Swift3 - Get transaction date when restoring In-App Purchase Transactions - ios

Question

i am trying to restore in-app purchase (non-renewing subscription) in case a user installs the app on a new phone or re-installs it on his phone. I want to get the original purchase date for an in-app purchase using the method
func paymentQueueRestoreCompletedTransactionsFinished(_ queue: SKPaymentQueue) {
for transaction in queue.transactions{
let t : SKPaymentTransaction = transaction
let prodID = t.payment.productIdentifier as String
print("transaction finished",prodID)
if(prodID == "com.netvariant.FamousFaces.FullAccess"){
print(">>>>>>>>>>>>>", t.original?.transactionDate)
print(">>>>>>>>>>>>>", t.transactionDate)
defaults.set("Y", forKey: "adPurchase")
NotificationCenter.default.post(name: Notification.Name(rawValue: "removeAds"), object: nil)
print("working")
}
}
}
The problem is transaction date in returning nil in both cases. What did i miss in the code ? and is this the best way to handle restored purchases?
I want to get the date to calculate if the users's subscription period (1 month) is over or not. The restore is successful but as i mentioned the date in nil.
Thank you.

Answer 1

You can use SwiftyStoreKit for verify and Perform InApp Purchase. Below code for verify InApp purchase is expired or not. For User this code, your SwiftyStoreKit in your project.
let appleValidator = AppleReceiptValidator(service: .production)
SwiftyStoreKit.verifyReceipt(using: appleValidator, password: "Enter your inapp secret key") { result in
switch result {
case .success(let receipt):
// Verify the purchase of a Subscription
let purchaseResult = SwiftyStoreKit.verifySubscription(
type: .autoRenewable, // or .nonRenewing (see below)
productId: "Enter your inapp product key",
inReceipt: receipt)
switch purchaseResult {
case .purchased(let expiryDate, _):
print("Product is valid until \(expiryDate)")
case .expired(let expiryDate, _):
print("Product is expired since \(expiryDate)")
case .notPurchased:
print("The user has never purchased this product")
}
case .error(let error):
print("Receipt verification failed: \(error)")
}
}