BTCPay Extensions Part 2 (#2001)

* BTCPay Extensions Part 2

This PR cleans up the extension system a bit in that:
 * It renames the test extension to a more uniform name
 * Allows yo uto have system extensions, which are extensions but bundled by default with the release (and cannot be removed)
 * Adds a tool to help you generate an extension package from a csproj
 * Refactors the UI extension points to a view component
 * Moves some more interfaces to the Abstractions csproj

* Rename to plugins

.gitignore

@@ -298,3 +298,4 @@ BTCPayServer/wwwroot/bundles/*
 !.vscode/extensions.json
 BTCPayServer/testpwd
 .DS_Store
+Packed Plugins

.run/Build and pack extensions.run.xml

@@ -0,0 +1,6 @@
+<component name="ProjectRunConfigurationManager">
+  <configuration default="false" name="Build and pack plugins" type="CompoundRunConfigurationType">
+    <toRun name="Pack Test Plugin" type="DotNetProject" />
+    <method v="2" />
+  </configuration>
+</component>

.run/Pack Test Extension.run.xml

@@ -0,0 +1,21 @@
+<component name="ProjectRunConfigurationManager">
+  <configuration default="false" name="Pack Test Plugin" type="DotNetProject" factoryName=".NET Project" singleton="false">
+    <option name="EXE_PATH" value="$PROJECT_DIR$/BTCPayServer.PluginPacker/bin/Debug/netcoreapp3.1/BTCPayServer.PluginPacker.dll" />
+    <option name="PROGRAM_PARAMETERS" value="../../../../BTCPayServer.Plugins.Test\bin\Debug\netcoreapp3.1 BTCPayServer.Plugins.Test &quot;../../../../Packed Plugins&quot;" />
+    <option name="WORKING_DIRECTORY" value="$PROJECT_DIR$/BTCPayServer.PluginPacker/bin/Debug/netcoreapp3.1" />
+    <option name="PASS_PARENT_ENVS" value="1" />
+    <option name="USE_EXTERNAL_CONSOLE" value="0" />
+    <option name="USE_MONO" value="0" />
+    <option name="RUNTIME_ARGUMENTS" value="" />
+    <option name="PROJECT_PATH" value="$PROJECT_DIR$/BTCPayServer.PluginPacker/BTCPayServer.PluginPacker.csproj" />
+    <option name="PROJECT_EXE_PATH_TRACKING" value="1" />
+    <option name="PROJECT_ARGUMENTS_TRACKING" value="1" />
+    <option name="PROJECT_WORKING_DIRECTORY_TRACKING" value="1" />
+    <option name="PROJECT_KIND" value="DotNetCore" />
+    <option name="PROJECT_TFM" value=".NETCoreApp,Version=v3.1" />
+    <method v="2">
+      <option name="Build" default="false" projectName="BTCPayServer.Plugins.Test" projectPath="C:\Git\btcpayserver\BTCPayServer.Plugins.Test\BTCPayServer.Plugins.Test.csproj" />
+      <option name="Build" />
+    </method>
+  </configuration>
+</component>

BTCPayServer.Abstractions/Contracts/IBTCPayServerPlugin.cs

@@ -1,16 +1,20 @@
 using System;
+using System.Text.Json.Serialization;
+using BTCPayServer.Abstractions.Converters;
 using Microsoft.AspNetCore.Builder;
 using Microsoft.Extensions.DependencyInjection;
 
 namespace BTCPayServer.Contracts
 {
-    public interface IBTCPayServerExtension
+    public interface IBTCPayServerPlugin
     {
-        public string Identifier { get;}
+        public string Identifier { get; }
         string Name { get; }
+        [JsonConverter(typeof(VersionConverter))]
         Version Version { get; }
         string Description { get; }
-
+        bool SystemPlugin { get; set; }
+        string[] Dependencies { get; }
         void Execute(IApplicationBuilder applicationBuilder, IServiceProvider applicationBuilderApplicationServices);
         void Execute(IServiceCollection applicationBuilder);
     }

BTCPayServer.Abstractions/Contracts/ISettingsRepository.cs

@@ -0,0 +1,12 @@
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace BTCPayServer.Services
+{
+    public interface ISettingsRepository
+    {
+        Task<T> GetSettingAsync<T>(string name = null);
+        Task UpdateSetting<T>(T obj, string name = null);
+        Task<T> WaitSettingsChanged<T>(CancellationToken cancellationToken = default);
+    }
+}

BTCPayServer.Abstractions/Contracts/IStoreNavExtension.cs

@@ -1,15 +1,15 @@
 namespace BTCPayServer.Contracts
 {
-    public interface INavExtension
+    public interface IUIExtension
     {
         string Partial { get; }
         
         string Location { get; }
     }
 
-    public class NavExtension: INavExtension
+    public class UIExtension: IUIExtension
     {
-        public NavExtension(string partial, string location)
+        public UIExtension(string partial, string location)
         {
             Partial = partial;
             Location = location;

BTCPayServer.Abstractions/Converters/VersionConverter.cs

@@ -0,0 +1,19 @@
+using System;
+using System.Text.Json;
+using System.Text.Json.Serialization;
+
+namespace BTCPayServer.Abstractions.Converters
+{
+    public class VersionConverter : JsonConverter<Version>
+    {
+        public override Version Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
+        {
+            return Version.Parse(reader.GetString());
+        }
+
+        public override void Write(Utf8JsonWriter writer, Version value, JsonSerializerOptions options)
+        {
+            writer.WriteStringValue(value.ToString());
+        }
+    }
+}

BTCPayServer.Abstractions/Extensions/Extensions.cs

@@ -0,0 +1,20 @@
+using System.Text.Json;
+using BTCPayServer.Models;
+using Microsoft.AspNetCore.Mvc.ViewFeatures;
+
+namespace BTCPayServer
+{
+    public static class SetStatusMessageModelExtensions
+    {
+        public static void SetStatusMessageModel(this ITempDataDictionary tempData, StatusMessageModel statusMessage)
+        {
+            if (statusMessage == null)
+            {
+                tempData.Remove("StatusMessageModel");
+                return;
+            }
+
+            tempData["StatusMessageModel"] = JsonSerializer.Serialize(statusMessage, new JsonSerializerOptions());
+        }
+    }
+}

BTCPayServer.Abstractions/Models/BaseIbtcPayServerPlugin.cs

@@ -0,0 +1,36 @@
+using System;
+using System.Reflection;
+using BTCPayServer.Contracts;
+using Microsoft.AspNetCore.Builder;
+using Microsoft.Extensions.DependencyInjection;
+
+namespace BTCPayServer.Models
+{
+    public abstract class BaseBTCPayServerPlugin : IBTCPayServerPlugin
+    {
+        public abstract string Identifier { get; }
+        public abstract string Name { get; }
+
+        public virtual Version Version
+        {
+            get
+            {
+                return Assembly.GetAssembly(GetType())?.GetName().Version ?? new Version(1, 0, 0, 0);
+            }
+        }
+
+        public abstract string Description { get; }
+        public bool SystemPlugin { get; set; }
+        public bool SystemExtension { get; set; }
+        public virtual string[] Dependencies { get; } = Array.Empty<string>();
+
+        public virtual void Execute(IApplicationBuilder applicationBuilder,
+            IServiceProvider applicationBuilderApplicationServices)
+        {
+        }
+
+        public virtual void Execute(IServiceCollection applicationBuilder)
+        {
+        }
+    }
+}

BTCPayServer.Common/BTCPayNetwork.cs

@@ -24,7 +24,7 @@ namespace BTCPayServer
                 var settings = new BTCPayDefaultSettings();
                 _Settings.Add(chainType, settings);
                 settings.DefaultDataDirectory = StandardConfiguration.DefaultDataDirectory.GetDirectory("BTCPayServer", NBXplorerDefaultSettings.GetFolderName(chainType));
-                settings.DefaultExtensionDirectory =
+                settings.DefaultPluginDirectory =
                     StandardConfiguration.DefaultDataDirectory.GetDirectory("BTCPayServer", "Extensions");
                 settings.DefaultConfigurationFile = Path.Combine(settings.DefaultDataDirectory, "settings.config");
                 settings.DefaultPort = (chainType == NetworkType.Mainnet ? 23000 :
@@ -41,7 +41,7 @@ namespace BTCPayServer
         }
 
         public string DefaultDataDirectory { get; set; }
-        public string DefaultExtensionDirectory { get; set; }
+        public string DefaultPluginDirectory { get; set; }
         public string DefaultConfigurationFile { get; set; }
         public int DefaultPort { get; set; }
     }

BTCPayServer.PluginPacker/BTCPayServer.PluginPacker.csproj

@@ -0,0 +1,13 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <OutputType>Exe</OutputType>
+        <TargetFramework>netcoreapp3.1</TargetFramework>
+        <AssemblyVersion>1.0.0.1</AssemblyVersion>
+    </PropertyGroup>
+
+    <ItemGroup>
+      <ProjectReference Include="..\BTCPayServer.Abstractions\BTCPayServer.Abstractions.csproj" />
+    </ItemGroup>
+
+</Project>

BTCPayServer.PluginPacker/Program.cs

@@ -0,0 +1,50 @@
+using System;
+using System.IO;
+using System.IO.Compression;
+using System.Linq;
+using System.Reflection;
+using System.Text.Json;
+using BTCPayServer.Contracts;
+
+namespace BTCPayServer.PluginPacker
+{
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            var directory = args[0];
+            var name = args[1];
+            var outputDir = args[2];
+            var outputFile = Path.Combine(outputDir, name);
+            var rootDLLPath = Path.Combine(directory, name +".dll");
+            if (!File.Exists(rootDLLPath) )
+            {
+                throw new Exception($"{rootDLLPath} could not be found");
+            }
+
+            var assembly = Assembly.LoadFrom(rootDLLPath);
+            var extension = GetAllExtensionTypesFromAssembly(assembly).FirstOrDefault();
+            if (extension is null)
+            {
+                throw new Exception($"{rootDLLPath} is not a valid plugin");
+            }
+
+            var loadedPlugin = (IBTCPayServerPlugin)Activator.CreateInstance(extension);
+            var json = JsonSerializer.Serialize(loadedPlugin);
+            Directory.CreateDirectory(outputDir);
+            if (File.Exists(outputFile + ".btcpay"))
+            {
+                File.Delete(outputFile + ".btcpay");
+            }
+            ZipFile.CreateFromDirectory(directory, outputFile + ".btcpay", CompressionLevel.Optimal, false);
+            File.WriteAllText(outputFile + ".btcpay.json", json);
+        }
+        
+        private static Type[] GetAllExtensionTypesFromAssembly(Assembly assembly)
+        {
+            return assembly.GetTypes().Where(type =>
+                typeof(IBTCPayServerPlugin).IsAssignableFrom(type) &&
+                !type.IsAbstract).ToArray();
+        }
+    }
+}

