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+# Using ABP Client Proxies in MAUI with OpenID Connect
+The purpose of this article is to integrate ABP Core into the MAUI project and initialize it as an **AbpModule** then make able consuming API using ABP IAppServices.
+
+Before we start, I offer my special thanks to [@hikalkan](https://github.com/hikalkan/maui-abp-playing) because this repository ( [hikalkan/maui-abp-playing](https://github.com/hikalkan/maui-abp-playing) ) is a fantastic inspiration for the purpose of this article.
+
+## Getting Started
+
+In this article, we'll work on an application that was built on the previous article: [Integrating MAUI Client via Using OpenID Connect](https://community.abp.io/posts/integrating-maui-client-via-using-openid-connect-aqjjwsdf).
+
+
+## Source Code
+Source code is available on GitHub: 
+[abpframework/abp-samples/MAUI-OpenId](https://github.com/abpframework/abp-samples/tree/master/MAUI-OpenId)
+
+
+## Configuring ABP Core
+
+As a first step, Dependency Injection will be changed with module initialization. We have to initialize our application as an ABP Module first.
+
+- Add the following dependencies to MAUI Client.
+
+    ```xml
+    <PackageReference Include="Volo.Abp.Http.Client.IdentityModel" Version="5.1.3" />
+    <PackageReference Include="Volo.Abp.Autofac" Version="5.1.3" />
+    ```
+
+- Add HttpApi.Client project reference
+
+    ```xml
+    <ProjectReference Include="..\..\aspnet-core\src\Acme.BookStore.HttpApi.Client\Acme.BookStore.HttpApi.Client.csproj" />
+    ```
+    And run `abp build` command under MAUI application folder.
+
+    > `abp build` command is equivalent of `dotnet build /graphBuild`, it's like a shortcut to graphBuild. The graphBuild finds all dependency tree and build them recursively.
+ 
+
+- Create **BookStoreMauiClientModule**.
+
+    ```csharp
+    using IdentityModel.OidcClient;
+    using Microsoft.Extensions.Configuration;
+    using Microsoft.Extensions.Options;
+    using Volo.Abp.Autofac;
+    using Volo.Abp.Http.Client.IdentityModel;
+    using Volo.Abp.Modularity;
+
+    namespace Acme.BookStore.MauiClient;
+
+    [DependsOn(
+        typeof(AbpAutofacModule),
+        typeof(AbpHttpClientIdentityModelModule),
+        typeof(BookStoreHttpApiClientModule)
+        )]
+    public class BookStoreMauiClientModule : AbpModule
+    {
+        public override void ConfigureServices(ServiceConfigurationContext context)
+        {
+            var configuration = context.Services.GetConfiguration();
+
+            Configure<OidcClientOptions>(configuration.GetSection("Oidc:Options"));
+
+            context.Services.AddTransient<OidcClient>(sp =>
+            {
+                var options = sp.GetRequiredService<IOptions<OidcClientOptions>>().Value;
+                options.Browser = sp.GetRequiredService<WebAuthenticatorBrowser>();
+                return new OidcClient(options);
+            });
+
+            context.Services.AddTransient<HttpClient>(sp =>
+                new HttpClient(sp.GetRequiredService<AccessTokenHttpMessageHandler>())
+                {
+                    // Temporarily. We'll use ABP's Proxy for sendind requests.
+                    BaseAddress = new Uri(configuration.GetValue<string>("RemoteServices:Default:BaseUrl"))
+                });
+        }
+    }
+    ```
+
+- Mark all dependencies with interfaces for registering as services.
+
+    ```csharp
+    internal class WebAuthenticatorBrowser : IBrowser, ITransientDependency
+    ```
+
+    ```csharp
+    public partial class MainPage : ContentPage, ITransientDependency
+    ```
+
+    ```csharp
+    public class AccessTokenHttpMessageHandler : DelegatingHandler, ISingletonDependency
+    ```
+
+- Add `appsettings.json` file to root path of your application and mark it as **Embedded resource**.
+
+    ```json
+    {
+        "Oidc": {
+            "Options": {
+                "Authority": "https://46fd-45-156-29-175.ngrok.io",
+                "ClientId": "BookStore_Maui",
+                "RedirectUri": "bookstore://",
+                "Scope": "openid email profile role BookStore offline_access",
+                "ClientSecret": "1q2w3E*"
+            }
+        },
+        "RemoteServices": {
+            "Default": {
+                "BaseUrl": "https://46fd-45-156-29-175.ngrok.io"
+            }
+        }
+    }
+    ```
+ 
+ - Finally, Go back `MauiApplication.cs` and clear old codes and initialize ABP.
+
+    ```csharp
+    using Microsoft.Extensions.Configuration;
+    using Microsoft.Extensions.FileProviders;
+    using System.Reflection;
+    using Volo.Abp;
+    using Volo.Abp.Autofac;
+
+    namespace Acme.BookStore.MauiClient;
+
+    public static class MauiProgram
+    {
+        public static MauiApp CreateMauiApp()
+        {
+            var builder = MauiApp.CreateBuilder();
+            builder.ConfigureContainer(new AbpAutofacServiceProviderFactory(new Autofac.ContainerBuilder()), containerBuilder =>
+            {
+
+            });
+            builder
+                .UseMauiApp<App>()
+                .ConfigureFonts(fonts =>
+                {
+                    fonts.AddFont("OpenSans-Regular.ttf", "OpenSansRegular");
+                });
+
+            ConfigureConfiguration(builder);
+
+            builder.Services.AddApplication<BookStoreMauiClientModule>(options =>
+            {
+                options.Services.ReplaceConfiguration(builder.Configuration);
+            });
+
+            var app = builder.Build();
+
+            app.Services.GetRequiredService<IAbpApplicationWithExternalServiceProvider>()
+                .Initialize(app.Services);
+
+            return app;
+        }
+
+        private static void ConfigureConfiguration(MauiAppBuilder builder)
+        {
+            var assembly = typeof(App).GetTypeInfo().Assembly;
+            builder.Configuration.AddJsonFile(new EmbeddedFileProvider(assembly), "appsettings.json", optional: false, false);
+        }
+    }
+    ```
+
+    Now application is runnable and all behaviors are the same with previos state. But it uses power of ABP right now.
