Merge branch 'km/db-signing-keys' into km/signing-api-changes

.github/workflows/build.yml

@@ -12,6 +12,9 @@ on:
   workflow_call:
     inputs: {}
   
+permissions:
+  contents: read
+
 env:
   _AZ_REGISTRY: "bitwardenprod.azurecr.io"
   _GITHUB_PR_REPO_NAME: ${{ github.event.pull_request.head.repo.full_name }}
@@ -237,18 +240,10 @@ jobs:
           fi
           echo "tags=$TAGS" >> $GITHUB_OUTPUT
 
-      - name: Generate image full name
-        id: cache-name
-        env:
-          PROJECT_NAME: ${{ steps.setup.outputs.project_name }}
-        run: echo "name=${_AZ_REGISTRY}/${PROJECT_NAME}:buildcache" >> $GITHUB_OUTPUT
-
       - name: Build Docker image
         id: build-artifacts
         uses: docker/build-push-action@67a2d409c0a876cbe6b11854e3e25193efe4e62d # v6.12.0
         with:
-          cache-from: type=registry,ref=${{ steps.cache-name.outputs.name }}
-          cache-to: type=registry,ref=${{ steps.cache-name.outputs.name}},mode=max
           context: .
           file: ${{ matrix.base_path }}/${{ matrix.project_name }}/Dockerfile
           platforms: |
@@ -603,8 +598,9 @@ jobs:
     uses: bitwarden/gh-actions/.github/workflows/_ephemeral_environment_manager.yml@main
     with:
       project: server
-      pull_request_number: ${{ github.event.number }}
+      pull_request_number: ${{ github.event.number || 0 }}
     secrets: inherit
+    permissions: read-all
 
   check-failures:
     name: Check for failures

dev/docker-compose.yml

@@ -99,7 +99,7 @@ services:
       - idp
 
   rabbitmq:
-    image: rabbitmq:management
+    image: rabbitmq:4.1.0-management
     container_name: rabbitmq
     ports:
       - "5672:5672"
@@ -108,7 +108,7 @@ services:
       RABBITMQ_DEFAULT_USER: ${RABBITMQ_DEFAULT_USER}
       RABBITMQ_DEFAULT_PASS: ${RABBITMQ_DEFAULT_PASS}
     volumes:
-      - rabbitmq_data:/var/lib/rabbitmq_data
+      - rabbitmq_data:/var/lib/rabbitmq
     profiles:
       - rabbitmq
 

dev/setup_azurite.ps1

@@ -11,7 +11,7 @@ $corsRules = (@{
         AllowedMethods  = @("Get", "PUT");
     });
 $containers = "attachments", "sendfiles", "misc";
-$queues = "event", "notifications", "reference-events", "mail";
+$queues = "event", "notifications", "mail";
 $tables = "event", "metadata", "installationdevice";
 # End configuration
 

global.json

@@ -5,6 +5,6 @@
   },
   "msbuild-sdks": {
     "Microsoft.Build.Traversal": "4.1.0",
-    "Microsoft.Build.Sql": "0.1.9-preview"
+    "Microsoft.Build.Sql": "1.0.0"
   }
 }

src/Api/Billing/Controllers/ProviderBillingController.cs

@@ -81,13 +81,6 @@ public class ProviderBillingController(
         [FromRoute] Guid providerId,
         [FromBody] UpdatePaymentMethodRequestBody requestBody)
     {
-        var allowProviderPaymentMethod = featureService.IsEnabled(FeatureFlagKeys.PM18794_ProviderPaymentMethod);
-
-        if (!allowProviderPaymentMethod)
-        {
-            return TypedResults.NotFound();
-        }
-
         var (provider, result) = await TryGetBillableProviderForAdminOperation(providerId);
 
         if (provider == null)
@@ -111,13 +104,6 @@ public class ProviderBillingController(
         [FromRoute] Guid providerId,
         [FromBody] VerifyBankAccountRequestBody requestBody)
     {
-        var allowProviderPaymentMethod = featureService.IsEnabled(FeatureFlagKeys.PM18794_ProviderPaymentMethod);
-
-        if (!allowProviderPaymentMethod)
-        {
-            return TypedResults.NotFound();
-        }
-
         var (provider, result) = await TryGetBillableProviderForAdminOperation(providerId);
 
         if (provider == null)

src/Api/Vault/Controllers/CiphersController.cs

@@ -1064,7 +1064,7 @@ public class CiphersController : Controller
 
     [HttpPut("share")]
     [HttpPost("share")]
-    public async Task<CipherMiniResponseModel[]> PutShareMany([FromBody] CipherBulkShareRequestModel model)
+    public async Task<ListResponseModel<CipherMiniResponseModel>> PutShareMany([FromBody] CipherBulkShareRequestModel model)
     {
         var organizationId = new Guid(model.Ciphers.First().OrganizationId);
         if (!await _currentContext.OrganizationUser(organizationId))
@@ -1086,7 +1086,7 @@ public class CiphersController : Controller
             }
         }
 
-        var shareCiphers = new List<(Cipher, DateTime?)>();
+        var shareCiphers = new List<(CipherDetails, DateTime?)>();
         foreach (var cipher in model.Ciphers)
         {
             if (!ciphersDict.TryGetValue(cipher.Id.Value, out var existingCipher))
@@ -1096,7 +1096,7 @@ public class CiphersController : Controller
 
             ValidateClientVersionForFido2CredentialSupport(existingCipher);
 
-            shareCiphers.Add(((Cipher)existingCipher, cipher.LastKnownRevisionDate));
+            shareCiphers.Add((cipher.ToCipherDetails(existingCipher), cipher.LastKnownRevisionDate));
         }
 
         var updated = await _cipherService.ShareManyAsync(
@@ -1106,7 +1106,8 @@ public class CiphersController : Controller
             userId
         );
 