BTCPayServer.PluginPacker/README.md

@@ -0,0 +1,4 @@
+This tool makes it easy to create a BTCPay plugin package. To create a package you must:
+* Build your BTCPay Plugin project
+* open a terminal in this project
+* run `dotnet run PATH_TO_PLUGIN_BUILD_DIRECTORY NAME_OF_PLUGIN BUILT_PACKAGE_OUTPUT_DIRECTORY`

BTCPayServer.Plugins.Test/ApplicationPartsLogger.cs

@@ -6,7 +6,7 @@ using Microsoft.AspNetCore.Mvc.Controllers;
 using Microsoft.Extensions.Hosting;
 using Microsoft.Extensions.Logging;
 
-namespace BTCPayServer.Test
+namespace BTCPayServer.Plugins.Test
 {
     public class ApplicationPartsLogger : IHostedService
     {

BTCPayServer.Plugins.Test/BTCPayServer.Plugins.Test.csproj

@@ -4,6 +4,7 @@
     <AddRazorSupportForMvc>true</AddRazorSupportForMvc>
     <PreserveCompilationContext>false</PreserveCompilationContext>
     <GenerateEmbeddedFilesManifest>true</GenerateEmbeddedFilesManifest>
+    <AssemblyVersion>1.0.0</AssemblyVersion>
 
   </PropertyGroup>
     <ItemGroup>

BTCPayServer.Plugins.Test/TestExtension.cs

@@ -0,0 +1,19 @@
+using BTCPayServer.Contracts;
+using BTCPayServer.Models;
+using Microsoft.Extensions.DependencyInjection;
+
+namespace BTCPayServer.Plugins.Test
+{
+    public class TestPlugin: BaseBTCPayServerPlugin
+    {
+        public  override string Identifier { get; } = "BTCPayServer.Plugins.Test";
+        public  override string Name { get; } = "Test Plugin!";
+        public  override string Description { get; } = "This is a description of the loaded test extension!";
+
+        public override void Execute(IServiceCollection services)
+        {
+            services.AddSingleton<IUIExtension>(new UIExtension("TestExtensionNavExtension", "header-nav"));
+            services.AddHostedService<ApplicationPartsLogger>();
+        }
+    }
+}

BTCPayServer.Plugins.Test/TestExtensionController.cs

@@ -1,6 +1,6 @@
 using Microsoft.AspNetCore.Mvc;
 
-namespace BTCPayServer.Test
+namespace BTCPayServer.Plugins.Test
 {
     [Route("extensions/test")]
     public class TestExtensionController : Controller

BTCPayServer.Test/TestExtension.cs

@@ -1,25 +0,0 @@
-using System;
-using BTCPayServer.Contracts;
-using Microsoft.AspNetCore.Builder;
-using Microsoft.Extensions.DependencyInjection;
-
-namespace BTCPayServer.Test
-{
-    public class TestExtension: IBTCPayServerExtension
-    {
-        public string Identifier { get; } = "BTCPayServer.Test";
-        public string Name { get; } = "Test Plugin!";
-        public Version Version { get; } = new Version(1,0,0,0);
-        public string Description { get; } = "This is a description of the loaded test extension!";
-        public void Execute(IApplicationBuilder applicationBuilder, IServiceProvider applicationBuilderApplicationServices)
-        {
-            
-        }
-
-        public void Execute(IServiceCollection services)
-        {
-            services.AddSingleton<INavExtension>(new NavExtension("TestExtensionNavExtension", "header-nav"));
-            services.AddHostedService<ApplicationPartsLogger>();
-        }
-    }
-}

BTCPayServer/BTCPayExtensions/ExtensionManager.cs

@@ -1,160 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.Globalization;
-using System.IO;
-using System.IO.Compression;
-using System.Linq;
-using System.Reflection;
-using BTCPayServer.Configuration;
-using BTCPayServer.Contracts;
-using McMaster.NETCore.Plugins;
-using Microsoft.AspNetCore.Builder;
-using Microsoft.AspNetCore.Hosting;
-using Microsoft.Extensions.Configuration;
-using Microsoft.Extensions.DependencyInjection;
-using Microsoft.Extensions.FileProviders;
-using Microsoft.Extensions.Logging;
-
-namespace BTCPayServer
-{
-    public static class ExtensionManager
-    {
-        public  const string BTCPayExtensionSuffix =".btcpay";
-        private static readonly List<Assembly> _pluginAssemblies = new List<Assembly>();
-        private static ILogger _logger;
-
-        public static IMvcBuilder AddExtensions(this IMvcBuilder mvcBuilder, IServiceCollection serviceCollection,
-            IConfiguration config, ILoggerFactory loggerFactory)
-        {
-            _logger = loggerFactory.CreateLogger(typeof(ExtensionManager));
-            var extensionsFolder = config.GetExtensionDir(DefaultConfiguration.GetNetworkType(config));
-            var extensions = new List<IBTCPayServerExtension>();
-
-            _logger.LogInformation($"Loading extensions from {extensionsFolder}");
-            Directory.CreateDirectory(extensionsFolder);
-            ExecuteCommands(extensionsFolder);
-            List<(PluginLoader, Assembly, IFileProvider)> plugins = new List<(PluginLoader, Assembly, IFileProvider)>();
-            foreach (var dir in Directory.GetDirectories(extensionsFolder))
-            {
-                var pluginName = Path.GetFileName(dir);
-
-                var plugin = PluginLoader.CreateFromAssemblyFile(
-                    Path.Combine(dir, pluginName + ".dll"), // create a plugin from for the .dll file
-                    config =>
-                        // this ensures that the version of MVC is shared between this app and the plugin
-                        config.PreferSharedTypes = true);
-
-                mvcBuilder.AddPluginLoader(plugin);
-                var pluginAssembly = plugin.LoadDefaultAssembly();
-                _pluginAssemblies.Add(pluginAssembly);
-                var fileProvider = CreateEmbeddedFileProviderForAssembly(pluginAssembly);
-                plugins.Add((plugin, pluginAssembly, fileProvider));
-                extensions.AddRange(GetAllExtensionTypesFromAssembly(pluginAssembly)
-                    .Select(GetExtensionInstanceFromType));
-            }
-
-            foreach (var extension in extensions)
-            {
-                _logger.LogInformation($"Adding and executing extension {extension.Identifier} - {extension.Version}");
-                serviceCollection.AddSingleton(extension);
-                extension.Execute(serviceCollection);
-            }
-
-            return mvcBuilder;
-        }
-
-        public static void UseExtensions(this IApplicationBuilder applicationBuilder)
-        {
-            foreach (var extension in applicationBuilder.ApplicationServices
-                .GetServices<IBTCPayServerExtension>())
-            {
-                extension.Execute(applicationBuilder,
-                    applicationBuilder.ApplicationServices);
-            }
-
-            var webHostEnvironment = applicationBuilder.ApplicationServices.GetService<IWebHostEnvironment>();
-            List<IFileProvider> providers = new List<IFileProvider>() {webHostEnvironment.WebRootFileProvider};
-            providers.AddRange(
-                _pluginAssemblies
-                    .Select(CreateEmbeddedFileProviderForAssembly));
-            webHostEnvironment.WebRootFileProvider = new CompositeFileProvider(providers);
-        }
-
-        private static Type[] GetAllExtensionTypesFromAssembly(Assembly assembly)
-        {
-            return assembly.GetTypes().Where(type =>
-                typeof(IBTCPayServerExtension).IsAssignableFrom(type) &&
-                !type.IsAbstract).ToArray();
-        }
-
-        private static IBTCPayServerExtension GetExtensionInstanceFromType(Type type)
-        {
-            return (IBTCPayServerExtension)Activator.CreateInstance(type, Array.Empty<object>());
-        }
-
-        private static IFileProvider CreateEmbeddedFileProviderForAssembly(Assembly assembly)
-        {
-            return new EmbeddedFileProvider(assembly);
-        }
-
-        private static void ExecuteCommands(string extensionsFolder)
-        {
-            var pendingCommands = GetPendingCommands(extensionsFolder);
-            foreach (var command in pendingCommands)
-            {
-                ExecuteCommand(command, extensionsFolder);
-            }
-            File.Delete(Path.Combine(extensionsFolder, "commands"));
-        }
-
-        private static void ExecuteCommand((string command, string extension) command, string extensionsFolder)
-        {
-            var dirName = Path.Combine(extensionsFolder, command.extension);
-            switch (command.command)
-            {
-                case "delete":
-                    if (Directory.Exists(dirName))
-                    {
-                        Directory.Delete(dirName, true);
-                    }
-                    break;
-                case "install":
-                    var fileName = dirName + BTCPayExtensionSuffix;
-                    if (File.Exists(fileName))
-                    {
-                        ZipFile.ExtractToDirectory(fileName, dirName, true);
-                        File.Delete(fileName);
-                    }
-                    break;
-            }
-        }
-
-        public static (string command, string extension)[] GetPendingCommands(string extensionsFolder)
-        {
-            if (!File.Exists(Path.Combine(extensionsFolder, "commands")))
-                return Array.Empty<(string command, string extension)>();
-            var commands = File.ReadAllLines(Path.Combine(extensionsFolder, "commands"));
-            return commands.Select(s =>
-            {
-                var split = s.Split(':');
-                return (split[0].ToLower(CultureInfo.InvariantCulture), split[1]);
-            }).ToArray();
-        }
-
-        public static void QueueCommands(string extensionsFolder, params ( string action, string extension)[] commands)
-        {
-            File.AppendAllLines(Path.Combine(extensionsFolder, "commands"),
-                commands.Select((tuple) => $"{tuple.action}:{tuple.extension}"));
-        }
-
-        public static void CancelCommands(string extensionDir, string extension)
-        {
-            var cmds = GetPendingCommands(extensionDir).Where(tuple =>
-                !tuple.extension.Equals(extension, StringComparison.InvariantCultureIgnoreCase)).ToArray();
-
-            File.Delete(Path.Combine(extensionDir, "commands"));
-            QueueCommands(extensionDir, cmds);
-
-        }
-    }
-}