+
+    ### Switching to SecureStorage
+    .Net MAUI supports a secure storage by default. Before we go further, we need to switch to secure storage instead of using app properties. Just update login method as below at **MainPage.xaml.cs**
+
+    ```csharp
+    private async void OnLoginClicked(object sender, EventArgs e)
+    {
+        var loginResult = await OidcClient.LoginAsync(new LoginRequest());
+        if (loginResult.IsError)
+        {
+            await DisplayAlert("Error", loginResult.Error, "Close");
+            return;
+        }
+
+        await SecureStorage.SetAsync(OidcConsts.AccessTokenKeyName, loginResult.AccessToken);
+        await SecureStorage.SetAsync(OidcConsts.RefreshTokenKeyName, loginResult.RefreshToken);
+    }
+    ```
+
+    > Additionally, please configure each platform according to [Secure Storage documentation](https://docs.microsoft.com/en-us/xamarin/essentials/secure-storage?tabs=android) 
+
+
+## Configuring Client Proxies
+
+ABP Client-Proxies don't use HttpClient directly. They use `IHttpClientFactory` to activate a new HttpClient instead of injecting it directly. So, we won't need **AccessTokenHttpMessageHandler** anymore. But still there is a way needed to set access token in requests. No worries, ABP has `IRemoteServiceHttpClientAuthenticator` to do that operation. Implementing it and registering to container will solve that issue and the client will be able to make authorized request to server.
+
+
+- Remove **AccessTokenHttpMessageHandler.cs** from the project.
+
+- Add **AccessTokenRemoteServiceHttpClientAuthenticator.cs** instead.
+
+    ```csharp
+    using IdentityModel.Client;
+    using IdentityModel.OidcClient;
+    using System.IdentityModel.Tokens.Jwt;
+    using Volo.Abp.DependencyInjection;
+    using Volo.Abp.Http.Client.Authentication;
+    using DependencyAttribute = Volo.Abp.DependencyInjection.DependencyAttribute;
+
+    namespace Acme.BookStore.MauiClient;
+
+    [Dependency(ReplaceServices = true)]
+    [ExposeServices(typeof(IRemoteServiceHttpClientAuthenticator))]
+    public class AccessTokenRemoteServiceHttpClientAuthenticator : IRemoteServiceHttpClientAuthenticator, ITransientDependency
+    {
+        protected OidcClient OidcClient { get; }
+
+        public AccessTokenRemoteServiceHttpClientAuthenticator(OidcClient oidcClient)
+        {
+            OidcClient = oidcClient;
+        }
+
+        public async Task Authenticate(RemoteServiceHttpClientAuthenticateContext context)
+        {
+            var currentAccessToken = await SecureStorage.GetAsync(OidcConsts.AccessTokenKeyName);
+
+            if (!currentAccessToken.IsNullOrEmpty())
+            {
+                // TODO: Find better way to find if token is expired instead of parsing it.
+                var jwtToken = new JwtSecurityTokenHandler().ReadJwtToken(currentAccessToken) as JwtSecurityToken;
+                if (jwtToken.ValidTo <= DateTime.UtcNow)
+                {
+                    var refreshToken = await SecureStorage.GetAsync(OidcConsts.RefreshTokenKeyName);
+                    if (!refreshToken.IsNullOrEmpty())
+                    {
+                        var refreshResult = await OidcClient.RefreshTokenAsync(refreshToken);
+
+                        await SecureStorage.SetAsync(OidcConsts.AccessTokenKeyName, refreshResult.AccessToken);
+                        await SecureStorage.SetAsync(OidcConsts.RefreshTokenKeyName, refreshResult.RefreshToken);
+
+                        context.Request.SetBearerToken(refreshResult.AccessToken);
+                    }
+                    else
+                    {
+                        var loginResult = await OidcClient.LoginAsync(new LoginRequest());
+
+                        await SecureStorage.SetAsync(OidcConsts.AccessTokenKeyName, loginResult.AccessToken);
+                        await SecureStorage.SetAsync(OidcConsts.RefreshTokenKeyName, loginResult.RefreshToken);
+
+                        context.Request.SetBearerToken(loginResult.AccessToken);
+                    }
+                }
+
+                context.Request.SetBearerToken(currentAccessToken);
+            }
+        }
+    }
+    ```
+
+- Now we are ready to inject IAppServices to communicate with backend.
+
+## Displaying Data in UI
+
+- Go back to **Acme.BookStore.Domain** project and add a simple data seed contributor to generate some example data for users.