-        return updated.Select(c => new CipherMiniResponseModel(c, _globalSettings, false)).ToArray();
+        var response = updated.Select(c => new CipherMiniResponseModel(c, _globalSettings, c.OrganizationUseTotp));
+        return new ListResponseModel<CipherMiniResponseModel>(response);
     }
 
     [HttpPost("purge")]

src/Api/Vault/Controllers/SecurityTaskController.cs

@@ -1,9 +1,7 @@
 using Bit.Api.Models.Response;
 using Bit.Api.Vault.Models.Request;
 using Bit.Api.Vault.Models.Response;
-using Bit.Core;
 using Bit.Core.Services;
-using Bit.Core.Utilities;
 using Bit.Core.Vault.Commands.Interfaces;
 using Bit.Core.Vault.Entities;
 using Bit.Core.Vault.Enums;
@@ -15,7 +13,6 @@ namespace Bit.Api.Vault.Controllers;
 
 [Route("tasks")]
 [Authorize("Application")]
-[RequireFeature(FeatureFlagKeys.SecurityTasks)]
 public class SecurityTaskController : Controller
 {
     private readonly IUserService _userService;

src/Core/AdminConsole/Enums/PolicyType.cs

@@ -17,6 +17,7 @@ public enum PolicyType : byte
     AutomaticAppLogIn = 12,
     FreeFamiliesSponsorshipPolicy = 13,
     RemoveUnlockWithPin = 14,
+    RestrictedItemTypesPolicy = 15,
 }
 
 public static class PolicyTypeExtensions
@@ -43,7 +44,8 @@ public static class PolicyTypeExtensions
             PolicyType.ActivateAutofill => "Active auto-fill",
             PolicyType.AutomaticAppLogIn => "Automatically log in users for allowed applications",
             PolicyType.FreeFamiliesSponsorshipPolicy => "Remove Free Bitwarden Families sponsorship",
-            PolicyType.RemoveUnlockWithPin => "Remove unlock with PIN"
+            PolicyType.RemoveUnlockWithPin => "Remove unlock with PIN",
+            PolicyType.RestrictedItemTypesPolicy => "Restricted item types",
         };
     }
 }

src/Core/AdminConsole/Models/Data/Integrations/IIntegrationMessage.cs

@@ -1,12 +1,15 @@
-using Bit.Core.Enums;
+#nullable enable
+
+using Bit.Core.Enums;
 
 namespace Bit.Core.AdminConsole.Models.Data.Integrations;
 
 public interface IIntegrationMessage
 {
     IntegrationType IntegrationType { get; }
-    int RetryCount { get; set; }
-    DateTime? DelayUntilDate { get; set; }
+    string MessageId { get; set; }
+    int RetryCount { get; }
+    DateTime? DelayUntilDate { get; }
     void ApplyRetry(DateTime? handlerDelayUntilDate);
     string ToJson();
 }

src/Core/AdminConsole/Models/Data/Integrations/IntegrationHandlerResult.cs

@@ -1,4 +1,6 @@
-namespace Bit.Core.AdminConsole.Models.Data.Integrations;
+#nullable enable
+
+namespace Bit.Core.AdminConsole.Models.Data.Integrations;
 
 public class IntegrationHandlerResult
 {

src/Core/AdminConsole/Models/Data/Integrations/IntegrationMessage.cs

@@ -1,13 +1,15 @@
-using System.Text.Json;
+#nullable enable
+
+using System.Text.Json;
 using Bit.Core.Enums;
 
 namespace Bit.Core.AdminConsole.Models.Data.Integrations;
 
-public class IntegrationMessage<T> : IIntegrationMessage
+public class IntegrationMessage : IIntegrationMessage
 {
     public IntegrationType IntegrationType { get; set; }
-    public T Configuration { get; set; }
-    public string RenderedTemplate { get; set; }
+    public required string MessageId { get; set; }
+    public required string RenderedTemplate { get; set; }
     public int RetryCount { get; set; } = 0;
     public DateTime? DelayUntilDate { get; set; }
 
@@ -22,12 +24,22 @@ public class IntegrationMessage<T> : IIntegrationMessage
         DelayUntilDate = baseTime.AddSeconds(backoffSeconds + jitterSeconds);
     }
 
-    public string ToJson()
+    public virtual string ToJson()
+    {
+        return JsonSerializer.Serialize(this);
+    }
+}
+
+public class IntegrationMessage<T> : IntegrationMessage
+{
+    public required T Configuration { get; set; }
+
+    public override string ToJson()
     {
         return JsonSerializer.Serialize(this);
     }
 
-    public static IntegrationMessage<T> FromJson(string json)
+    public static IntegrationMessage<T>? FromJson(string json)
     {
         return JsonSerializer.Deserialize<IntegrationMessage<T>>(json);
     }

src/Core/AdminConsole/Models/Data/Integrations/SlackIntegration.cs

@@ -1,3 +1,5 @@
-namespace Bit.Core.AdminConsole.Models.Data.Integrations;
+#nullable enable
+
+namespace Bit.Core.AdminConsole.Models.Data.Integrations;
 
 public record SlackIntegration(string token);

src/Core/AdminConsole/Models/Data/Integrations/SlackIntegrationConfiguration.cs

@@ -1,3 +1,5 @@
-namespace Bit.Core.AdminConsole.Models.Data.Integrations;
+#nullable enable
+
+namespace Bit.Core.AdminConsole.Models.Data.Integrations;
 
 public record SlackIntegrationConfiguration(string channelId);

src/Core/AdminConsole/Models/Data/Integrations/SlackIntegrationConfigurationDetails.cs

@@ -1,3 +1,5 @@
-namespace Bit.Core.AdminConsole.Models.Data.Integrations;
+#nullable enable
+
+namespace Bit.Core.AdminConsole.Models.Data.Integrations;
 
 public record SlackIntegrationConfigurationDetails(string channelId, string token);

src/Core/AdminConsole/Models/Data/Integrations/WebhookIntegrationConfiguration.cs