BTCPayServer/Components/UIExtensionPoint/Default.cshtml

@@ -0,0 +1,6 @@
+@model IEnumerable<string> 
+
+@foreach (var partial in Model)
+{
+    await Html.RenderPartialAsync(partial);
+}

BTCPayServer/Components/UIExtensionPoint/UIExtensionPoint.cs

@@ -0,0 +1,23 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using BTCPayServer.Contracts;
+using Microsoft.AspNetCore.Mvc;
+
+namespace BTCPayServer.Components.UIExtensionPoint
+{
+    public class UiExtensionPoint : ViewComponent
+    {
+        private readonly IEnumerable<IUIExtension> _uiExtensions;
+
+        public UiExtensionPoint(IEnumerable<IUIExtension> uiExtensions)
+        {
+            _uiExtensions = uiExtensions;
+        }
+
+        public IViewComponentResult Invoke(string location)
+        {
+            return View(_uiExtensions.Where(extension => extension.Location.Equals(location, StringComparison.InvariantCultureIgnoreCase)).Select(extension => extension.Partial));
+        }
+    }
+}

BTCPayServer/Configuration/BTCPayServerOptions.cs

@@ -80,7 +80,7 @@ namespace BTCPayServer.Configuration
         {
             NetworkType = DefaultConfiguration.GetNetworkType(conf);
             DataDir = conf.GetDataDir(NetworkType);
-            ExtensionDir = conf.GetExtensionDir(NetworkType);
+            PluginDir = conf.GetPluginDir(NetworkType);
             Logs.Configuration.LogInformation("Network: " + NetworkType.ToString());
 
             if (conf.GetOrDefault<bool>("launchsettings", false) && NetworkType != NetworkType.Regtest)
@@ -243,7 +243,7 @@ namespace BTCPayServer.Configuration
             DisableRegistration = conf.GetOrDefault<bool>("disable-registration", true);
         }
 
-        public string ExtensionDir { get; set; }
+        public string PluginDir { get; set; }
 
         private SSHSettings ParseSSHConfiguration(IConfiguration conf)
         {

BTCPayServer/Configuration/ConfigurationExtensions.cs

@@ -68,10 +68,10 @@ namespace BTCPayServer.Configuration
             return configuration.GetOrDefault("datadir", defaultSettings.DefaultDataDirectory);
         }
         
-        public static string GetExtensionDir(this IConfiguration configuration, NetworkType networkType) 
+        public static string GetPluginDir(this IConfiguration configuration, NetworkType networkType) 
         {
             var defaultSettings = BTCPayDefaultSettings.GetDefaultSettings(networkType);
-            return configuration.GetOrDefault("extensiondir", defaultSettings.DefaultExtensionDirectory);
+            return configuration.GetOrDefault("plugindir", defaultSettings.DefaultPluginDirectory);
         }
     }
 }

BTCPayServer/Controllers/ServerController.Extensions.cs

@@ -1,123 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Threading.Tasks;
-using BTCPayServer.Configuration;
-using BTCPayServer.Contracts;
-using BTCPayServer.Models;
-using Microsoft.AspNetCore.Http;
-using Microsoft.AspNetCore.Mvc;
-
-namespace BTCPayServer.Controllers
-{
-    public partial class ServerController
-    {
-        [HttpGet("server/extensions")]
-        public async Task<IActionResult> ListExtensions(
-            [FromServices] ExtensionService extensionService,
-            [FromServices] BTCPayServerOptions btcPayServerOptions,
-            string remote = "btcpayserver/btcpayserver-extensions")
-        {
-            IEnumerable<ExtensionService.AvailableExtension> availableExtensions;
-            try
-            {
-                availableExtensions = await extensionService.GetRemoteExtensions(remote);
-            }
-            catch (Exception e)
-            {
-                TempData.SetStatusMessageModel(new StatusMessageModel()
-                {
-                    Severity = StatusMessageModel.StatusSeverity.Error,
-                    Message = "The remote could not be reached"
-                });
-                availableExtensions = Array.Empty<ExtensionService.AvailableExtension>();
-            }
-            var res = new ListExtensionsViewModel()
-            {
-                Installed = extensionService.LoadedExtensions,
-                Available = availableExtensions,
-                Remote = remote,
-                Commands = extensionService.GetPendingCommands(),
-                CanShowRestart = btcPayServerOptions.DockerDeployment
-            };
-            return View(res);
-        }
-
-        public class ListExtensionsViewModel
-        {
-            public string Remote { get; set; }
-            public IEnumerable<IBTCPayServerExtension> Installed { get; set; }
-            public IEnumerable<ExtensionService.AvailableExtension> Available { get; set; }
-            public (string command, string extension)[] Commands { get; set; }
-            public bool CanShowRestart { get; set; }
-        }
-
-        [HttpPost("server/extensions/uninstall")]
-        public IActionResult UnInstallExtension(
-            [FromServices] ExtensionService extensionService, string extension)
-        {
-            extensionService.UninstallExtension(extension);
-            TempData.SetStatusMessageModel(new StatusMessageModel()
-            {
-                Message = "Extension scheduled to be uninstalled",
-                Severity = StatusMessageModel.StatusSeverity.Success
-            });
-
-            return RedirectToAction("ListExtensions");
-        }
-        [HttpPost("server/extensions/cancel")]
-        public IActionResult CancelExtensionCommands(
-            [FromServices] ExtensionService extensionService, string extension)
-        {
-            extensionService.CancelCommands(extension);
-            TempData.SetStatusMessageModel(new StatusMessageModel()
-            {
-                Message = "Updated",
-                Severity = StatusMessageModel.StatusSeverity.Success
-            });
-
-            return RedirectToAction("ListExtensions");
-        }
-
-        [HttpPost("server/extensions/install")]
-        public async Task<IActionResult> InstallExtension(
-            [FromServices] ExtensionService extensionService, string remote, string extension)
-        {
-            try
-            {
-                await extensionService.DownloadRemoteExtension(remote, extension);
-                extensionService.InstallExtension(extension);
-                TempData.SetStatusMessageModel(new StatusMessageModel()
-                {
-                    Message = "Extension scheduled to be installed.",
-                    Severity = StatusMessageModel.StatusSeverity.Success
-                });
-            }
-            catch (Exception e)
-            {
-                TempData.SetStatusMessageModel(new StatusMessageModel()
-                {
-                    Message = "The extension could not be downloaded. Try again later.", Severity = StatusMessageModel.StatusSeverity.Error
-                });
-            }
-
-            return RedirectToAction("ListExtensions");
-        }
-
-
-        [HttpPost("server/extensions/upload")]
-        public async Task<IActionResult> UploadExtension([FromServices] ExtensionService extensionService,
-            List<IFormFile> files)
-        {
-            foreach (var formFile in files.Where(file => file.Length > 0))
-            {
-                await extensionService.UploadExtension(formFile);
-                extensionService.InstallExtension(formFile.FileName.TrimEnd(ExtensionManager.BTCPayExtensionSuffix,
-                    StringComparison.InvariantCultureIgnoreCase));
-            }
-
-            return RedirectToAction("ListExtensions",
-                new {StatusMessage = "Files uploaded, restart server to load extensions"});
-        }
-    }
-}