+
+    ```csharp
+    public class UsersDataSeederContributor : IDataSeedContributor, ITransientDependency
+    {
+        protected IIdentityUserRepository repository;
+
+        protected IGuidGenerator guidGenerator;
+        public UsersDataSeederContributor(IIdentityUserRepository repository, IGuidGenerator guidGenerator)
+        {
+            this.repository = repository;
+            this.guidGenerator = guidGenerator;
+        }
+
+        public async Task SeedAsync(DataSeedContext context)
+        {
+            var count = await repository.GetCountAsync();
+            if(count <= 1) // Not sure 'admin' user was seeded before or not.
+            {
+                // All the names below were generated by https://www.name-generator.org.uk/quick/
+                // The names does not represent real people.
+                await repository.InsertManyAsync(new []{
+                    new IdentityUser(guidGenerator.Create(), "john.doe", "john.doe@abp.io"),
+                    new IdentityUser(guidGenerator.Create(), "Zane.Frost", "Zane.Frost@abp.io"),
+                    new IdentityUser(guidGenerator.Create(), "Oscar.Landry", "Oscar.Landry@abp.io"),
+                    new IdentityUser(guidGenerator.Create(), "Yasemin.Roberts", "Yasemin.Roberts@abp.io"),
+                    new IdentityUser(guidGenerator.Create(), "Yasmine.Perez", "Yasmine.Perez@abp.io"),
+                    new IdentityUser(guidGenerator.Create(), "Tobi.Becker", "Tobi.Becker@abp.io"),
+                    new IdentityUser(guidGenerator.Create(), "Fox.Gilmore", "Fox.Gilmore@abp.io"),
+                    new IdentityUser(guidGenerator.Create(), "Benny.Burris", "Benny.Burris@abp.io"),
+                    new IdentityUser(guidGenerator.Create(), "Chad.Camacho", "Chad.Camacho@abp.io"),
+                });
+            }
+        }
+    }
+    ```
+
+- Run the **Acme.BookStore.DbMigrator** project.
+
+- Turn back to MAUI app, and create a folder named **ViewModels** and add a simple `UsersViewModel.cs` under it.
+
+    ```csharp
+    public class UsersViewModel : BindableObject, ITransientDependency
+    {
+        protected IIdentityUserAppService IdentityUserAppService { get; }
+
+        public GetIdentityUsersInput Input { get; } = new();
+
+        public ObservableCollection<IdentityUserDto> Items { get; } = new();
+
+        public Command RefreshCommand { get; }
+
+        private bool isBusy;
+        public bool IsBusy { get => isBusy; set => SetProperty(ref isBusy, value); }
+
+        public UsersViewModel(IIdentityUserAppService identityUserAppService)
+        {
+            IdentityUserAppService = identityUserAppService;
+            GetUsersAsync();
+            RefreshCommand = new Command(GetUsersAsync);
+        }
+
+        protected async void GetUsersAsync()
+        {
+            if (IsBusy)
+            {
+                return; // For preventing parallel request while searching.
+            }
+
+            IsBusy = true;
+
+            Items.Clear();
+
+            var result = await IdentityUserAppService.GetListAsync(Input);
+            foreach (var user in result.Items)
+            {
+                Items.Add(user);
+            }
+
+            IsBusy = false;
+        }
+
+        protected void SetProperty<T>(ref T backField, T value, [CallerMemberName] string propertyName = null)
+        {
+            backField = value;
+            OnPropertyChanged(propertyName);
+        }
+    }
+    ```
+
+- Create a folder named **Pages** and add a content page named `UsersPage`.
+
+    _(Make sure you're adding MAUI Content Page)_
+
+    ![net-maui-abp-contentpage-template](art/net-maui-contentpage-template.png)
+
+- And inject `UsersViewModel` into it.
+
+    ```csharp
+    public partial class UsersPage : ContentPage, ITransientDependency
+    {
+        public UsersViewModel ViewModel { get; }
+
+        public UsersPage(UsersViewModel viewModel)
+        {
+            ViewModel = viewModel;
+            InitializeComponent();
+        }
+    }
+    ```
+
+- And use that ViewModel in XAML design page.
+
+    ```xml
+    <?xml version="1.0" encoding="utf-8" ?>
+    <ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
+                xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+                x:Class="Acme.BookStore.MauiClient.UsersPage"
+                Title="UsersPage"
+                x:Name="page"
+                BindingContext="{Binding ViewModel, Source={x:Reference page}}">
+        <StackLayout>
+            <ListView 
+                IsPullToRefreshEnabled="True"
+                ItemsSource="{Binding Items}"
+                IsRefreshing="{Binding IsBusy}"
+                RefreshCommand="{Binding RefreshCommand}">
+                <ListView.Header>
+                    <SearchBar Text="{Binding Input.Filter}" SearchCommand="{Binding RefreshCommand}" />
+                </ListView.Header>
+                <ListView.ItemTemplate>
+                    <DataTemplate>
+                        <TextCell 
+                            Text="{Binding UserName, StringFormat='@{0}'}"
+                            Detail="{Binding Email}"/>
+                    </DataTemplate>
+                </ListView.ItemTemplate>
+            </ListView>
+        </StackLayout>
+    </ContentPage>
+    ```
+
+    > I've used binding while setting **BindingContext** as **ViewModel** because of IntelliSense support. With this method, you'll see intellisense will suggest properties from your ViewModel.
+    >
+    > ![abp-maui-demo-xaml-intellisense](art/xaml-intellisense.png)
+
+
+After a couple of try, I realized, only AppShell supports dependency injection while navigating between pages. So, adding a new AppShell will help to build app menus and navigating with route. We can pass parameters with querystring with this way.
+
+- Add `Shell Pagae (MAUI)` to root of your application with name **AppShell.xaml**.
