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mBraintreeFragment = BraintreeFragment.NewInstance(CrossCurrentActivity.Current.Activity, clientToken);

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PayPal.RequestOneTimePayment(mBraintreeFragment, new PayPalRequest($"{amount}"));

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PayPal.AuthorizeAccount(mBraintreeFragment);

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 <ListView  ItemsSource="{Binding RestaurantsGrouped}"
            GroupDisplayBinding="{Binding Key}"
            IsGroupingEnabled="True">
            ...       
 </ListView>

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_sourceCache.Connect()
.Filter(countryPredicate)
.Group(x => x.Category)
.Transform(g => new ObservableGroupedCollection<string, Restaurant, string>(g, filterPredicate, sortPredicate))
.Sort(SortExpressionComparer<ObservableGroupedCollection<string, Restaurant, string>>.Ascending(a => a.Key))
.Bind(out _restaurants)
.DisposeMany()
.Subscribe();

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public class ObservableGroupedCollection<TGroupKey, TObject, TKey> : ObservableCollectionExtended<TObject>, IDisposable
    {
        public TGroupKey Key { get; }

        public ObservableGroupedCollection(IGroup<TObject, TKey, TGroupKey> group, IObservable<Func<TObject, bool>> filter, IObservable<IComparer<TObject>> comparer)
        {
            this.Key = group.Key;

            //load and sort the grouped list
            var dataLoader = group.Cache.Connect()

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public ReadOnlyObservableCollection<ObservableGroupedCollection<string, Restaurant, string>> RestaurantsGrouped => _restaurants;

private readonly ReadOnlyObservableCollection<ObservableGroupedCollection<string, Restaurant, string>> _restaurants;

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_sourceCache.Connect()
.RefCount()
.Filter(countryPredicate)
.Filter(filterPredicate)
.Sort(sortPredicate)
.Bind(out _restaurants)
.DisposeMany()
.Subscribe();

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var sortPredicate = this.WhenAnyValue(x => x.SortBy)
                        .Select(x => x == "Type" ? SortExpressionComparer<Restaurant>.Ascending(a => a.Type) : SortExpressionComparer<Restaurant>.Ascending(a => a.Name));

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namespace DynamicDataGroupingSample
{
    public class MainViewModel : ReactiveObject, IDisposable
    {
        public MainViewModel()
        {
            SortCommand = ReactiveCommand.CreateFromTask(ExecuteSort);
        }
        private async Task ExecuteSort()
        {