BTCPayServer/Controllers/ServerController.Plugins.cs

@@ -0,0 +1,124 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using BTCPayServer.Configuration;
+using BTCPayServer.Contracts;
+using BTCPayServer.Models;
+using BTCPayServer.Plugins;
+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Mvc;
+
+namespace BTCPayServer.Controllers
+{
+    public partial class ServerController
+    {
+        [HttpGet("server/plugins")]
+        public async Task<IActionResult> ListPlugins(
+            [FromServices] PluginService pluginService,
+            [FromServices] BTCPayServerOptions btcPayServerOptions,
+            string remote = "btcpayserver/btcpayserver-plugins")
+        {
+            IEnumerable<PluginService.AvailablePlugin> availablePlugins;
+            try
+            {
+                availablePlugins = await pluginService.GetRemotePlugins(remote);
+            }
+            catch (Exception)
+            {
+                TempData.SetStatusMessageModel(new StatusMessageModel()
+                {
+                    Severity = StatusMessageModel.StatusSeverity.Error,
+                    Message = "The remote could not be reached"
+                });
+                availablePlugins = Array.Empty<PluginService.AvailablePlugin>();
+            }
+            var res = new ListPluginsViewModel()
+            {
+                Installed = pluginService.LoadedPlugins,
+                Available = availablePlugins,
+                Remote = remote,
+                Commands = pluginService.GetPendingCommands(),
+                CanShowRestart = btcPayServerOptions.DockerDeployment
+            };
+            return View(res);
+        }
+
+        public class ListPluginsViewModel
+        {
+            public string Remote { get; set; }
+            public IEnumerable<IBTCPayServerPlugin> Installed { get; set; }
+            public IEnumerable<PluginService.AvailablePlugin> Available { get; set; }
+            public (string command, string plugin)[] Commands { get; set; }
+            public bool CanShowRestart { get; set; }
+        }
+
+        [HttpPost("server/plugins/uninstall")]
+        public IActionResult UnInstallPlugin(
+            [FromServices] PluginService pluginService, string plugin)
+        {
+            pluginService.UninstallPlugin(plugin);
+            TempData.SetStatusMessageModel(new StatusMessageModel()
+            {
+                Message = "Plugin scheduled to be uninstalled",
+                Severity = StatusMessageModel.StatusSeverity.Success
+            });
+
+            return RedirectToAction("ListPlugins");
+        }
+        [HttpPost("server/plugins/cancel")]
+        public IActionResult CancelPluginCommands(
+            [FromServices] PluginService pluginService, string plugin)
+        {
+            pluginService.CancelCommands(plugin);
+            TempData.SetStatusMessageModel(new StatusMessageModel()
+            {
+                Message = "Updated",
+                Severity = StatusMessageModel.StatusSeverity.Success
+            });
+
+            return RedirectToAction("ListPlugins");
+        }
+
+        [HttpPost("server/plugins/install")]
+        public async Task<IActionResult> InstallPlugin(
+            [FromServices] PluginService pluginService, string remote, string plugin)
+        {
+            try
+            {
+                await pluginService.DownloadRemotePlugin(remote, plugin);
+                pluginService.InstallPlugin(plugin);
+                TempData.SetStatusMessageModel(new StatusMessageModel()
+                {
+                    Message = "Plugin scheduled to be installed.",
+                    Severity = StatusMessageModel.StatusSeverity.Success
+                });
+            }
+            catch (Exception)
+            {
+                TempData.SetStatusMessageModel(new StatusMessageModel()
+                {
+                    Message = "The plugin could not be downloaded. Try again later.", Severity = StatusMessageModel.StatusSeverity.Error
+                });
+            }
+
+            return RedirectToAction("ListPlugins");
+        }
+
+
+        [HttpPost("server/plugins/upload")]
+        public async Task<IActionResult> UploadPlugin([FromServices] PluginService pluginService,
+            List<IFormFile> files)
+        {
+            foreach (var formFile in files.Where(file => file.Length > 0))
+            {
+                await pluginService.UploadPlugin(formFile);
+                pluginService.InstallPlugin(formFile.FileName.TrimEnd(PluginManager.BTCPayPluginSuffix,
+                    StringComparison.InvariantCultureIgnoreCase));
+            }
+
+            return RedirectToAction("ListPlugins",
+                new {StatusMessage = "Files uploaded, restart server to load plugins"});
+        }
+    }
+}

BTCPayServer/Extensions.cs

@@ -224,15 +224,7 @@ namespace BTCPayServer
             return false;
         }
 
-        public static void SetStatusMessageModel(this ITempDataDictionary tempData, StatusMessageModel statusMessage)
+        
-        {
-            if (statusMessage == null)
-            {
-                tempData.Remove("StatusMessageModel");
-                return;
-            }
-            tempData["StatusMessageModel"] = JObject.FromObject(statusMessage).ToString(Formatting.None);
-        }
 
         public static StatusMessageModel GetStatusMessageModel(this ITempDataDictionary tempData)
         {

BTCPayServer/Hosting/BTCPayServerServices.cs

@@ -12,6 +12,7 @@ using BTCPayServer.Payments;
 using BTCPayServer.Payments.Bitcoin;
 using BTCPayServer.Payments.Lightning;
 using BTCPayServer.Payments.PayJoin;
+using BTCPayServer.Plugins;
 using BTCPayServer.Security;
 using BTCPayServer.Security.Bitpay;
 using BTCPayServer.Security.GreenField;
@@ -83,6 +84,7 @@ namespace BTCPayServer.Hosting
             services.AddEthereumLike();
 #endif
             services.TryAddSingleton<SettingsRepository>();
+            services.TryAddSingleton<ISettingsRepository>(provider => provider.GetService<SettingsRepository>());
             services.TryAddSingleton<LabelFactory>();
             services.TryAddSingleton<TorServices>();
             services.TryAddSingleton<SocketFactory>();
@@ -146,7 +148,7 @@ namespace BTCPayServer.Hosting
             });
 
             services.TryAddSingleton<AppService>();
-            services.AddSingleton<ExtensionService>();
+            services.AddSingleton<PluginService>();
             services.TryAddTransient<Safe>();
             services.TryAddSingleton<Ganss.XSS.HtmlSanitizer>(o =>
             {

BTCPayServer/Hosting/Startup.cs

@@ -6,6 +6,7 @@ using BTCPayServer.Data;
 using BTCPayServer.Filters;
 using BTCPayServer.Logging;
 using BTCPayServer.PaymentRequest;
+using BTCPayServer.Plugins;
 using BTCPayServer.Security;
 using BTCPayServer.Services.Apps;
 using BTCPayServer.Storage;
@@ -91,7 +92,7 @@ namespace BTCPayServer.Hosting
 #if RAZOR_RUNTIME_COMPILE
             .AddRazorRuntimeCompilation()
 #endif
-            .AddExtensions(services, Configuration, LoggerFactory)
+            .AddPlugins(services, Configuration, LoggerFactory)
             .AddControllersAsServices();
 
             
@@ -178,7 +179,7 @@ namespace BTCPayServer.Hosting
         private static void ConfigureCore(IApplicationBuilder app, IWebHostEnvironment env, IServiceProvider prov, ILoggerFactory loggerFactory, BTCPayServerOptions options)
         {
             Logs.Configure(loggerFactory);
-            app.UseExtensions();
+            app.UsePlugins();
             if (env.IsDevelopment())
             {
                 app.UseDeveloperExceptionPage();

BTCPayServer/Plugins/PluginManager.cs

@@ -0,0 +1,184 @@
+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using System.IO;
+using System.IO.Compression;
+using System.Linq;
+using System.Reflection;
+using BTCPayServer.Configuration;
+using BTCPayServer.Contracts;
+using McMaster.NETCore.Plugins;
+using Microsoft.AspNetCore.Builder;
+using Microsoft.AspNetCore.Hosting;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.FileProviders;
+using Microsoft.Extensions.Logging;
+
+namespace BTCPayServer.Plugins
+{
+    public static class PluginManager
+    {
+        public const string BTCPayPluginSuffix = ".btcpay";
+        private static readonly List<Assembly> _pluginAssemblies = new List<Assembly>();
+        private static ILogger _logger;
+
+        public static IMvcBuilder AddPlugins(this IMvcBuilder mvcBuilder, IServiceCollection serviceCollection,
+            IConfiguration config, ILoggerFactory loggerFactory)
+        {
+            _logger = loggerFactory.CreateLogger(typeof(PluginManager));
+            var pluginsFolder = config.GetPluginDir(DefaultConfiguration.GetNetworkType(config));
+            var plugins = new List<IBTCPayServerPlugin>();
+
+            _logger.LogInformation($"Loading plugins from {pluginsFolder}");
+            Directory.CreateDirectory(pluginsFolder);
+            ExecuteCommands(pluginsFolder);
+            List<(PluginLoader, Assembly, IFileProvider)> loadedPlugins = new List<(PluginLoader, Assembly, IFileProvider)>();
+            var systemExtensions = GetDefaultLoadedPluginAssemblies();
+            plugins.AddRange(systemExtensions.SelectMany(assembly =>
+                GetAllPluginTypesFromAssembly(assembly).Select(GetPluginInstanceFromType)));
+            foreach (IBTCPayServerPlugin btcPayServerExtension in plugins)
+            {
+                btcPayServerExtension.SystemPlugin = true;
+            }
+            foreach (var dir in Directory.GetDirectories(pluginsFolder))
+            {
+                var pluginName = Path.GetFileName(dir);
+
+                var plugin = PluginLoader.CreateFromAssemblyFile(
+                    Path.Combine(dir, pluginName + ".dll"), // create a plugin from for the .dll file
+                    config =>
+                        // this ensures that the version of MVC is shared between this app and the plugin
+                        config.PreferSharedTypes = true);
+
+                mvcBuilder.AddPluginLoader(plugin);
+                var pluginAssembly = plugin.LoadDefaultAssembly();
+                _pluginAssemblies.Add(pluginAssembly);
+                var fileProvider = CreateEmbeddedFileProviderForAssembly(pluginAssembly);
+                loadedPlugins.Add((plugin, pluginAssembly, fileProvider));
+                plugins.AddRange(GetAllPluginTypesFromAssembly(pluginAssembly)
+                    .Select(GetPluginInstanceFromType));
+            }
+
+            foreach (var plugin in plugins)
+            {
+                try
+                {
+                    _logger.LogInformation(
+                        $"Adding and executing plugin {plugin.Identifier} - {plugin.Version}");
+                    plugin.Execute(serviceCollection);
+                    serviceCollection.AddSingleton(plugin);
+                }
+                catch (Exception e)
+                {
+                    _logger.LogError($"Error when loading plugin {plugin.Identifier} - {plugin.Version}{Environment.NewLine}{e.Message}");
+                }
+            }
+
+            return mvcBuilder;
+        }
+
+        public static void UsePlugins(this IApplicationBuilder applicationBuilder)
+        {
+            foreach (var extension in applicationBuilder.ApplicationServices
+                .GetServices<IBTCPayServerPlugin>())
+            {
+                extension.Execute(applicationBuilder,
+                    applicationBuilder.ApplicationServices);
+            }
+
+            var webHostEnvironment = applicationBuilder.ApplicationServices.GetService<IWebHostEnvironment>();
+            List<IFileProvider> providers = new List<IFileProvider>() {webHostEnvironment.WebRootFileProvider};
+            providers.AddRange(
+                _pluginAssemblies
+                    .Select(CreateEmbeddedFileProviderForAssembly));
+            webHostEnvironment.WebRootFileProvider = new CompositeFileProvider(providers);
+        }
+        private static Assembly[] GetDefaultLoadedPluginAssemblies()
+        {
+            return AppDomain.CurrentDomain.GetAssemblies().Where(assembly =>
+                    assembly?.FullName?.StartsWith("BTCPayServer.Plugins",
+                        StringComparison.InvariantCultureIgnoreCase) is true)
+                .ToArray();
+        }
+
+        private static Type[] GetAllPluginTypesFromAssembly(Assembly assembly)
+        {
+            return assembly.GetTypes().Where(type =>
+                typeof(IBTCPayServerPlugin).IsAssignableFrom(type) &&
+                !type.IsAbstract).ToArray();
+        }
+
+        private static IBTCPayServerPlugin GetPluginInstanceFromType(Type type)
+        {
+            return (IBTCPayServerPlugin)Activator.CreateInstance(type, Array.Empty<object>());
+        }
+
+        private static IFileProvider CreateEmbeddedFileProviderForAssembly(Assembly assembly)
+        {
+            return new EmbeddedFileProvider(assembly);
+        }
+
+        private static void ExecuteCommands(string pluginsFolder)
+        {
+            var pendingCommands = GetPendingCommands(pluginsFolder);
+            foreach (var command in pendingCommands)
+            {
+                ExecuteCommand(command, pluginsFolder);
+            }
+
+            File.Delete(Path.Combine(pluginsFolder, "commands"));
+        }
+
+        private static void ExecuteCommand((string command, string extension) command, string pluginsFolder)
+        {
+            var dirName = Path.Combine(pluginsFolder, command.extension);
+            switch (command.command)
+            {
+                case "delete":
+                    if (Directory.Exists(dirName))
+                    {
+                        Directory.Delete(dirName, true);
+                    }
+
+                    break;
+                case "install":
+                    var fileName = dirName + BTCPayPluginSuffix;
+                    if (File.Exists(fileName))
+                    {
+                        ZipFile.ExtractToDirectory(fileName, dirName, true);
+                        File.Delete(fileName);
+                    }
+
+                    break;
+            }
+        }
+
+        public static (string command, string plugin)[] GetPendingCommands(string pluginsFolder)
+        {
+            if (!File.Exists(Path.Combine(pluginsFolder, "commands")))
+                return Array.Empty<(string command, string plugin)>();
+            var commands = File.ReadAllLines(Path.Combine(pluginsFolder, "commands"));
+            return commands.Select(s =>
+            {
+                var split = s.Split(':');
+                return (split[0].ToLower(CultureInfo.InvariantCulture), split[1]);
+            }).ToArray();
+        }
+
+        public static void QueueCommands(string pluginsFolder, params ( string action, string plugin)[] commands)
+        {
+            File.AppendAllLines(Path.Combine(pluginsFolder, "commands"),
+                commands.Select((tuple) => $"{tuple.action}:{tuple.plugin}"));
+        }
+
+        public static void CancelCommands(string pluginDir, string plugin)
+        {
+            var cmds = GetPendingCommands(pluginDir).Where(tuple =>
+                !tuple.plugin.Equals(plugin, StringComparison.InvariantCultureIgnoreCase)).ToArray();
+
+            File.Delete(Path.Combine(pluginDir, "commands"));
+            QueueCommands(pluginDir, cmds);
+        }
+    }
+}