+
+    _I've got some help for design of shell page from microsoft's articles._
+
+    _Additionally, you might want to put [abp_icon.svg](maui/Acme.BookStore.MauiClient/Resources/Images/abp_logo.svg) file under your **Resources/Images** folder._
+    ```xml
+    <?xml version="1.0" encoding="utf-8" ?>
+    <Shell x:Class="Acme.BookStore.MauiClient.AppShell"
+        xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+        xmlns:local="clr-namespace:Acme.BookStore.MauiClient">
+        <Shell.Resources>
+            <ResourceDictionary>
+                <Color x:Key="Primary">#512BD4</Color>
+                <Style x:Key="BaseStyle" TargetType="Element">
+                    <Setter Property="Shell.BackgroundColor" Value="{StaticResource Primary}" />
+                    <Setter Property="Shell.ForegroundColor" Value="White" />
+                    <Setter Property="Shell.TitleColor" Value="White" />
+                    <Setter Property="Shell.DisabledColor" Value="#B4FFFFFF" />
+                    <Setter Property="Shell.UnselectedColor" Value="#95FFFFFF" />
+                    <Setter Property="Shell.TabBarBackgroundColor" Value="{StaticResource Primary}" />
+                    <Setter Property="Shell.TabBarForegroundColor" Value="White"/>
+                    <Setter Property="Shell.TabBarUnselectedColor" Value="#95FFFFFF"/>
+                    <Setter Property="Shell.TabBarTitleColor" Value="White"/>
+                </Style>
+                <Style TargetType="TabBar" BasedOn="{StaticResource BaseStyle}" />
+                <Style TargetType="FlyoutItem" BasedOn="{StaticResource BaseStyle}" />
+                <Style Class="FlyoutItemLabelStyle" TargetType="Label">
+                    <Setter Property="TextColor" Value="White"></Setter>
+                    <Setter Property="Margin" Value="16"></Setter>
+                </Style>
+                <Style Class="FlyoutItemLayoutStyle" TargetType="Layout" ApplyToDerivedTypes="True">
+                    <Setter Property="VisualStateManager.VisualStateGroups">
+                        <VisualStateGroupList>
+                            <VisualStateGroup x:Name="CommonStates">
+                                <VisualState x:Name="Normal">
+                                    <VisualState.Setters>
+                                        <Setter Property="BackgroundColor" Value="{x:OnPlatform UWP=Transparent, iOS=White, Android=White}" />
+                                        <Setter TargetName="FlyoutItemLabel" Property="Label.TextColor" Value="{StaticResource Primary}" />
+                                    </VisualState.Setters>
+                                </VisualState>
+                                <VisualState x:Name="Selected">
+                                    <VisualState.Setters>
+                                        <Setter Property="BackgroundColor" Value="{StaticResource Primary}" />
+                                    </VisualState.Setters>
+                                </VisualState>
+                            </VisualStateGroup>
+                        </VisualStateGroupList>
+                    </Setter>
+                </Style>
+
+                <Style Class="MenuItemLayoutStyle" TargetType="Layout" ApplyToDerivedTypes="True">
+                    <Setter Property="VisualStateManager.VisualStateGroups">
+                        <VisualStateGroupList>
+                            <VisualStateGroup x:Name="CommonStates">
+                                <VisualState x:Name="Normal">
+                                    <VisualState.Setters>
+                                        <Setter TargetName="FlyoutItemLabel" Property="Label.TextColor" Value="{StaticResource Primary}" />
+                                    </VisualState.Setters>
+                                </VisualState>
+                            </VisualStateGroup>
+                        </VisualStateGroupList>
+                    </Setter>
+                </Style>
+            </ResourceDictionary>
+        </Shell.Resources>
+        
+        <FlyoutItem Title="Home">
+            <ShellContent ContentTemplate="{DataTemplate local:MainPage}" Route="main" />
+        </FlyoutItem>
+
+        <FlyoutItem Title="Users">
+            <ShellContent ContentTemplate="{DataTemplate local:UsersPage}" Route="UsersPage" />
+        </FlyoutItem>
+
+        <Shell.FlyoutHeader>
+            <StackLayout>
+                <Image 
+                    Source="abp_logo.svg"
+                    HorizontalOptions="Center"
+                    Margin="25"/>
+            </StackLayout>
+        </Shell.FlyoutHeader>
+
+    </Shell>
+    ```
+
+- One more step is required. Go to **App.xaml.cs** and replace MainPage with AppShell.
+
+    ```csharp
+    public partial class App : Application
+    {
+        public App()
+        {
+            InitializeComponent();
+
+            MainPage = new AppShell();
+        }
+    }
+    ```
+
+- Run the application. 
+
+- Login once if you haven't done before.
+
+- Navigate to Users page with hamburger menu at the right top.
+
+| Android| iOS|
+| --- | --- |
+| ![abp-maui-android-appservice](art/android-users-demo.gif) | ![ios-abp-maui](art/ios-users-demo.gif) |
+
+| UWP |
+| --- | 
+| ![abp-maui-uwp-appservice](art/uwp-users-demo.gif) |
+
+| MacCatalyst |
+| --- |
+| ![abp-maui-MacCatalyst-appservice](art/macos-users-demo.gif) |
+
+
+## Conclusion
+ABP Framework can be implemented any platform that runs on dotnet without suffer. ABP provides reusable abstractions layers and HttpApi Clients. In this article we've used powerful ABP core features such as Dependency Injection, Client Proxies, Validation and more. 