@@ -1,3 +1,5 @@
-namespace Bit.Core.AdminConsole.Models.Data.Integrations;
+#nullable enable
+
+namespace Bit.Core.AdminConsole.Models.Data.Integrations;
 
 public record WebhookIntegrationConfiguration(string url);

src/Core/AdminConsole/Models/Data/Integrations/WebhookIntegrationConfigurationDetails.cs

@@ -1,3 +1,5 @@
-namespace Bit.Core.AdminConsole.Models.Data.Integrations;
+#nullable enable
+
+namespace Bit.Core.AdminConsole.Models.Data.Integrations;
 
 public record WebhookIntegrationConfigurationDetails(string url);

src/Core/AdminConsole/Models/Slack/SlackApiResponse.cs

@@ -1,4 +1,5 @@
-
+#nullable enable
+
 using System.Text.Json.Serialization;
 
 namespace Bit.Core.Models.Slack;

src/Core/AdminConsole/Services/EventLoggingListenerService.cs

@@ -1,13 +1,87 @@
-using Microsoft.Extensions.Hosting;
+#nullable enable
+
+using System.Text.Json;
+using Bit.Core.Models.Data;
+using Microsoft.Extensions.Hosting;
+using Microsoft.Extensions.Logging;
 
 namespace Bit.Core.Services;
 
 public abstract class EventLoggingListenerService : BackgroundService
 {
     protected readonly IEventMessageHandler _handler;
+    protected ILogger<EventLoggingListenerService> _logger;
 
-    protected EventLoggingListenerService(IEventMessageHandler handler)
+    protected EventLoggingListenerService(IEventMessageHandler handler, ILogger<EventLoggingListenerService> logger)
     {
-        _handler = handler ?? throw new ArgumentNullException(nameof(handler));
+        _handler = handler;
+        _logger = logger;
+    }
+
+    internal async Task ProcessReceivedMessageAsync(string body, string? messageId)
+    {
+        try
+        {
+            using var jsonDocument = JsonDocument.Parse(body);
+            var root = jsonDocument.RootElement;
+
+            if (root.ValueKind == JsonValueKind.Array)
+            {
+                var eventMessages = root.Deserialize<IEnumerable<EventMessage>>();
+                await _handler.HandleManyEventsAsync(eventMessages);
+            }
+            else if (root.ValueKind == JsonValueKind.Object)
+            {
+                var eventMessage = root.Deserialize<EventMessage>();
+                await _handler.HandleEventAsync(eventMessage);
+            }
+            else
+            {
+                if (!string.IsNullOrEmpty(messageId))
+                {
+                    _logger.LogError("An error occurred while processing message: {MessageId} - Invalid JSON", messageId);
+                }
+                else
+                {
+                    _logger.LogError("An Invalid JSON error occurred while processing a message with an empty message id");
+                }
+            }
+        }
+        catch (JsonException exception)
+        {
+            if (!string.IsNullOrEmpty(messageId))
+            {
+                _logger.LogError(
+                    exception,
+                    "An error occurred while processing message: {MessageId} - Invalid JSON",
+                    messageId
+                );
+            }
+            else
+            {
+                _logger.LogError(
+                    exception,
+                    "An Invalid JSON error occurred while processing a message with an empty message id"
+                );
+            }
+        }
+        catch (Exception exception)
+        {
+            if (!string.IsNullOrEmpty(messageId))
+            {
+                _logger.LogError(
+                    exception,
+                    "An error occurred while processing message: {MessageId}",
+                    messageId
+                );
+            }
+            else
+            {
+                _logger.LogError(
+                    exception,
+                    "An error occurred while processing a message with an empty message id"
+                );
+            }
+        }
     }
 }

src/Core/AdminConsole/Services/IAzureServiceBusService.cs

@@ -0,0 +1,10 @@
+using Azure.Messaging.ServiceBus;
+using Bit.Core.AdminConsole.Models.Data.Integrations;
+
+namespace Bit.Core.Services;
+
+public interface IAzureServiceBusService : IEventIntegrationPublisher, IAsyncDisposable
+{
+    ServiceBusProcessor CreateProcessor(string topicName, string subscriptionName, ServiceBusProcessorOptions options);
+    Task PublishToRetryAsync(IIntegrationMessage message);
+}

src/Core/AdminConsole/Services/IEventIntegrationPublisher.cs

@@ -2,7 +2,8 @@
 
 namespace Bit.Core.Services;
 
-public interface IIntegrationPublisher
+public interface IEventIntegrationPublisher : IAsyncDisposable
 {
     Task PublishAsync(IIntegrationMessage message);
+    Task PublishEventAsync(string body);
 }

src/Core/AdminConsole/Services/IRabbitMqService.cs

@@ -0,0 +1,19 @@
+using Bit.Core.AdminConsole.Models.Data.Integrations;
+using RabbitMQ.Client;
+using RabbitMQ.Client.Events;
+
+namespace Bit.Core.Services;
+
+public interface IRabbitMqService : IEventIntegrationPublisher
+{
+    Task<IChannel> CreateChannelAsync(CancellationToken cancellationToken = default);
+    Task CreateEventQueueAsync(string queueName, CancellationToken cancellationToken = default);
+    Task CreateIntegrationQueuesAsync(
+        string queueName,
+        string retryQueueName,
+        string routingKey,
+        CancellationToken cancellationToken = default);
+    Task PublishToRetryAsync(IChannel channel, IIntegrationMessage message, CancellationToken cancellationToken);
+    Task PublishToDeadLetterAsync(IChannel channel, IIntegrationMessage message, CancellationToken cancellationToken);
+    Task RepublishToRetryQueueAsync(IChannel channel, BasicDeliverEventArgs eventArgs);
+}

src/Core/AdminConsole/Services/Implementations/AzureServiceBusEventListenerService.cs