BTCPayServer/Plugins/PluginService.cs

@@ -13,46 +13,46 @@ using Microsoft.AspNetCore.Http;
 using Microsoft.Extensions.DependencyInjection;
 using Newtonsoft.Json;
 
-namespace BTCPayServer
+namespace BTCPayServer.Plugins
 {
-    public class ExtensionService
+    public class PluginService
     {
         private readonly BTCPayServerOptions _btcPayServerOptions;
         private readonly HttpClient _githubClient;
 
-        public ExtensionService(IEnumerable<IBTCPayServerExtension> btcPayServerExtensions,
+        public PluginService(IEnumerable<IBTCPayServerPlugin> btcPayServerPlugins,
             IHttpClientFactory httpClientFactory, BTCPayServerOptions btcPayServerOptions)
         {
-            LoadedExtensions = btcPayServerExtensions;
+            LoadedPlugins = btcPayServerPlugins;
             _githubClient = httpClientFactory.CreateClient();
             _githubClient.DefaultRequestHeaders.UserAgent.Add(new ProductInfoHeaderValue("btcpayserver", "1"));
             _btcPayServerOptions = btcPayServerOptions;
         }
 
-        public IEnumerable<IBTCPayServerExtension> LoadedExtensions { get; }
+        public IEnumerable<IBTCPayServerPlugin> LoadedPlugins { get; }
 
-        public async Task<IEnumerable<AvailableExtension>> GetRemoteExtensions(string remote)
+        public async Task<IEnumerable<AvailablePlugin>> GetRemotePlugins(string remote)
         {
             var resp = await _githubClient
                 .GetStringAsync(new Uri($"https://api.github.com/repos/{remote}/contents"));
             var files = JsonConvert.DeserializeObject<GithubFile[]>(resp);
-            return await Task.WhenAll(files.Where(file => file.Name.EndsWith($"{ExtensionManager.BTCPayExtensionSuffix}.json", StringComparison.InvariantCulture)).Select(async file =>
+            return await Task.WhenAll(files.Where(file => file.Name.EndsWith($"{PluginManager.BTCPayPluginSuffix}.json", StringComparison.InvariantCulture)).Select(async file =>
             {
                 return await _githubClient.GetStringAsync(file.DownloadUrl).ContinueWith(
-                    task => JsonConvert.DeserializeObject<AvailableExtension>(task.Result), TaskScheduler.Current);
+                    task => JsonConvert.DeserializeObject<AvailablePlugin>(task.Result), TaskScheduler.Current);
             }));
         }
 
-        public async Task DownloadRemoteExtension(string remote, string extension)
+        public async Task DownloadRemotePlugin(string remote, string plugin)
         {
-            var dest = _btcPayServerOptions.ExtensionDir;
+            var dest = _btcPayServerOptions.PluginDir;
             var resp = await _githubClient
                 .GetStringAsync(new Uri($"https://api.github.com/repos/{remote}/contents"));
             var files = JsonConvert.DeserializeObject<GithubFile[]>(resp);
-            var ext = files.SingleOrDefault(file => file.Name == $"{extension}{ExtensionManager.BTCPayExtensionSuffix}");
+            var ext = files.SingleOrDefault(file => file.Name == $"{plugin}{PluginManager.BTCPayPluginSuffix}");
             if (ext is null)
             {
-                throw new Exception("Extension not found on remote");
+                throw new Exception("Plugin not found on remote");
             }
 
             var filedest = Path.Combine(dest, ext.Name);
@@ -60,37 +60,40 @@ namespace BTCPayServer
             new WebClient().DownloadFile(new Uri(ext.DownloadUrl), filedest);
         }
 
-        public void InstallExtension(string extension)
+        public void InstallPlugin(string plugin)
         {
-            var dest = _btcPayServerOptions.ExtensionDir;
+            var dest = _btcPayServerOptions.PluginDir;
-            UninstallExtension(extension);
+            UninstallPlugin(plugin);
-            ExtensionManager.QueueCommands(dest, ("install", extension));
+            PluginManager.QueueCommands(dest, ("install", plugin));
         }
 
-        public async Task UploadExtension(IFormFile extension)
+        public async Task UploadPlugin(IFormFile plugin)
         {
-            var dest = _btcPayServerOptions.ExtensionDir;
+            var dest = _btcPayServerOptions.PluginDir;
-            var filedest = Path.Combine(dest, extension.FileName);
+            var filedest = Path.Combine(dest, plugin.FileName);
             Directory.CreateDirectory(Path.GetDirectoryName(filedest));
-            if (Path.GetExtension(filedest) == ExtensionManager.BTCPayExtensionSuffix)
+            if (Path.GetExtension(filedest) == PluginManager.BTCPayPluginSuffix)
             {
                 await using var stream = new FileStream(filedest, FileMode.Create);
-                await extension.CopyToAsync(stream);
+                await plugin.CopyToAsync(stream);
             }
         }
 
-        public void UninstallExtension(string extension)
+        public void UninstallPlugin(string plugin)
         {
-            var dest = _btcPayServerOptions.ExtensionDir;
+            var dest = _btcPayServerOptions.PluginDir;
-            ExtensionManager.QueueCommands(dest, ("delete", extension));
+            PluginManager.QueueCommands(dest, ("delete", plugin));
         }
 
-        public class AvailableExtension : IBTCPayServerExtension
+        public class AvailablePlugin : IBTCPayServerPlugin
         {
             public string Identifier { get; set; }
             public string Name { get; set; }
             public Version Version { get; set; }
             public string Description { get; set; }
+            public bool SystemPlugin { get; set; } = false;
+
+            public string[] Dependencies { get; } = Array.Empty<string>();
 
             public void Execute(IApplicationBuilder applicationBuilder,
                 IServiceProvider applicationBuilderApplicationServices)
@@ -111,14 +114,14 @@ namespace BTCPayServer
             [JsonProperty("download_url")] public string DownloadUrl { get; set; }
         }
 
-        public (string command, string extension)[] GetPendingCommands()
+        public (string command, string plugin)[] GetPendingCommands()
         {
-            return ExtensionManager.GetPendingCommands(_btcPayServerOptions.ExtensionDir);
+            return PluginManager.GetPendingCommands(_btcPayServerOptions.PluginDir);
         }
 
-        public  void CancelCommands(string extension)
+        public  void CancelCommands(string plugin)
         {
-            ExtensionManager.CancelCommands(_btcPayServerOptions.ExtensionDir, extension);
+            PluginManager.CancelCommands(_btcPayServerOptions.PluginDir, plugin);
         }
     }
 }

BTCPayServer/Services/Altcoins/Ethereum/EthereumLikeExtensions.cs

@@ -21,7 +21,8 @@ namespace BTCPayServer.Services.Altcoins.Ethereum
             serviceCollection.AddSingleton<IHostedService, EthereumService>(provider => provider.GetService<EthereumService>());
             serviceCollection.AddSingleton<EthereumLikePaymentMethodHandler>();
             serviceCollection.AddSingleton<IPaymentMethodHandler>(provider => provider.GetService<EthereumLikePaymentMethodHandler>());
-            serviceCollection.AddSingleton<INavExtension, EthereumNavExtension>();
+            
+            serviceCollection.AddSingleton<IUIExtension>(new UIExtension("Ethereum/StoreNavEthereumExtension",  "store-nav"));
             serviceCollection.AddTransient<NoRedirectHttpClientHandler>();
             serviceCollection.AddSingleton<ISyncSummaryProvider, EthereumSyncSummaryProvider>();
             serviceCollection.AddHttpClient(EthereumInvoiceCreateHttpClient)

