currentUser.purchasedType = purchaseType
AppEngine.shared.currentUser.energy += 5
AppEngine.shared.userSetting.hasViewedEnergyUpdate = false
AppEngine.shared.saveUser()
AppEngine.shared.notifyAllUIObservers()
}
public func updateAfterEnergyPurchased() {
AppEngine.shared.currentUser.energy += 3
AppEngine.shared.saveUser()
AppEngine.shared.notifyAllUIObservers()
}
public func purchaseApp(with purchaseType: PurchaseType, in viewController: SKPaymentTransactionObserver) {
SKPaymentQueue.default().add(viewController)
if SKPaymentQueue.canMakePayments() {
let paymentRequest = SKMutablePayment()
paymentRequest.productIdentifier = purchaseType.productID
SKPaymentQueue.default().add(paymentRequest)
} else {
self.userIsNotAbleToPurchase()
}
}
public func purchaseEnergy(in viewController: SKPaymentTransactionObserver) {
SKPaymentQueue.default().add(viewController)
let productID = "com.crazycat.Reborn.threePointOfEnergy"
if SKPaymentQueue.canMakePayments() {
let paymentRequest = SKMutablePayment()
paymentRequest.productIdentifier = productID
SKPaymentQueue.default().add(paymentRequest)
} else {
self.userIsNotAbleToPurchase()
}
}
}
If you do not have the possibility to use a server, you need to validate locally. Since you are already included TPInAppReceipt library, this is relatively easy.
To check if the user has an active premium product and what type it has, you can use the following code:
// Get all active purchases which are convertible to `PurchaseType`.
let premiumPurchases = receipt.activeAutoRenewableSubscriptionPurchases.filter({ PurchaseType(rawValue: $0.productIdentifier) != nil })
// It depends on how your premium access works, but if it doesn't matter what kind of premium the user has, it is enough to take one of the available active premium products.
// Note: with the possibility to share subscriptions via family sharing, the receipt can contain multiple active subscriptions.
guard let product = premiumPurchases.first else {
// User has no active premium product => lock all premium features
return
}
// To be safe you can use a "guard" or a "if let", but since we filtered for products conforming to PurchaseType, this shouldn't fail
let purchaseType = PurchaseType(rawValue: product.productIdentifier)!
// => Setup app corresponding to active premium product type
One point I notice in your code, which could lead to problems, is that you constantly add a new SKPaymentTransactionObserver. You should have one class conforming to SKPaymentTransactionObserver and add this only once on app start and not on every public call. Also, you need to remove it when you no longer need it (if you created it only once, you would do it in the deinit of your class, conforming to the observer protocol.
I assume this is the reason for point 2.
Technically, the behavior described in point 3 is correct because the method you are using asks the payment queue to restore all previously completed purchases (see here).
Apple states restoreCompletedTransactions() should only be used for the following scenarios (see here):
For your case, it is recommended to use a SKReceiptRefreshRequest, which requests to update the current receipt.