@@ -1,7 +1,7 @@
-using System.Text;
-using System.Text.Json;
+#nullable enable
+
+using System.Text;
 using Azure.Messaging.ServiceBus;
-using Bit.Core.Models.Data;
 using Bit.Core.Settings;
 using Microsoft.Extensions.Logging;
 
@@ -9,67 +9,47 @@ namespace Bit.Core.Services;
 
 public class AzureServiceBusEventListenerService : EventLoggingListenerService
 {
-    private readonly ILogger<AzureServiceBusEventListenerService> _logger;
-    private readonly ServiceBusClient _client;
     private readonly ServiceBusProcessor _processor;
 
     public AzureServiceBusEventListenerService(
         IEventMessageHandler handler,
-        ILogger<AzureServiceBusEventListenerService> logger,
+        IAzureServiceBusService serviceBusService,
+        string subscriptionName,
         GlobalSettings globalSettings,
-        string subscriptionName) : base(handler)
+        ILogger<AzureServiceBusEventListenerService> logger) : base(handler, logger)
     {
-        _client = new ServiceBusClient(globalSettings.EventLogging.AzureServiceBus.ConnectionString);
-        _processor = _client.CreateProcessor(globalSettings.EventLogging.AzureServiceBus.EventTopicName, subscriptionName, new ServiceBusProcessorOptions());
+        _processor = serviceBusService.CreateProcessor(
+            globalSettings.EventLogging.AzureServiceBus.EventTopicName,
+            subscriptionName,
+            new ServiceBusProcessorOptions());
         _logger = logger;
     }
 
     protected override async Task ExecuteAsync(CancellationToken cancellationToken)
     {
-        _processor.ProcessMessageAsync += async args =>
-        {
-            try
-            {
-                using var jsonDocument = JsonDocument.Parse(Encoding.UTF8.GetString(args.Message.Body));
-                var root = jsonDocument.RootElement;
-
-                if (root.ValueKind == JsonValueKind.Array)
-                {
-                    var eventMessages = root.Deserialize<IEnumerable<EventMessage>>();
-                    await _handler.HandleManyEventsAsync(eventMessages);
-                }
-                else if (root.ValueKind == JsonValueKind.Object)
-                {
-                    var eventMessage = root.Deserialize<EventMessage>();
-                    await _handler.HandleEventAsync(eventMessage);
-
-                }
-                await args.CompleteMessageAsync(args.Message);
-            }
-            catch (Exception exception)
-            {
-                _logger.LogError(
-                    exception,
-                    "An error occured while processing message: {MessageId}",
-                    args.Message.MessageId
-                );
-            }
-        };
-
-        _processor.ProcessErrorAsync += args =>
-        {
-            _logger.LogError(
-                args.Exception,
-                "An error occurred. Entity Path: {EntityPath}, Error Source: {ErrorSource}",
-                args.EntityPath,
-                args.ErrorSource
-            );
-            return Task.CompletedTask;
-        };
+        _processor.ProcessMessageAsync += ProcessReceivedMessageAsync;
+        _processor.ProcessErrorAsync += ProcessErrorAsync;
 
         await _processor.StartProcessingAsync(cancellationToken);
     }
 
+    internal Task ProcessErrorAsync(ProcessErrorEventArgs args)
+    {
+        _logger.LogError(
+            args.Exception,
+            "An error occurred. Entity Path: {EntityPath}, Error Source: {ErrorSource}",
+            args.EntityPath,
+            args.ErrorSource
+        );
+        return Task.CompletedTask;
+    }
+
+    private async Task ProcessReceivedMessageAsync(ProcessMessageEventArgs args)
+    {
+        await ProcessReceivedMessageAsync(Encoding.UTF8.GetString(args.Message.Body), args.Message.MessageId);
+        await args.CompleteMessageAsync(args.Message);
+    }
+
     public override async Task StopAsync(CancellationToken cancellationToken)
     {
         await _processor.StopProcessingAsync(cancellationToken);
@@ -79,7 +59,6 @@ public class AzureServiceBusEventListenerService : EventLoggingListenerService
     public override void Dispose()
     {
         _processor.DisposeAsync().GetAwaiter().GetResult();
-        _client.DisposeAsync().GetAwaiter().GetResult();
         base.Dispose();
     }
 }

src/Core/AdminConsole/Services/Implementations/AzureServiceBusEventWriteService.cs

@@ -1,45 +0,0 @@
-using System.Text.Json;
-using Azure.Messaging.ServiceBus;
-using Bit.Core.Models.Data;
-using Bit.Core.Services;
-using Bit.Core.Settings;
-
-namespace Bit.Core.AdminConsole.Services.Implementations;
-
-public class AzureServiceBusEventWriteService : IEventWriteService, IAsyncDisposable
-{
-    private readonly ServiceBusClient _client;
-    private readonly ServiceBusSender _sender;
-
-    public AzureServiceBusEventWriteService(GlobalSettings globalSettings)
-    {
-        _client = new ServiceBusClient(globalSettings.EventLogging.AzureServiceBus.ConnectionString);
-        _sender = _client.CreateSender(globalSettings.EventLogging.AzureServiceBus.EventTopicName);
-    }
-
-    public async Task CreateAsync(IEvent e)
-    {
-        var message = new ServiceBusMessage(JsonSerializer.SerializeToUtf8Bytes(e))
-        {
-            ContentType = "application/json"
-        };
-
-        await _sender.SendMessageAsync(message);
-    }
-
-    public async Task CreateManyAsync(IEnumerable<IEvent> events)
-    {
-        var message = new ServiceBusMessage(JsonSerializer.SerializeToUtf8Bytes(events))
-        {
-            ContentType = "application/json"
-        };
-
-        await _sender.SendMessageAsync(message);
-    }
-
-    public async ValueTask DisposeAsync()
-    {
-        await _sender.DisposeAsync();
-        await _client.DisposeAsync();
-    }
-}

src/Core/AdminConsole/Services/Implementations/AzureServiceBusIntegrationListenerService.cs