BTCPayServer/Services/Altcoins/Ethereum/EthereumStoreNavExtension.cs

@@ -1,12 +0,0 @@
-#if ALTCOINS
-using BTCPayServer.Contracts;
-
-namespace BTCPayServer.Services.Altcoins.Ethereum
-{
-    public class EthereumNavExtension: INavExtension
-    {
-        public string Partial { get; } = "Ethereum/StoreNavEthereumExtension";
-        public string Location { get; } = "store";
-    }
-}
-#endif

BTCPayServer/Services/Altcoins/Monero/MoneroLikeExtensions.cs

@@ -23,7 +23,7 @@ namespace BTCPayServer.Services.Altcoins.Monero
             serviceCollection.AddHostedService<MoneroListener>();
             serviceCollection.AddSingleton<MoneroLikePaymentMethodHandler>();
             serviceCollection.AddSingleton<IPaymentMethodHandler>(provider => provider.GetService<MoneroLikePaymentMethodHandler>());
-            serviceCollection.AddSingleton<INavExtension, MoneroNavExtension>();
+            serviceCollection.AddSingleton<IUIExtension>(new UIExtension("Monero/StoreNavMoneroExtension",  "store-nav"));
             serviceCollection.AddSingleton<ISyncSummaryProvider, MoneroSyncSummaryProvider>();
 
             return serviceCollection;

BTCPayServer/Services/Altcoins/Monero/MoneroStoreNavExtension.cs

@@ -1,12 +0,0 @@
-#if ALTCOINS
-using BTCPayServer.Contracts;
-
-namespace BTCPayServer.Services.Altcoins.Monero
-{
-    public class MoneroNavExtension : INavExtension
-    {
-        public string Partial { get; } = "Monero/StoreNavMoneroExtension";
-        public string Location { get; } = "store";
-    }
-}
-#endif

BTCPayServer/Services/SettingsRepository.cs

@@ -7,7 +7,7 @@ using Newtonsoft.Json;
 
 namespace BTCPayServer.Services
 {
-    public class SettingsRepository
+    public class SettingsRepository : ISettingsRepository
     {
         private readonly ApplicationDbContextFactory _ContextFactory;
         private readonly EventAggregator _EventAggregator;

BTCPayServer/Views/Manage/_Nav.cshtml

@@ -7,5 +7,6 @@
     <a id="@ManageNavPages.U2F.ToString()" class="nav-link @ViewData.IsActivePage(ManageNavPages.U2F)" asp-action="U2FAuthentication">U2F Authentication</a>
     <a id="@ManageNavPages.APIKeys.ToString()" class="nav-link @ViewData.IsActivePage(ManageNavPages.APIKeys)" asp-action="APIKeys">API Keys</a>
     <a id="@ManageNavPages.Notifications.ToString()" class="nav-link @ViewData.IsActivePage(ManageNavPages.Notifications)" asp-action="NotificationSettings">Notifications</a>
+    <vc:ui-extension-point location="user-nav" />
 </div>
 

BTCPayServer/Views/Server/ListExtensions.cshtml

@@ -1,152 +0,0 @@
-@model BTCPayServer.Controllers.ServerController.ListExtensionsViewModel 
-@{
-    ViewData.SetActivePageAndTitle(ServerNavPages.Extensions);
-    var installed = Model.Installed.Select(extension => extension.Identifier);
-    var availableAndNotInstalled = Model.Available.Where(extension => !installed.Contains(extension.Identifier));
-}
-
-@if (Model.Commands.Any())
-{
-    <div class="alert alert-info">
-        You need to restart BTCPay Server in order to update your active extensions.
-        @if (Model.CanShowRestart)
-        {
-            <form method="post" asp-action="Maintenance">
-                <button type="submit" name="command" value="restart" class="btn btn-outline-info alert-link" asp-action="Maintenance">Restart now</button>
-            </form>
-        }
-    </div>
-}
-<partial name="_StatusMessage"/>
-
-@if (Model.Installed.Any())
-{
-    <h4>Installed Extensions</h4>
-    <div class="card-columns">
-
-        @foreach (var extension in Model.Installed)
-        {
-            var matchedAvailable = Model.Available.SingleOrDefault(availableExtension => availableExtension.Identifier == extension.Identifier);
-            <div class="card">
-                <div class="card-body">
-                    <h3 class="card-title">
-                        @extension.Name <span class="badge badge-secondary">@extension.Version</span>
-                    </h3>
-                    <p class="card-text">@extension.Description</p>
-
-                </div>
-                @if (matchedAvailable != null)
-                {
-                    <ul class="list-group list-group-flush">
-                        <li class="list-group-item d-flex justify-content-between">
-                            <span>Current version</span>
-                            <span>@extension.Version</span>
-                        </li>
-                        <li class="list-group-item d-flex justify-content-between">
-                            <span>Remote version</span>
-                            <span>@matchedAvailable.Version</span>
-                        </li>
-                    </ul>
-                    <div class="card-footer">
-                        @if (Model.Commands.Any(tuple => tuple.extension.Equals(extension.Identifier, StringComparison.InvariantCultureIgnoreCase)))
-                        {
-                            <div class="d-flex justify-content-between">
-                                <div>
-                                    <div class="badge badge-info">pending action</div></div>
-                                <form asp-action="CancelExtensionCommands" asp-route-extension="@extension.Identifier">
-                                    <button type="submit" class="btn btn-link pt-0">Cancel</button>
-                                </form>
-                            </div>
-                        }
-                        else
-                        {
-                            <form asp-action="UnInstallExtension" asp-route-extension="@extension.Identifier">
-                                <button type="submit" class="btn btn-link">Uninstall</button>
-                            </form>
-                            @if (extension.Version < matchedAvailable.Version)
-                            {
-                                <form asp-action="InstallExtension" asp-route-extension="@extension.Identifier" asp-route-remote="@Model.Remote">
-                                    <button type="submit" class="btn btn-link">Update</button>
-                                </form>
-                            }
-                        }
-
-                    </div>
-                }
-
-            </div>
-        }
-    </div>
-}
-@if (availableAndNotInstalled.Any())
-{
-    <h4>Available Extensions</h4>
-
-    <div class="card-columns">
-        @foreach (var extension in availableAndNotInstalled)
-        {
-            <div class="card">
-                <div class="card-body">
-                    <h3 class="card-title">
-                        @extension.Name <span class="badge badge-secondary">@extension.Version</span>
-                    </h3>
-                    <p class="card-text">@extension.Description</p>
-                </div>
-                <div class="card-footer py-0 text-right">
-                    @if (Model.Commands.Any(tuple => tuple.extension.Equals(extension.Identifier, StringComparison.InvariantCultureIgnoreCase)))
-                    {
-                        <div class="d-flex justify-content-between">
-                                <div>
-                                <div class="badge badge-info">pending action</div></div>
-                            <form asp-action="CancelExtensionCommands" asp-route-extension="@extension.Identifier">
-                                <button type="submit" class="btn btn-link pt-0">Cancel</button>
-                            </form>
-                        </div>
-                    }
-                    else
-                    {
-                        <form asp-action="InstallExtension" asp-route-extension="@extension.Identifier" asp-route-remote="@Model.Remote">
-                            <button type="submit" class="btn btn-link">Install</button>
-                        </form>
-                    }
-                </div>
-            </div>
-        }
-    </div>
-}
-
-<button class="btn btn-link mt-4" type="button" data-toggle="collapse" data-target="#manual-upload">
-    Upload extension
-</button>
-<div class="collapse" id="manual-upload">
-    <div class="card">
-        <div class="card-body">
-            <h3 class="card-title">Add extension manually</h3>
-            <div class="alert alert-warning">This is an extremely dangerous operation. Do not upload extensions from someone that you do not trust.</div>
-            <form method="post" enctype="multipart/form-data" asp-action="UploadExtension">
-                <div class="form-group">
-                    <input type="file" name="files" accept=".btcpay" id="files"/>
-                    <button class="btn btn-primary" type="submit">Upload</button>
-                </div>
-            </form>
-        </div>
-    </div>
-</div>
-
-@section Scripts {
-    <script>
-            $(document).ready(function () {
-
-                $('.custom-file-input').on('change',
-                    function () {
-                        var label = $(this).next('label');
-                        if (document.getElementById("file").files.length > 0) {
-                            var fileName = document.getElementById("file").files[0].name;
-                            label.addClass("selected").html(fileName);
-                        } else {
-                            label.removeClass("selected").html("Choose file");
-                        }
-                    });
-            });
-        </script>
-}

