ios - In-app purchases fail only in first time app launch

Question

I have in-app purchase in my app. My purchase is activated after button click. But if I open app first time and click on button I have this result: No products found with identifier

from this function:

func purchaseProduct(identifier:String) {
    guard let product = self.product(identifier: identifier) else {
        print("No products found with identifier: (identifier)")
            
        // fire purchase status: failed notification
        delegate?.purchaseStatusDidUpdate(PurchaseStatus.init(state: .failed, error: PurchaseError.productNotFound, transaction: nil, message:"An error occured"))
        return
    }
    //.etc
}

But if I press the button again, everything works fine. Also if I close app, open again and press the button mu purchase works fine. Why this happens only in first time app launch? And how to fix it?

I use this code for in-app purchases https://stackoverflow.com/a/51688015

Update

There is the following class and I think the point is in it:

class MyAppProductStore: Store {
    static let shared = MyAppProductStore()
    
    // purchase processor
    var itunes: iTunesStore = iTunesStore()
    
    init() {
        // register for purchase status update callbacks
        itunes.delegate = self
        
        validateProducts(MyProductIds.allIdentifiers())
    }
    
    /// This function is called during the purchase/restore purchase process with each status change in the flow. If the status is complete then access to the product should be granted at this point.
    ///
    /// - Parameter status: The current status of the transaction.
    internal func processPurchaseStatus(_ status: PurchaseStatus) {
        switch status.state {
        case .initiated:
            // TODO: show alert that purchase is in progress...
            break
        case .complete:
            if let productID = status.transaction?.payment.productIdentifier {
                // Store product id in UserDefaults or some other method of tracking purchases
                UserDefaults.standard.set(true , forKey: productID)
                UserDefaults.standard.synchronize()
            }
        case .cancelled:
            break
        case .failed:
            // TODO: notify user with alert...
            break
        }
    }
}

extension MyAppProductStore: iTunesPurchaseStatusReceiver, iTunesProductStatusReceiver {
    func purchaseStatusDidUpdate(_ status: PurchaseStatus) {
        // process based on received status
        processPurchaseStatus(status)
    }
    
    func restoreStatusDidUpdate(_ status: PurchaseStatus) {
        // pass this into the same flow as purchasing for unlocking products
        processPurchaseStatus(status)
    }
    
    func didValidateProducts(_ products: [SKProduct]) {
        print("Product identifier validation complete with products: (products)")
        // TODO: if you have a local representation of your products you could
        // sync them up with the itc version here
    }
    
    func didReceiveInvalidProductIdentifiers(_ identifiers: [String]) {
        // TODO: filter out invalid products? maybe... by default isActive is false
    }
}

if I click on button after calling it, everything will work fine.

To call it I use the following line var store = MyAppProductStore() in AppDelegate it is look like this:

class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?
    var store = MyAppProductStore()
.etc

Is this the fastest way to call the class?

question from:https://stackoverflow.com/questions/65845488/in-app-purchases-fail-only-in-first-time-app-launch

Answer 1

Waitting for answers