@@ -1,7 +1,6 @@
 #nullable enable
 
 using Azure.Messaging.ServiceBus;
-using Bit.Core.Settings;
 using Microsoft.Extensions.Hosting;
 using Microsoft.Extensions.Logging;
 
@@ -10,39 +9,30 @@ namespace Bit.Core.Services;
 public class AzureServiceBusIntegrationListenerService : BackgroundService
 {
     private readonly int _maxRetries;
-    private readonly string _subscriptionName;
-    private readonly string _topicName;
+    private readonly IAzureServiceBusService _serviceBusService;
     private readonly IIntegrationHandler _handler;
-    private readonly ServiceBusClient _client;
     private readonly ServiceBusProcessor _processor;
-    private readonly ServiceBusSender _sender;
     private readonly ILogger<AzureServiceBusIntegrationListenerService> _logger;
 
-    public AzureServiceBusIntegrationListenerService(
-        IIntegrationHandler handler,
+    public AzureServiceBusIntegrationListenerService(IIntegrationHandler handler,
+        string topicName,
         string subscriptionName,
-        GlobalSettings globalSettings,
+        int maxRetries,
+        IAzureServiceBusService serviceBusService,
         ILogger<AzureServiceBusIntegrationListenerService> logger)
     {
         _handler = handler;
         _logger = logger;
-        _maxRetries = globalSettings.EventLogging.AzureServiceBus.MaxRetries;
-        _topicName = globalSettings.EventLogging.AzureServiceBus.IntegrationTopicName;
-        _subscriptionName = subscriptionName;
+        _maxRetries = maxRetries;
+        _serviceBusService = serviceBusService;
 
-        _client = new ServiceBusClient(globalSettings.EventLogging.AzureServiceBus.ConnectionString);
-        _processor = _client.CreateProcessor(_topicName, _subscriptionName, new ServiceBusProcessorOptions());
-        _sender = _client.CreateSender(_topicName);
+        _processor = _serviceBusService.CreateProcessor(topicName, subscriptionName, new ServiceBusProcessorOptions());
     }
 
     protected override async Task ExecuteAsync(CancellationToken cancellationToken)
     {
         _processor.ProcessMessageAsync += HandleMessageAsync;
-        _processor.ProcessErrorAsync += args =>
-        {
-            _logger.LogError(args.Exception, "Azure Service Bus error");
-            return Task.CompletedTask;
-        };
+        _processor.ProcessErrorAsync += ProcessErrorAsync;
 
         await _processor.StartProcessingAsync(cancellationToken);
     }
@@ -51,51 +41,67 @@ public class AzureServiceBusIntegrationListenerService : BackgroundService
     {
         await _processor.StopProcessingAsync(cancellationToken);
         await _processor.DisposeAsync();
-        await _sender.DisposeAsync();
-        await _client.DisposeAsync();
         await base.StopAsync(cancellationToken);
     }
 
-    private async Task HandleMessageAsync(ProcessMessageEventArgs args)
+    internal Task ProcessErrorAsync(ProcessErrorEventArgs args)
     {
-        var json = args.Message.Body.ToString();
+        _logger.LogError(
+            args.Exception,
+            "An error occurred. Entity Path: {EntityPath}, Error Source: {ErrorSource}",
+            args.EntityPath,
+            args.ErrorSource
+        );
+        return Task.CompletedTask;
+    }
 
+    internal async Task<bool> HandleMessageAsync(string body)
+    {
         try
         {
-            var result = await _handler.HandleAsync(json);
+            var result = await _handler.HandleAsync(body);
             var message = result.Message;
 
             if (result.Success)
             {
-                await args.CompleteMessageAsync(args.Message);
-                return;
+                // Successful integration. Return true to indicate the message has been handled
+                return true;
             }
 
             message.ApplyRetry(result.DelayUntilDate);
 
             if (result.Retryable && message.RetryCount < _maxRetries)
             {
-                var scheduledTime = (DateTime)message.DelayUntilDate!;
-                var retryMsg = new ServiceBusMessage(message.ToJson())
-                {
-                    Subject = args.Message.Subject,
-                    ScheduledEnqueueTime = scheduledTime
-                };
-
-                await _sender.SendMessageAsync(retryMsg);
+                // Publish message to the retry queue. It will be re-published for retry after a delay
+                // Return true to indicate the message has been handled
+                await _serviceBusService.PublishToRetryAsync(message);
+                return true;
             }
             else
             {
-                await args.DeadLetterMessageAsync(args.Message, "Retry limit exceeded or non-retryable");
-                return;
+                // Non-recoverable failure or exceeded the max number of retries
+                // Return false to indicate this message should be dead-lettered
+                return false;
             }
-
-            await args.CompleteMessageAsync(args.Message);
         }
         catch (Exception ex)
         {
+            // Unknown exception - log error, return true so the message will be acknowledged and not resent
             _logger.LogError(ex, "Unhandled error processing ASB message");
+            return true;
+        }
+    }
+
+    private async Task HandleMessageAsync(ProcessMessageEventArgs args)
+    {
+        var json = args.Message.Body.ToString();
+        if (await HandleMessageAsync(json))
+        {
             await args.CompleteMessageAsync(args.Message);
         }
+        else
+        {
+            await args.DeadLetterMessageAsync(args.Message, "Retry limit exceeded or non-retryable");
+        }
     }
 }

src/Core/AdminConsole/Services/Implementations/AzureServiceBusIntegrationPublisher.cs