BTCPayServer/Views/Server/ListPlugins.cshtml

@@ -0,0 +1,199 @@
+@model BTCPayServer.Controllers.ServerController.ListPluginsViewModel 
+@{
+    ViewData.SetActivePageAndTitle(ServerNavPages.Plugins);
+    var installed = Model.Installed.Select(plugin => plugin.Identifier);
+    var availableAndNotInstalled = Model.Available.Where(plugin => !installed.Contains(plugin.Identifier));
+}
+
+@if (Model.Commands.Any())
+{
+    <div class="alert alert-info">
+        You need to restart BTCPay Server in order to update your active plugins.
+        @if (Model.CanShowRestart)
+        {
+            <form method="post" asp-action="Maintenance">
+                <button type="submit" name="command" value="restart" class="btn btn-outline-info alert-link" asp-action="Maintenance">Restart now</button>
+            </form>
+        }
+    </div>
+}
+<partial name="_StatusMessage"/>
+
+@if (Model.Installed.Any())
+{
+    <h4>Installed Plugins</h4>
+    <div class="card-columns">
+
+        @foreach (var plugin in Model.Installed)
+        {
+            var matchedAvailable = Model.Available.SingleOrDefault(availablePlugin => availablePlugin.Identifier == plugin.Identifier);
+            <div class="card">
+                <div class="card-body">
+                    <h3 class="card-title">
+                        @plugin.Name <span class="badge badge-secondary">@plugin.Version</span>
+                    </h3>
+                    <p class="card-text">@plugin.Description</p>
+
+                </div>
+                @if (!plugin.SystemPlugin)
+                {
+                    <ul class="list-group list-group-flush">
+                        <li class="list-group-item d-flex justify-content-between">
+                            <span>Current version</span>
+                            <span>@plugin.Version</span>
+                        </li>
+                        @if (matchedAvailable != null)
+                        {
+                            <li class="list-group-item d-flex justify-content-between">
+                                <span>Remote version</span>
+                                <span>@matchedAvailable.Version</span>
+                            </li>
+                        }
+                    </ul>
+                    <div class="card-footer">
+                        @if (Model.Commands.Any(tuple => tuple.plugin.Equals(plugin.Identifier, StringComparison.InvariantCultureIgnoreCase)))
+                        {
+                            <div class="d-flex justify-content-between">
+                                <div>
+                                    <div class="badge badge-info">pending action</div>
+                                </div>
+                                <form asp-action="CancelPluginCommands" asp-route-plugin="@plugin.Identifier">
+                                    <button type="submit" class="btn btn-link pt-0">Cancel</button>
+                                </form>
+                            </div>
+                        }
+                        else
+                        {
+                            <form asp-action="UnInstallPlugin" asp-route-plugin="@plugin.Identifier">
+                                <button type="submit" class="btn btn-link  pt-0">Uninstall</button>
+                            </form>
+
+                            @if (matchedAvailable != null && plugin.Version < matchedAvailable.Version)
+                            {
+                                <form asp-action="InstallPlugin" asp-route-plugin="@plugin.Identifier" asp-route-remote="@Model.Remote">
+                                    <button type="submit" class="btn btn-link  pt-0">Update</button>
+                                </form>
+                            }
+                        }
+                    </div>
+                }
+                else if (plugin.SystemPlugin)
+                {
+                    <div class="card-footer">
+                        <div class="d-flex justify-content-between">
+                            <div>
+                                <div class="badge badge-info">system plugin</div>
+                            </div>
+                        </div>
+                    </div>
+                }
+
+            </div>
+        }
+    </div>
+}
+@if (availableAndNotInstalled.Any())
+{
+    <h4>Available Plugins</h4>
+
+    <div class="card-columns">
+        @foreach (var plugin in availableAndNotInstalled)
+        {
+            <div class="card">
+                <div class="card-body">
+                    <h3 class="card-title">
+                        @plugin.Name <span class="badge badge-secondary">@plugin.Version</span>
+                    </h3>
+                    <p class="card-text">@plugin.Description</p>
+                </div>
+                <div class="card-footer">
+                    @if (Model.Commands.Any(tuple => tuple.plugin.Equals(plugin.Identifier, StringComparison.InvariantCultureIgnoreCase)))
+                    {
+                        <div class="d-flex justify-content-between">
+                            <div>
+                                <div class="badge badge-info">pending action</div>
+                            </div>
+                            <form asp-action="CancelPluginCommands" asp-route-plugin="@plugin.Identifier">
+                                <button type="submit" class="btn btn-link pt-0">Cancel</button>
+                            </form>
+                        </div>
+                    }
+                    else
+                    {
+                        <form asp-action="InstallPlugin" asp-route-plugin="@plugin.Identifier" asp-route-remote="@Model.Remote">
+                            <button type="submit" class="btn btn-link  pt-0">Install</button>
+                        </form>
+                    }
+                </div>
+            </div>
+        }
+    </div>
+}
+<button class="btn btn-link mt-4" type="button" data-toggle="collapse" data-target="#manual-upload">
+    Upload plugin
+</button>
+<div class="collapse" id="manual-upload">
+    <div class="card">
+        <div class="card-body">
+            <h3 class="card-title">Add plugin manually</h3>
+            <div class="alert alert-warning">This is an extremely dangerous operation. Do not upload plugins from someone that you do not trust.</div>
+            <form method="post" enctype="multipart/form-data" asp-action="UploadPlugin">
+
+                <div class="form-group">
+                    <div class="custom-file">
+                        <input type="file" class="custom-file-input" required name="files" accept=".btcpay" id="files">
+                        <label class="custom-file-label" for="files">Choose file</label>
+                    </div>
+                </div>
+                <div class="form-group">
+                    <button class="btn btn-primary" type="submit">Upload</button>
+                </div>
+            </form>
+        </div>
+    </div>
+</div>
+@if (Model.Commands.Any())
+{
+    <button class="btn btn-link mt-4" type="button" data-toggle="collapse" data-target="#pending-actions">
+        Pending
+    </button>
+    <div class="collapse" id="pending-actions">
+        <div class="card">
+            <div class="card-body">
+                <h3 class="card-title">Pending actions</h3>
+                <ul class="list-group list-group-flush">
+                    @foreach (var extComm in Model.Commands.GroupBy(tuple => tuple.plugin))
+                    {
+                        <li class="list-group-item">
+                            <div class="d-flex justify-content-between">
+                                @extComm.Key (@extComm.Last().command)
+                                <form asp-action="CancelPluginCommands" asp-route-plugin="@extComm.Key">
+                                    <button type="submit" class="btn btn-link pt-0">Cancel</button>
+                                </form>
+                            </div>
+                        </li>
+                    }
+                </ul>
+            </div>
+        </div>
+    </div>
+}
+
+@section Scripts {
+    <script>
+            $(document).ready(function () {
+
+                $('.custom-file-input').on('change',
+                    function () {
+                        var label = $(this).next('label');
+                        var el = $(this).get(0);
+                        if (el.files.length > 0) {
+                            var fileName = el.files[0].name;
+                            label.addClass("selected").html(fileName);
+                        } else {
+                            label.removeClass("selected").html("Choose file");
+                        }
+                    });
+            });
+        </script>
+}

BTCPayServer/Views/Server/ServerNavPages.cs

@@ -2,6 +2,6 @@ namespace BTCPayServer.Views.Server
 {
     public enum ServerNavPages
     {
-        Index, Users, Emails, Policies, Theme, Services, Maintenance, Logs, Files, Extensions
+        Index, Users, Emails, Policies, Theme, Services, Maintenance, Logs, Files, Plugins
     }
 }

BTCPayServer/Views/Server/_Nav.cshtml

@@ -12,5 +12,6 @@
     }
     <a asp-controller="Server" id="Server-@ServerNavPages.Logs" class="nav-link @ViewData.IsActivePage(ServerNavPages.Logs)" asp-action="LogsView">Logs</a>
     <a asp-controller="Server" id="Server-@ServerNavPages.Files" class="nav-link @ViewData.IsActivePage(ServerNavPages.Files)" asp-action="Files">Files</a>
-    <a asp-controller="Server" id="Server-@ServerNavPages.Extensions" class="nav-link @ViewData.IsActivePage(ServerNavPages.Extensions)" asp-action="ListExtensions">Extensions (experimental)</a>
+    <a asp-controller="Server" id="Server-@ServerNavPages.Plugins" class="nav-link @ViewData.IsActivePage(ServerNavPages.Plugins)" asp-action="ListPlugins">Plugins (experimental)</a>
+    <vc:ui-extension-point location="server-nav" />
 </div>

BTCPayServer/Views/Shared/_Layout.cshtml

@@ -40,12 +40,7 @@
             </button>
             <div class="collapse navbar-collapse" id="navbarResponsive">
                 <ul class="navbar-nav ml-auto">
-                @inject IEnumerable<BTCPayServer.Contracts.INavExtension> Extensions;
+                    <vc:ui-extension-point location="header-nav" />
-                        @foreach (var extension in Extensions.Where(extension => extension.Location == "header-nav"))
-                        {
-                            <partial name="@extension.Partial"/>
-                        }
-                    
                     @if (SignInManager.IsSignedIn(User))
                     {
                         if (User.IsInRole(Roles.ServerAdmin))

BTCPayServer/Views/Stores/_Nav.cshtml

@@ -6,11 +6,7 @@
     <a id="@(nameof(StoreNavPages.Users))" class="nav-link @ViewData.IsActivePage(StoreNavPages.Users)" asp-controller="Stores" asp-action="StoreUsers" asp-route-storeId="@this.Context.GetRouteValue("storeId")">Users</a>
     <a id="@(nameof(StoreNavPages.PayButton))" class="nav-link @ViewData.IsActivePage(StoreNavPages.PayButton)" asp-controller="Stores" asp-action="PayButton" asp-route-storeId="@this.Context.GetRouteValue("storeId")">Pay Button</a>
     <a id="@(nameof(StoreNavPages.Integrations))" class="nav-link @ViewData.IsActivePage(StoreNavPages.Integrations)" asp-controller="Stores" asp-action="Integrations" asp-route-storeId="@this.Context.GetRouteValue("storeId")">Integrations</a>
-    @inject IEnumerable<BTCPayServer.Contracts.INavExtension> Extensions;
+    <vc:ui-extension-point location="store-nav" />
-    @foreach (var extension in Extensions.Where(extension => extension.Location == "store"))
-    {
-        <partial name="@extension.Partial" />
-    }
 </div>
 
 <script type="text/javascript">

BTCPayServer/Views/ViewsRazor.cs

@@ -18,6 +18,10 @@ namespace BTCPayServer.Views
         public static string IsActivePage<T>(this ViewDataDictionary viewData, T page)
             where T : IConvertible
         {
+            if (!viewData.ContainsKey(ACTIVE_PAGE_KEY))
+            {
+                return null;
+            }
             var activePage = (T)viewData[ACTIVE_PAGE_KEY];
             return page.Equals(activePage) ? "active" : null;
         }