+
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+# Using ABP Client Proxies in MAUI with OpenID Connect
+The purpose of this article is to integrate ABP Core into the MAUI project and initialize it as an **AbpModule** then make able consuming API using ABP IAppServices.
+
+Before we start, I offer my special thanks to [@hikalkan](https://github.com/hikalkan/maui-abp-playing) because this repository ( [hikalkan/maui-abp-playing](https://github.com/hikalkan/maui-abp-playing) ) is a fantastic inspiration for the purpose of this article.
+
+## Getting Started
+
+In this article, we'll work on an application that was built on the previous article: [Integrating MAUI Client via Using OpenID Connect](https://community.abp.io/posts/integrating-maui-client-via-using-openid-connect-aqjjwsdf).
+
+
+## Source Code
+Source code is available on GitHub: 
+[abpframework/abp-samples/MAUI-OpenId](https://github.com/abpframework/abp-samples/tree/master/MAUI-OpenId)
+
+
+## Configuring ABP Core
+
+As a first step, Dependency Injection will be changed with module initialization. We have to initialize our application as an ABP Module first.
+
+- Add the following dependencies to MAUI Client.
+
+    ```xml
+    <PackageReference Include="Volo.Abp.Http.Client.IdentityModel" Version="5.1.3" />
+    <PackageReference Include="Volo.Abp.Autofac" Version="5.1.3" />
+    ```
+
+- Add HttpApi.Client project reference
+
+    ```xml
+    <ProjectReference Include="..\..\aspnet-core\src\Acme.BookStore.HttpApi.Client\Acme.BookStore.HttpApi.Client.csproj" />
+    ```
+    And run `abp build` command under MAUI application folder.
+
+    > `abp build` command is equivalent of `dotnet build /graphBuild`, it's like a shortcut to graphBuild. The graphBuild finds all dependency tree and build them recursively.
+ 
+
+- Create **BookStoreMauiClientModule**.
+
+    ```csharp
+    using IdentityModel.OidcClient;
+    using Microsoft.Extensions.Configuration;
+    using Microsoft.Extensions.Options;
+    using Volo.Abp.Autofac;
+    using Volo.Abp.Http.Client.IdentityModel;
+    using Volo.Abp.Modularity;
+
+    namespace Acme.BookStore.MauiClient;
+
+    [DependsOn(
+        typeof(AbpAutofacModule),
+        typeof(AbpHttpClientIdentityModelModule),
+        typeof(BookStoreHttpApiClientModule)
+        )]
+    public class BookStoreMauiClientModule : AbpModule
+    {
+        public override void ConfigureServices(ServiceConfigurationContext context)
+        {
+            var configuration = context.Services.GetConfiguration();
+
+            Configure<OidcClientOptions>(configuration.GetSection("Oidc:Options"));
+
+            context.Services.AddTransient<OidcClient>(sp =>
+            {
+                var options = sp.GetRequiredService<IOptions<OidcClientOptions>>().Value;
+                options.Browser = sp.GetRequiredService<WebAuthenticatorBrowser>();
+                return new OidcClient(options);
+            });
+
+            context.Services.AddTransient<HttpClient>(sp =>
+                new HttpClient(sp.GetRequiredService<AccessTokenHttpMessageHandler>())
+                {
+                    // Temporarily. We'll use ABP's Proxy for sendind requests.
+                    BaseAddress = new Uri(configuration.GetValue<string>("RemoteServices:Default:BaseUrl"))
+                });
+        }
+    }
+    ```
+
+- Mark all dependencies with interfaces for registering as services.
+
+    ```csharp
+    internal class WebAuthenticatorBrowser : IBrowser, ITransientDependency
+    ```
+
+    ```csharp
+    public partial class MainPage : ContentPage, ITransientDependency
+    ```
+
+    ```csharp
+    public class AccessTokenHttpMessageHandler : DelegatingHandler, ISingletonDependency
+    ```
+
+- Add `appsettings.json` file to root path of your application and mark it as **Embedded resource**.
+
+    ```json
+    {
+        "Oidc": {
+            "Options": {
+                "Authority": "https://46fd-45-156-29-175.ngrok.io",
+                "ClientId": "BookStore_Maui",
+                "RedirectUri": "bookstore://",
+                "Scope": "openid email profile role BookStore offline_access",
+                "ClientSecret": "1q2w3E*"
+            }
+        },
+        "RemoteServices": {
+            "Default": {
+                "BaseUrl": "https://46fd-45-156-29-175.ngrok.io"
+            }
+        }
+    }
+    ```
+ 
+ - Finally, Go back `MauiApplication.cs` and clear old codes and initialize ABP.
+
+    ```csharp
+    using Microsoft.Extensions.Configuration;
+    using Microsoft.Extensions.FileProviders;
+    using System.Reflection;
+    using Volo.Abp;
+    using Volo.Abp.Autofac;
+
+    namespace Acme.BookStore.MauiClient;
+
+    public static class MauiProgram
+    {
+        public static MauiApp CreateMauiApp()
+        {
+            var builder = MauiApp.CreateBuilder();
+            builder.ConfigureContainer(new AbpAutofacServiceProviderFactory(new Autofac.ContainerBuilder()), containerBuilder =>
+            {
+
+            });
+            builder
+                .UseMauiApp<App>()
+                .ConfigureFonts(fonts =>
+                {
+                    fonts.AddFont("OpenSans-Regular.ttf", "OpenSansRegular");
+                });
+
+            ConfigureConfiguration(builder);
+
+            builder.Services.AddApplication<BookStoreMauiClientModule>(options =>
+            {
+                options.Services.ReplaceConfiguration(builder.Configuration);
+            });
+
+            var app = builder.Build();
+
+            app.Services.GetRequiredService<IAbpApplicationWithExternalServiceProvider>()
+                .Initialize(app.Services);
+
+            return app;
+        }
+
+        private static void ConfigureConfiguration(MauiAppBuilder builder)
+        {
+            var assembly = typeof(App).GetTypeInfo().Assembly;
+            builder.Configuration.AddJsonFile(new EmbeddedFileProvider(assembly), "appsettings.json", optional: false, false);
+        }
+    }
+    ```
+
+    Now application is runnable and all behaviors are the same with previos state. But it uses power of ABP right now.