@@ -1,36 +0,0 @@
-using Azure.Messaging.ServiceBus;
-using Bit.Core.AdminConsole.Models.Data.Integrations;
-using Bit.Core.Enums;
-using Bit.Core.Settings;
-
-namespace Bit.Core.Services;
-
-public class AzureServiceBusIntegrationPublisher : IIntegrationPublisher, IAsyncDisposable
-{
-    private readonly ServiceBusClient _client;
-    private readonly ServiceBusSender _sender;
-
-    public AzureServiceBusIntegrationPublisher(GlobalSettings globalSettings)
-    {
-        _client = new ServiceBusClient(globalSettings.EventLogging.AzureServiceBus.ConnectionString);
-        _sender = _client.CreateSender(globalSettings.EventLogging.AzureServiceBus.IntegrationTopicName);
-    }
-
-    public async Task PublishAsync(IIntegrationMessage message)
-    {
-        var json = message.ToJson();
-
-        var serviceBusMessage = new ServiceBusMessage(json)
-        {
-            Subject = message.IntegrationType.ToRoutingKey(),
-        };
-
-        await _sender.SendMessageAsync(serviceBusMessage);
-    }
-
-    public async ValueTask DisposeAsync()
-    {
-        await _sender.DisposeAsync();
-        await _client.DisposeAsync();
-    }
-}

src/Core/AdminConsole/Services/Implementations/AzureServiceBusService.cs

@@ -0,0 +1,70 @@
+using Azure.Messaging.ServiceBus;
+using Bit.Core.AdminConsole.Models.Data.Integrations;
+using Bit.Core.Enums;
+using Bit.Core.Settings;
+
+namespace Bit.Core.Services;
+
+public class AzureServiceBusService : IAzureServiceBusService
+{
+    private readonly ServiceBusClient _client;
+    private readonly ServiceBusSender _eventSender;
+    private readonly ServiceBusSender _integrationSender;
+
+    public AzureServiceBusService(GlobalSettings globalSettings)
+    {
+        _client = new ServiceBusClient(globalSettings.EventLogging.AzureServiceBus.ConnectionString);
+        _eventSender = _client.CreateSender(globalSettings.EventLogging.AzureServiceBus.EventTopicName);
+        _integrationSender = _client.CreateSender(globalSettings.EventLogging.AzureServiceBus.IntegrationTopicName);
+    }
+
+    public ServiceBusProcessor CreateProcessor(string topicName, string subscriptionName, ServiceBusProcessorOptions options)
+    {
+        return _client.CreateProcessor(topicName, subscriptionName, options);
+    }
+
+    public async Task PublishAsync(IIntegrationMessage message)
+    {
+        var json = message.ToJson();
+
+        var serviceBusMessage = new ServiceBusMessage(json)
+        {
+            Subject = message.IntegrationType.ToRoutingKey(),
+            MessageId = message.MessageId
+        };
+
+        await _integrationSender.SendMessageAsync(serviceBusMessage);
+    }
+
+    public async Task PublishToRetryAsync(IIntegrationMessage message)
+    {
+        var json = message.ToJson();
+
+        var serviceBusMessage = new ServiceBusMessage(json)
+        {
+            Subject = message.IntegrationType.ToRoutingKey(),
+            ScheduledEnqueueTime = message.DelayUntilDate ?? DateTime.UtcNow,
+            MessageId = message.MessageId
+        };
+
+        await _integrationSender.SendMessageAsync(serviceBusMessage);
+    }
+
+    public async Task PublishEventAsync(string body)
+    {
+        var message = new ServiceBusMessage(body)
+        {
+            ContentType = "application/json",
+            MessageId = Guid.NewGuid().ToString()
+        };
+
+        await _eventSender.SendMessageAsync(message);
+    }
+
+    public async ValueTask DisposeAsync()
+    {
+        await _eventSender.DisposeAsync();
+        await _integrationSender.DisposeAsync();
+        await _client.DisposeAsync();
+    }
+}

src/Core/AdminConsole/Services/Implementations/AzureTableStorageEventHandler.cs

@@ -1,4 +1,6 @@
-using Bit.Core.Models.Data;
+#nullable enable
+
+using Bit.Core.Models.Data;
 using Microsoft.Extensions.DependencyInjection;
 
 namespace Bit.Core.Services;

src/Core/AdminConsole/Services/Implementations/EventIntegrationEventWriteService.cs

@@ -0,0 +1,32 @@
+#nullable enable
+
+using System.Text.Json;
+using Bit.Core.Models.Data;
+
+namespace Bit.Core.Services;
+public class EventIntegrationEventWriteService : IEventWriteService, IAsyncDisposable
+{
+    private readonly IEventIntegrationPublisher _eventIntegrationPublisher;
+
+    public EventIntegrationEventWriteService(IEventIntegrationPublisher eventIntegrationPublisher)
+    {
+        _eventIntegrationPublisher = eventIntegrationPublisher;
+    }
+
+    public async Task CreateAsync(IEvent e)
+    {
+        var body = JsonSerializer.Serialize(e);
+        await _eventIntegrationPublisher.PublishEventAsync(body: body);
+    }
+
+    public async Task CreateManyAsync(IEnumerable<IEvent> events)
+    {
+        var body = JsonSerializer.Serialize(events);
+        await _eventIntegrationPublisher.PublishEventAsync(body: body);
+    }
+
+    public async ValueTask DisposeAsync()
+    {
+        await _eventIntegrationPublisher.DisposeAsync();
+    }
+}

src/Core/AdminConsole/Services/Implementations/EventIntegrationHandler.cs

@@ -1,4 +1,6 @@
-using System.Text.Json;
+#nullable enable
+
+using System.Text.Json;
 using Bit.Core.AdminConsole.Models.Data.Integrations;
 using Bit.Core.AdminConsole.Utilities;
 using Bit.Core.Enums;
@@ -7,11 +9,9 @@ using Bit.Core.Repositories;
 
 namespace Bit.Core.Services;
 