BTCPayServer/Views/Wallets/_Nav.cshtml

@@ -1,22 +1,23 @@
 @inject SignInManager<ApplicationUser> SignInManager
 @inject BTCPayNetworkProvider BtcPayNetworkProvider
 @{
-    var wallet = WalletId.Parse( this.Context.GetRouteValue("walletId").ToString());
+    var wallet = WalletId.Parse(this.Context.GetRouteValue("walletId").ToString());
     var network = BtcPayNetworkProvider.GetNetwork<BTCPayNetwork>(wallet.CryptoCode);
 }
-    <div class="nav flex-column nav-pills mb-4">
+<div class="nav flex-column nav-pills mb-4">
-        <a class="nav-link @ViewData.IsActivePage(WalletsNavPages.Transactions)" asp-action="WalletTransactions" asp-route-walletId="@this.Context.GetRouteValue("walletId")" id="WalletTransactions">Transactions</a>
+    <a class="nav-link @ViewData.IsActivePage(WalletsNavPages.Transactions)" asp-action="WalletTransactions" asp-route-walletId="@this.Context.GetRouteValue("walletId")" id="WalletTransactions">Transactions</a>
-        @if (!network.ReadonlyWallet)
+    @if (!network.ReadonlyWallet)
-        {
+    {
-            <a class="nav-link @ViewData.IsActivePage(WalletsNavPages.Send)" asp-action="WalletSend" asp-route-walletId="@this.Context.GetRouteValue("walletId")" id="WalletSend">Send</a>
+        <a class="nav-link @ViewData.IsActivePage(WalletsNavPages.Send)" asp-action="WalletSend" asp-route-walletId="@this.Context.GetRouteValue("walletId")" id="WalletSend">Send</a>
-        }
+    }
-        <a class="nav-link @ViewData.IsActivePage(WalletsNavPages.Receive)" asp-action="WalletReceive" asp-route-walletId="@this.Context.GetRouteValue("walletId")" id="WalletReceive">Receive</a>
+    <a class="nav-link @ViewData.IsActivePage(WalletsNavPages.Receive)" asp-action="WalletReceive" asp-route-walletId="@this.Context.GetRouteValue("walletId")" id="WalletReceive">Receive</a>
-        <a class="nav-link @ViewData.IsActivePage(WalletsNavPages.Rescan)" asp-action="WalletRescan" asp-route-walletId="@this.Context.GetRouteValue("walletId")" id="WalletRescan">Rescan</a>
+    <a class="nav-link @ViewData.IsActivePage(WalletsNavPages.Rescan)" asp-action="WalletRescan" asp-route-walletId="@this.Context.GetRouteValue("walletId")" id="WalletRescan">Rescan</a>
-        <a class="nav-link @ViewData.IsActivePage(WalletsNavPages.PullPayments)" asp-action="PullPayments" asp-route-walletId="@this.Context.GetRouteValue("walletId")" id="WalletPullPayments">Pull payments</a>
+    <a class="nav-link @ViewData.IsActivePage(WalletsNavPages.PullPayments)" asp-action="PullPayments" asp-route-walletId="@this.Context.GetRouteValue("walletId")" id="WalletPullPayments">Pull payments</a>
-        <a class="nav-link @ViewData.IsActivePage(WalletsNavPages.Payouts)" asp-action="Payouts" asp-route-walletId="@this.Context.GetRouteValue("walletId")" id="WalletPayouts">Payouts</a>
+    <a class="nav-link @ViewData.IsActivePage(WalletsNavPages.Payouts)" asp-action="Payouts" asp-route-walletId="@this.Context.GetRouteValue("walletId")" id="WalletPayouts">Payouts</a>
-        @if (!network.ReadonlyWallet)
+    @if (!network.ReadonlyWallet)
-        {
+    {
-            <a class="nav-link @ViewData.IsActivePage(WalletsNavPages.PSBT)" asp-action="WalletPSBT" asp-route-walletId="@this.Context.GetRouteValue("walletId")">PSBT</a>
+        <a class="nav-link @ViewData.IsActivePage(WalletsNavPages.PSBT)" asp-action="WalletPSBT" asp-route-walletId="@this.Context.GetRouteValue("walletId")">PSBT</a>
-            <a class="nav-link @ViewData.IsActivePage(WalletsNavPages.Settings)" asp-action="WalletSettings" asp-route-walletId="@this.Context.GetRouteValue("walletId")" id="WalletSettings">Settings</a>
+        <a class="nav-link @ViewData.IsActivePage(WalletsNavPages.Settings)" asp-action="WalletSettings" asp-route-walletId="@this.Context.GetRouteValue("walletId")" id="WalletSettings">Settings</a>
-        }
+    }
-    </div>
+    <vc:ui-extension-point location="wallet-nav" />
+</div>

btcpayserver.sln

@@ -30,7 +30,11 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "BTCPayServer.Client", "BTCP
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "BTCPayServer.Abstractions", "BTCPayServer.Abstractions\BTCPayServer.Abstractions.csproj", "{A0D50BB6-FE2C-4671-8693-F7582B66178F}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "BTCPayServer.Test", "BTCPayServer.Test\BTCPayServer.Test.csproj", "{545AFC8E-7BC2-43D9-84CA-F9468F4FF295}"
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "BTCPayServer.Plugins.Test", "BTCPayServer.Plugins.Test\BTCPayServer.Plugins.Test.csproj", "{545AFC8E-7BC2-43D9-84CA-F9468F4FF295}"
+EndProject
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Plugins", "Plugins", "{1FC7F660-ADF1-4D55-B61A-85C6AB083C33}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "BTCPayServer.PluginPacker", "BTCPayServer.PluginPacker\BTCPayServer.PluginPacker.csproj", "{7DC94B25-1CFC-4170-AA41-7BA983E4C0B8}"
 EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
@@ -240,6 +244,30 @@ Global
 		{545AFC8E-7BC2-43D9-84CA-F9468F4FF295}.Release|x64.Build.0 = Release|Any CPU
 		{545AFC8E-7BC2-43D9-84CA-F9468F4FF295}.Release|x86.ActiveCfg = Release|Any CPU
 		{545AFC8E-7BC2-43D9-84CA-F9468F4FF295}.Release|x86.Build.0 = Release|Any CPU
+		{7DC94B25-1CFC-4170-AA41-7BA983E4C0B8}.Altcoins-Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{7DC94B25-1CFC-4170-AA41-7BA983E4C0B8}.Altcoins-Debug|Any CPU.Build.0 = Debug|Any CPU
+		{7DC94B25-1CFC-4170-AA41-7BA983E4C0B8}.Altcoins-Debug|x64.ActiveCfg = Debug|Any CPU
+		{7DC94B25-1CFC-4170-AA41-7BA983E4C0B8}.Altcoins-Debug|x64.Build.0 = Debug|Any CPU
+		{7DC94B25-1CFC-4170-AA41-7BA983E4C0B8}.Altcoins-Debug|x86.ActiveCfg = Debug|Any CPU
+		{7DC94B25-1CFC-4170-AA41-7BA983E4C0B8}.Altcoins-Debug|x86.Build.0 = Debug|Any CPU
+		{7DC94B25-1CFC-4170-AA41-7BA983E4C0B8}.Altcoins-Release|Any CPU.ActiveCfg = Debug|Any CPU
+		{7DC94B25-1CFC-4170-AA41-7BA983E4C0B8}.Altcoins-Release|Any CPU.Build.0 = Debug|Any CPU
+		{7DC94B25-1CFC-4170-AA41-7BA983E4C0B8}.Altcoins-Release|x64.ActiveCfg = Debug|Any CPU
+		{7DC94B25-1CFC-4170-AA41-7BA983E4C0B8}.Altcoins-Release|x64.Build.0 = Debug|Any CPU
+		{7DC94B25-1CFC-4170-AA41-7BA983E4C0B8}.Altcoins-Release|x86.ActiveCfg = Debug|Any CPU
+		{7DC94B25-1CFC-4170-AA41-7BA983E4C0B8}.Altcoins-Release|x86.Build.0 = Debug|Any CPU
+		{7DC94B25-1CFC-4170-AA41-7BA983E4C0B8}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{7DC94B25-1CFC-4170-AA41-7BA983E4C0B8}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{7DC94B25-1CFC-4170-AA41-7BA983E4C0B8}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{7DC94B25-1CFC-4170-AA41-7BA983E4C0B8}.Debug|x64.Build.0 = Debug|Any CPU
+		{7DC94B25-1CFC-4170-AA41-7BA983E4C0B8}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{7DC94B25-1CFC-4170-AA41-7BA983E4C0B8}.Debug|x86.Build.0 = Debug|Any CPU
+		{7DC94B25-1CFC-4170-AA41-7BA983E4C0B8}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{7DC94B25-1CFC-4170-AA41-7BA983E4C0B8}.Release|Any CPU.Build.0 = Release|Any CPU
+		{7DC94B25-1CFC-4170-AA41-7BA983E4C0B8}.Release|x64.ActiveCfg = Release|Any CPU
+		{7DC94B25-1CFC-4170-AA41-7BA983E4C0B8}.Release|x64.Build.0 = Release|Any CPU
+		{7DC94B25-1CFC-4170-AA41-7BA983E4C0B8}.Release|x86.ActiveCfg = Release|Any CPU
+		{7DC94B25-1CFC-4170-AA41-7BA983E4C0B8}.Release|x86.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
@@ -247,4 +275,8 @@ Global
 	GlobalSection(ExtensibilityGlobals) = postSolution
 		SolutionGuid = {203A3162-BE45-4721-937D-6804E0E1AFF8}
 	EndGlobalSection
+	GlobalSection(NestedProjects) = preSolution
+		{545AFC8E-7BC2-43D9-84CA-F9468F4FF295} = {1FC7F660-ADF1-4D55-B61A-85C6AB083C33}
+		{7DC94B25-1CFC-4170-AA41-7BA983E4C0B8} = {1FC7F660-ADF1-4D55-B61A-85C6AB083C33}
+	EndGlobalSection
 EndGlobal