Which Apple Developer API and Google Developer API should I use to check a user's subscription status in a .NET MAUI mobile application?

I am working on .NET MAUI Mobile Application, and I need to check the subscription status of iOS and Android users to ensure access to premium features. The code successfully handles purchasing subscriptions, but I need to check the user’s subscription status through the Apple Developer API. The same way I need to check the user’s subscription status through the Google Developer API.

Here’s the relevant part of my code where I handle the subscription purchase:

private async void PlanClicked(Object sender, EventArgs e)
{
    UserDialogs.Instance.ShowLoading("");
    if (IsBusy)
        return;

    IsBusy = true;
    try
    {
        // check internet first with Essentials
        if (Connectivity.NetworkAccess != NetworkAccess.Internet)
            return;

        // connect to the app store api
        var connected = await CrossInAppBilling.Current.ConnectAsync();
        if (!connected)
            return;

        UserDialogs.Instance.HideHud();
        //try to make purchase, this will return a purchase, empty, or throw an exception
        var purchase = await CrossInAppBilling.Current.PurchaseAsync(productId, ItemType.Subscription);

        if (purchase == null)
        {
            //nothing was purchased
            return;
        }

        if (purchase.State == PurchaseState.Purchased)
        {
            Debug.WriteLine("Purchase successfull");
            Debug.WriteLine("Purchase token:>>" + purchase.PurchaseToken);
            Debug.WriteLine("Purchase id:>>" + purchase.Id);
        }
        else
        {
            throw new InAppBillingPurchaseException(PurchaseError.GeneralError);
        }
    }
    catch (InAppBillingPurchaseException purchaseEx)
    {
        // Handle all the different error codes that can occure and do a pop up
        Debug.WriteLine("purchaseEx:>>" + purchaseEx);
    }
    catch (Exception ex)
    {
        // Handle a generic exception as something really went wrong
        Debug.WriteLine("exception:>>" + ex);
    }
    finally
    {
        await CrossInAppBilling.Current.DisconnectAsync();
        IsBusy = false;
    }
}

The subscription purchasing process works fine, but now I want to verify the subscription status for a user after the purchase.

I tried using the Get All Subscription Statuses API from Apple, but I received an "Unauthorized" response when calling the API.

Which Apple developer APIs and Google developer APIs for validating and checking the user’s subscription status?

Can anyone provide a solution or guidance?

Thanks in advance for your help!

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