+
+    ### Switching to SecureStorage
+    .Net MAUI supports a secure storage by default. Before we go further, we need to switch to secure storage instead of using app properties. Just update login method as below at **MainPage.xaml.cs**
+
+    ```csharp
+    private async void OnLoginClicked(object sender, EventArgs e)
+    {
+        var loginResult = await OidcClient.LoginAsync(new LoginRequest());
+        if (loginResult.IsError)
+        {
+            await DisplayAlert("Error", loginResult.Error, "Close");
+            return;
+        }
+
+        await SecureStorage.SetAsync(OidcConsts.AccessTokenKeyName, loginResult.AccessToken);
+        await SecureStorage.SetAsync(OidcConsts.RefreshTokenKeyName, loginResult.RefreshToken);
+    }
+    ```
+
+    > Additionally, please configure each platform according to [Secure Storage documentation](https://docs.microsoft.com/en-us/xamarin/essentials/secure-storage?tabs=android) 
+
+
+## Configuring Client Proxies
+
+ABP Client-Proxies don't use HttpClient directly. They use `IHttpClientFactory` to activate a new HttpClient instead of injecting it directly. So, we won't need **AccessTokenHttpMessageHandler** anymore. But still there is a way needed to set access token in requests. No worries, ABP has `IRemoteServiceHttpClientAuthenticator` to do that operation. Implementing it and registering to container will solve that issue and the client will be able to make authorized request to server.
+
+
+- Remove **AccessTokenHttpMessageHandler.cs** from the project.
+
+- Add **AccessTokenRemoteServiceHttpClientAuthenticator.cs** instead.
+
+    ```csharp
+    using IdentityModel.Client;
+    using IdentityModel.OidcClient;
+    using System.IdentityModel.Tokens.Jwt;
+    using Volo.Abp.DependencyInjection;
+    using Volo.Abp.Http.Client.Authentication;
+    using DependencyAttribute = Volo.Abp.DependencyInjection.DependencyAttribute;
+
+    namespace Acme.BookStore.MauiClient;
+
+    [Dependency(ReplaceServices = true)]
+    [ExposeServices(typeof(IRemoteServiceHttpClientAuthenticator))]
+    public class AccessTokenRemoteServiceHttpClientAuthenticator : IRemoteServiceHttpClientAuthenticator, ITransientDependency
+    {
+        protected OidcClient OidcClient { get; }
+
+        public AccessTokenRemoteServiceHttpClientAuthenticator(OidcClient oidcClient)
+        {
+            OidcClient = oidcClient;
+        }
+
+        public async Task Authenticate(RemoteServiceHttpClientAuthenticateContext context)
+        {
+            var currentAccessToken = await SecureStorage.GetAsync(OidcConsts.AccessTokenKeyName);
+
+            if (!currentAccessToken.IsNullOrEmpty())
+            {
+                // TODO: Find better way to find if token is expired instead of parsing it.
+                var jwtToken = new JwtSecurityTokenHandler().ReadJwtToken(currentAccessToken) as JwtSecurityToken;
+                if (jwtToken.ValidTo <= DateTime.UtcNow)
+                {
+                    var refreshToken = await SecureStorage.GetAsync(OidcConsts.RefreshTokenKeyName);
+                    if (!refreshToken.IsNullOrEmpty())
+                    {
+                        var refreshResult = await OidcClient.RefreshTokenAsync(refreshToken);
+
+                        await SecureStorage.SetAsync(OidcConsts.AccessTokenKeyName, refreshResult.AccessToken);
+                        await SecureStorage.SetAsync(OidcConsts.RefreshTokenKeyName, refreshResult.RefreshToken);
+
+                        context.Request.SetBearerToken(refreshResult.AccessToken);
+                    }
+                    else
+                    {
+                        var loginResult = await OidcClient.LoginAsync(new LoginRequest());
+
+                        await SecureStorage.SetAsync(OidcConsts.AccessTokenKeyName, loginResult.AccessToken);
+                        await SecureStorage.SetAsync(OidcConsts.RefreshTokenKeyName, loginResult.RefreshToken);
+
+                        context.Request.SetBearerToken(loginResult.AccessToken);
+                    }
+                }
+
+                context.Request.SetBearerToken(currentAccessToken);
+            }
+        }
+    }
+    ```
+
+- Now we are ready to inject IAppServices to communicate with backend.
+
+## Displaying Data in UI
+
+- Go back to **Acme.BookStore.Domain** project and add a simple data seed contributor to generate some example data for users.
