CheckIapAvailability update

IapManager.cs

public void CheckIapAvailability()
{
    iapClient = Iap.GetIapClient();
    ITask<EnvReadyResult> task = iapClient.EnvReady;
    task.AddOnSuccessListener((result) =>
    {
        Debug.Log($"{TAG}: checkIapAvailabity SUCCESS");
        iapAvailable = true;
        OnCheckIapAvailabilitySuccess?.Invoke();
    }).AddOnFailureListener(exception =>
    {
        Debug.Log($"{TAG}: Error on checkIapAvailabity");
        IapApiException iapApiException = exception.AsIapApiException();
        Status status = iapApiException.Status;

        if (status.HasResolution())
        {
            status.StartResolutionForResult(
                intent => {
                    iapAvailable = true;
                    Debug.Log($"{TAG}: checkIapAvailabity SUCCESS");
                    OnCheckIapAvailabilitySuccess?.Invoke();
                },
                ex =>
                {
                    Debug.Log($"{TAG}: Error on checkIapAvailabity2");
                    iapClient = null;
                    iapAvailable = false;
                    OnCheckIapAvailabilityFailure?.Invoke(exception);
                });
        } else
        {
            Debug.Log($"{TAG}: Error on checkIapAvailabity3");
            iapClient = null;
            iapAvailable = false;
            OnCheckIapAvailabilityFailure?.Invoke(exception);
        }
    });
}