-#nullable enable
-
 public class EventIntegrationHandler<T>(
     IntegrationType integrationType,
-    IIntegrationPublisher integrationPublisher,
+    IEventIntegrationPublisher eventIntegrationPublisher,
     IOrganizationIntegrationConfigurationRepository configurationRepository,
     IUserRepository userRepository,
     IOrganizationRepository organizationRepository)
@@ -34,6 +34,7 @@ public class EventIntegrationHandler<T>(
             var template = configuration.Template ?? string.Empty;
             var context = await BuildContextAsync(eventMessage, template);
             var renderedTemplate = IntegrationTemplateProcessor.ReplaceTokens(template, context);
+            var messageId = eventMessage.IdempotencyId ?? Guid.NewGuid();
 
             var config = configuration.MergedConfiguration.Deserialize<T>()
                          ?? throw new InvalidOperationException($"Failed to deserialize to {typeof(T).Name}");
@@ -41,13 +42,14 @@ public class EventIntegrationHandler<T>(
             var message = new IntegrationMessage<T>
             {
                 IntegrationType = integrationType,
+                MessageId = messageId.ToString(),
                 Configuration = config,
                 RenderedTemplate = renderedTemplate,
                 RetryCount = 0,
                 DelayUntilDate = null
             };
 
-            await integrationPublisher.PublishAsync(message);
+            await eventIntegrationPublisher.PublishAsync(message);
         }
     }
 

src/Core/AdminConsole/Services/Implementations/EventRepositoryHandler.cs

@@ -1,4 +1,6 @@
-using Bit.Core.Models.Data;
+#nullable enable
+
+using Bit.Core.Models.Data;
 using Microsoft.Extensions.DependencyInjection;
 
 namespace Bit.Core.Services;

src/Core/AdminConsole/Services/Implementations/EventRouteService.cs

@@ -1,4 +1,6 @@
-using Bit.Core.Models.Data;
+#nullable enable
+
+using Bit.Core.Models.Data;
 using Microsoft.Extensions.DependencyInjection;
 
 namespace Bit.Core.Services;

src/Core/AdminConsole/Services/Implementations/RabbitMqEventListenerService.cs

@@ -1,7 +1,6 @@
-using System.Text;
-using System.Text.Json;
-using Bit.Core.Models.Data;
-using Bit.Core.Settings;
+#nullable enable
+
+using System.Text;
 using Microsoft.Extensions.Logging;
 using RabbitMQ.Client;
 using RabbitMQ.Client.Events;
@@ -10,94 +9,60 @@ namespace Bit.Core.Services;
 
 public class RabbitMqEventListenerService : EventLoggingListenerService
 {
-    private IChannel _channel;
-    private IConnection _connection;
-    private readonly string _exchangeName;
-    private readonly ConnectionFactory _factory;
-    private readonly ILogger<RabbitMqEventListenerService> _logger;
+    private readonly Lazy<Task<IChannel>> _lazyChannel;
     private readonly string _queueName;
+    private readonly IRabbitMqService _rabbitMqService;
 
     public RabbitMqEventListenerService(
         IEventMessageHandler handler,
-        ILogger<RabbitMqEventListenerService> logger,
-        GlobalSettings globalSettings,
-        string queueName) : base(handler)
+        string queueName,
+        IRabbitMqService rabbitMqService,
+        ILogger<RabbitMqEventListenerService> logger) : base(handler, logger)
     {
-        _factory = new ConnectionFactory
-        {
-            HostName = globalSettings.EventLogging.RabbitMq.HostName,
-            UserName = globalSettings.EventLogging.RabbitMq.Username,
-            Password = globalSettings.EventLogging.RabbitMq.Password
-        };
-        _exchangeName = globalSettings.EventLogging.RabbitMq.EventExchangeName;
         _logger = logger;
         _queueName = queueName;
+        _rabbitMqService = rabbitMqService;
+        _lazyChannel = new Lazy<Task<IChannel>>(() => _rabbitMqService.CreateChannelAsync());
     }
 
     public override async Task StartAsync(CancellationToken cancellationToken)
     {
-        _connection = await _factory.CreateConnectionAsync(cancellationToken);
-        _channel = await _connection.CreateChannelAsync(cancellationToken: cancellationToken);
-
-        await _channel.ExchangeDeclareAsync(exchange: _exchangeName,
-                                            type: ExchangeType.Fanout,
-                                            durable: true,
-                                            cancellationToken: cancellationToken);
-        await _channel.QueueDeclareAsync(queue: _queueName,
-                                         durable: true,
-                                         exclusive: false,
-                                         autoDelete: false,
-                                         arguments: null,
-                                         cancellationToken: cancellationToken);
-        await _channel.QueueBindAsync(queue: _queueName,
-                                      exchange: _exchangeName,
-                                      routingKey: string.Empty,
-                                      cancellationToken: cancellationToken);
+        await _rabbitMqService.CreateEventQueueAsync(_queueName, cancellationToken);
         await base.StartAsync(cancellationToken);
     }
 
     protected override async Task ExecuteAsync(CancellationToken cancellationToken)
     {
-        var consumer = new AsyncEventingBasicConsumer(_channel);
-        consumer.ReceivedAsync += async (_, eventArgs) =>
-        {
-            try
-            {
-                using var jsonDocument = JsonDocument.Parse(Encoding.UTF8.GetString(eventArgs.Body.Span));
-                var root = jsonDocument.RootElement;
+        var channel = await _lazyChannel.Value;
+        var consumer = new AsyncEventingBasicConsumer(channel);
+        consumer.ReceivedAsync += async (_, eventArgs) => { await ProcessReceivedMessageAsync(eventArgs); };
 
-                if (root.ValueKind == JsonValueKind.Array)
-                {
-                    var eventMessages = root.Deserialize<IEnumerable<EventMessage>>();
-                    await _handler.HandleManyEventsAsync(eventMessages);
-                }
-                else if (root.ValueKind == JsonValueKind.Object)
-                {
-                    var eventMessage = root.Deserialize<EventMessage>();
-                    await _handler.HandleEventAsync(eventMessage);
+        await channel.BasicConsumeAsync(_queueName, autoAck: true, consumer: consumer, cancellationToken: cancellationToken);
+    }
 