+
+    ```csharp
+    public class UsersDataSeederContributor : IDataSeedContributor, ITransientDependency
+    {
+        protected IIdentityUserRepository repository;
+
+        protected IGuidGenerator guidGenerator;
+        public UsersDataSeederContributor(IIdentityUserRepository repository, IGuidGenerator guidGenerator)
+        {
+            this.repository = repository;
+            this.guidGenerator = guidGenerator;
+        }
+
+        public async Task SeedAsync(DataSeedContext context)
+        {
+            var count = await repository.GetCountAsync();
+            if(count <= 1) // Not sure 'admin' user was seeded before or not.
+            {
+                // All the names below were generated by https://www.name-generator.org.uk/quick/
+                // The names does not represent real people.
+                await repository.InsertManyAsync(new []{
+                    new IdentityUser(guidGenerator.Create(), "john.doe", "john.doe@abp.io"),
+                    new IdentityUser(guidGenerator.Create(), "Zane.Frost", "Zane.Frost@abp.io"),
+                    new IdentityUser(guidGenerator.Create(), "Oscar.Landry", "Oscar.Landry@abp.io"),
+                    new IdentityUser(guidGenerator.Create(), "Yasemin.Roberts", "Yasemin.Roberts@abp.io"),
+                    new IdentityUser(guidGenerator.Create(), "Yasmine.Perez", "Yasmine.Perez@abp.io"),
+                    new IdentityUser(guidGenerator.Create(), "Tobi.Becker", "Tobi.Becker@abp.io"),
+                    new IdentityUser(guidGenerator.Create(), "Fox.Gilmore", "Fox.Gilmore@abp.io"),
+                    new IdentityUser(guidGenerator.Create(), "Benny.Burris", "Benny.Burris@abp.io"),
+                    new IdentityUser(guidGenerator.Create(), "Chad.Camacho", "Chad.Camacho@abp.io"),
+                });
+            }
+        }
+    }
+    ```
+
+- Run the **Acme.BookStore.DbMigrator** project.
+
+- Turn back to MAUI app, and create a folder named **ViewModels** and add a simple `UsersViewModel.cs` under it.
+
+    ```csharp
+    public class UsersViewModel : BindableObject, ITransientDependency
+    {
+        protected IIdentityUserAppService IdentityUserAppService { get; }
+
+        public GetIdentityUsersInput Input { get; } = new();
+
+        public ObservableCollection<IdentityUserDto> Items { get; } = new();
+
+        public Command RefreshCommand { get; }
+
+        private bool isBusy;
+        public bool IsBusy { get => isBusy; set => SetProperty(ref isBusy, value); }
+
+        public UsersViewModel(IIdentityUserAppService identityUserAppService)
+        {
+            IdentityUserAppService = identityUserAppService;
+            GetUsersAsync();
+            RefreshCommand = new Command(GetUsersAsync);
+        }
+
+        protected async void GetUsersAsync()
+        {
+            if (IsBusy)
+            {
+                return; // For preventing parallel request while searching.
+            }
+
+            IsBusy = true;
+
+            Items.Clear();
+
+            var result = await IdentityUserAppService.GetListAsync(Input);
+            foreach (var user in result.Items)
+            {
+                Items.Add(user);
+            }
+
+            IsBusy = false;
+        }
+
+        protected void SetProperty<T>(ref T backField, T value, [CallerMemberName] string propertyName = null)
+        {
+            backField = value;
+            OnPropertyChanged(propertyName);
+        }
+    }
+    ```
+
+- Create a folder named **Pages** and add a content page named `UsersPage`.
+
+    _(Make sure you're adding MAUI Content Page)_
+
+    ![net-maui-abp-contentpage-template](art/net-maui-contentpage-template.png)
+
+- And inject `UsersViewModel` into it.
+
+    ```csharp
+    public partial class UsersPage : ContentPage, ITransientDependency
+    {
+        public UsersViewModel ViewModel { get; }
+
+        public UsersPage(UsersViewModel viewModel)
+        {
+            ViewModel = viewModel;
+            InitializeComponent();
+        }
+    }
+    ```
+
+- And use that ViewModel in XAML design page.
+
+    ```xml
+    <?xml version="1.0" encoding="utf-8" ?>
+    <ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
+                xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+                x:Class="Acme.BookStore.MauiClient.UsersPage"
+                Title="UsersPage"
+                x:Name="page"
+                BindingContext="{Binding ViewModel, Source={x:Reference page}}">
+        <StackLayout>
+            <ListView 
+                IsPullToRefreshEnabled="True"
+                ItemsSource="{Binding Items}"
+                IsRefreshing="{Binding IsBusy}"
+                RefreshCommand="{Binding RefreshCommand}">
+                <ListView.Header>
+                    <SearchBar Text="{Binding Input.Filter}" SearchCommand="{Binding RefreshCommand}" />
+                </ListView.Header>
+                <ListView.ItemTemplate>
+                    <DataTemplate>
+                        <TextCell 
+                            Text="{Binding UserName, StringFormat='@{0}'}"
+                            Detail="{Binding Email}"/>
+                    </DataTemplate>
+                </ListView.ItemTemplate>
+            </ListView>
+        </StackLayout>
+    </ContentPage>
+    ```
+
+    > I've used binding while setting **BindingContext** as **ViewModel** because of IntelliSense support. With this method, you'll see intellisense will suggest properties from your ViewModel.
+    >
+    > ![abp-maui-demo-xaml-intellisense](art/xaml-intellisense.png)
+
+
+After a couple of try, I realized, only AppShell supports dependency injection while navigating between pages. So, adding a new AppShell will help to build app menus and navigating with route. We can pass parameters with querystring with this way.
+
+- Add `Shell Pagae (MAUI)` to root of your application with name **AppShell.xaml**.
+
+    _I've got some help for design of shell page from microsoft's articles._
+
+    _Additionally, you might want to put [abp_icon.svg](maui/Acme.BookStore.MauiClient/Resources/Images/abp_logo.svg) file under your **Resources/Images** folder._
+    ```xml
+    <?xml version="1.0" encoding="utf-8" ?>
+    <Shell x:Class="Acme.BookStore.MauiClient.AppShell"
+        xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+        xmlns:local="clr-namespace:Acme.BookStore.MauiClient">
+        <Shell.Resources>
+            <ResourceDictionary>
+                <Color x:Key="Primary">#512BD4</Color>
+                <Style x:Key="BaseStyle" TargetType="Element">
+                    <Setter Property="Shell.BackgroundColor" Value="{StaticResource Primary}" />
+                    <Setter Property="Shell.ForegroundColor" Value="White" />
+                    <Setter Property="Shell.TitleColor" Value="White" />
+                    <Setter Property="Shell.DisabledColor" Value="#B4FFFFFF" />
+                    <Setter Property="Shell.UnselectedColor" Value="#95FFFFFF" />
+                    <Setter Property="Shell.TabBarBackgroundColor" Value="{StaticResource Primary}" />
+                    <Setter Property="Shell.TabBarForegroundColor" Value="White"/>
+                    <Setter Property="Shell.TabBarUnselectedColor" Value="#95FFFFFF"/>
+                    <Setter Property="Shell.TabBarTitleColor" Value="White"/>
+                </Style>
+                <Style TargetType="TabBar" BasedOn="{StaticResource BaseStyle}" />
+                <Style TargetType="FlyoutItem" BasedOn="{StaticResource BaseStyle}" />
+                <Style Class="FlyoutItemLabelStyle" TargetType="Label">
+                    <Setter Property="TextColor" Value="White"></Setter>
+                    <Setter Property="Margin" Value="16"></Setter>
+                </Style>
+                <Style Class="FlyoutItemLayoutStyle" TargetType="Layout" ApplyToDerivedTypes="True">
+                    <Setter Property="VisualStateManager.VisualStateGroups">
+                        <VisualStateGroupList>
+                            <VisualStateGroup x:Name="CommonStates">
+                                <VisualState x:Name="Normal">
+                                    <VisualState.Setters>
+                                        <Setter Property="BackgroundColor" Value="{x:OnPlatform UWP=Transparent, iOS=White, Android=White}" />
+                                        <Setter TargetName="FlyoutItemLabel" Property="Label.TextColor" Value="{StaticResource Primary}" />
+                                    </VisualState.Setters>
+                                </VisualState>
+                                <VisualState x:Name="Selected">
+                                    <VisualState.Setters>
+                                        <Setter Property="BackgroundColor" Value="{StaticResource Primary}" />
+                                    </VisualState.Setters>
+                                </VisualState>
+                            </VisualStateGroup>
+                        </VisualStateGroupList>
+                    </Setter>
+                </Style>
+
+                <Style Class="MenuItemLayoutStyle" TargetType="Layout" ApplyToDerivedTypes="True">
+                    <Setter Property="VisualStateManager.VisualStateGroups">
+                        <VisualStateGroupList>
+                            <VisualStateGroup x:Name="CommonStates">
+                                <VisualState x:Name="Normal">
+                                    <VisualState.Setters>
+                                        <Setter TargetName="FlyoutItemLabel" Property="Label.TextColor" Value="{StaticResource Primary}" />
+                                    </VisualState.Setters>
+                                </VisualState>
+                            </VisualStateGroup>
+                        </VisualStateGroupList>
+                    </Setter>
+                </Style>
+            </ResourceDictionary>
+        </Shell.Resources>
+        
+        <FlyoutItem Title="Home">
+            <ShellContent ContentTemplate="{DataTemplate local:MainPage}" Route="main" />
+        </FlyoutItem>
+
+        <FlyoutItem Title="Users">
+            <ShellContent ContentTemplate="{DataTemplate local:UsersPage}" Route="UsersPage" />
+        </FlyoutItem>
+
+        <Shell.FlyoutHeader>
+            <StackLayout>
+                <Image 
+                    Source="abp_logo.svg"
+                    HorizontalOptions="Center"
+                    Margin="25"/>
+            </StackLayout>
+        </Shell.FlyoutHeader>
+
+    </Shell>
+    ```
+
+- One more step is required. Go to **App.xaml.cs** and replace MainPage with AppShell.
+
+    ```csharp
+    public partial class App : Application
+    {
+        public App()
+        {
+            InitializeComponent();
+
+            MainPage = new AppShell();
+        }
+    }
+    ```
+
+- Run the application. 
+
+- Login once if you haven't done before.
+
+- Navigate to Users page with hamburger menu at the right top.
+
+| Android| iOS|
+| --- | --- |
+| ![abp-maui-android-appservice](art/android-users-demo.gif) | ![ios-abp-maui](art/ios-users-demo.gif) |
+
+| UWP |
+| --- | 
+| ![abp-maui-uwp-appservice](art/uwp-users-demo.gif) |
+
+| MacCatalyst |
+| --- |
+| ![abp-maui-MacCatalyst-appservice](art/macos-users-demo.gif) |
+
+
+## Conclusion
+ABP Framework can be implemented any platform that runs on dotnet without suffer. ABP provides reusable abstractions layers and HttpApi Clients. In this article we've used powerful ABP core features such as Dependency Injection, Client Proxies, Validation and more. 
+