-                }
-            }
-            catch (Exception ex)
-            {
-                _logger.LogError(ex, "An error occurred while processing the message");
-            }
-        };
-
-        await _channel.BasicConsumeAsync(_queueName, autoAck: true, consumer: consumer, cancellationToken: cancellationToken);
+    internal async Task ProcessReceivedMessageAsync(BasicDeliverEventArgs eventArgs)
+    {
+        await ProcessReceivedMessageAsync(
+            Encoding.UTF8.GetString(eventArgs.Body.Span),
+            eventArgs.BasicProperties.MessageId);
     }
 
     public override async Task StopAsync(CancellationToken cancellationToken)
     {
-        await _channel.CloseAsync(cancellationToken);
-        await _connection.CloseAsync(cancellationToken);
+        if (_lazyChannel.IsValueCreated)
+        {
+            var channel = await _lazyChannel.Value;
+            await channel.CloseAsync(cancellationToken);
+        }
         await base.StopAsync(cancellationToken);
     }
 
     public override void Dispose()
     {
-        _channel.Dispose();
-        _connection.Dispose();
+        if (_lazyChannel.IsValueCreated && _lazyChannel.Value.IsCompletedSuccessfully)
+        {
+            _lazyChannel.Value.Result.Dispose();
+        }
         base.Dispose();
     }
 }

src/Core/AdminConsole/Services/Implementations/RabbitMqEventWriteService.cs

@@ -1,62 +0,0 @@
-using System.Text.Json;
-using Bit.Core.Models.Data;
-using Bit.Core.Settings;
-using RabbitMQ.Client;
-
-namespace Bit.Core.Services;
-public class RabbitMqEventWriteService : IEventWriteService, IAsyncDisposable
-{
-    private readonly ConnectionFactory _factory;
-    private readonly Lazy<Task<IConnection>> _lazyConnection;
-    private readonly string _exchangeName;
-
-    public RabbitMqEventWriteService(GlobalSettings globalSettings)
-    {
-        _factory = new ConnectionFactory
-        {
-            HostName = globalSettings.EventLogging.RabbitMq.HostName,
-            UserName = globalSettings.EventLogging.RabbitMq.Username,
-            Password = globalSettings.EventLogging.RabbitMq.Password
-        };
-        _exchangeName = globalSettings.EventLogging.RabbitMq.EventExchangeName;
-
-        _lazyConnection = new Lazy<Task<IConnection>>(CreateConnectionAsync);
-    }
-
-    public async Task CreateAsync(IEvent e)
-    {
-        var connection = await _lazyConnection.Value;
-        using var channel = await connection.CreateChannelAsync();
-
-        await channel.ExchangeDeclareAsync(exchange: _exchangeName, type: ExchangeType.Fanout, durable: true);
-
-        var body = JsonSerializer.SerializeToUtf8Bytes(e);
-
-        await channel.BasicPublishAsync(exchange: _exchangeName, routingKey: string.Empty, body: body);
-    }
-
-    public async Task CreateManyAsync(IEnumerable<IEvent> events)
-    {
-        var connection = await _lazyConnection.Value;
-        using var channel = await connection.CreateChannelAsync();
-        await channel.ExchangeDeclareAsync(exchange: _exchangeName, type: ExchangeType.Fanout, durable: true);
-
-        var body = JsonSerializer.SerializeToUtf8Bytes(events);
-
-        await channel.BasicPublishAsync(exchange: _exchangeName, routingKey: string.Empty, body: body);
-    }
-
-    public async ValueTask DisposeAsync()
-    {
-        if (_lazyConnection.IsValueCreated)
-        {
-            var connection = await _lazyConnection.Value;
-            await connection.DisposeAsync();
-        }
-    }
-
-    private async Task<IConnection> CreateConnectionAsync()
-    {
-        return await _factory.CreateConnectionAsync();
-    }
-}

src/Core/AdminConsole/Services/Implementations/RabbitMqIntegrationListenerService.cs

@@ -1,5 +1,8 @@
-using System.Text;
-using Bit.Core.Settings;
+#nullable enable
+
+using System.Text;
+using System.Text.Json;
+using Bit.Core.AdminConsole.Models.Data.Integrations;
 using Microsoft.Extensions.Hosting;
 using Microsoft.Extensions.Logging;
 using RabbitMQ.Client;
@@ -9,183 +12,137 @@ namespace Bit.Core.Services;
 
 public class RabbitMqIntegrationListenerService : BackgroundService
 {
-    private const string _deadLetterRoutingKey = "dead-letter";
-    private IChannel _channel;
-    private IConnection _connection;
-    private readonly string _exchangeName;
-    private readonly string _queueName;
-    private readonly string _retryQueueName;
-    private readonly string _deadLetterQueueName;
-    private readonly string _routingKey;
-    private readonly string _retryRoutingKey;
     private readonly int _maxRetries;
+    private readonly string _queueName;
+    private readonly string _routingKey;
+    private readonly string _retryQueueName;
     private readonly IIntegrationHandler _handler;
-    private readonly ConnectionFactory _factory;
+    private readonly Lazy<Task<IChannel>> _lazyChannel;
+    private readonly IRabbitMqService _rabbitMqService;
     private readonly ILogger<RabbitMqIntegrationListenerService> _logger;
-    private readonly int _retryTiming;
 
     public RabbitMqIntegrationListenerService(IIntegrationHandler handler,
         string routingKey,
         string queueName,
         string retryQueueName,
-        string deadLetterQueueName,
-        GlobalSettings globalSettings,
+        int maxRetries,
+        IRabbitMqService rabbitMqService,
         ILogger<RabbitMqIntegrationListenerService> logger)
     {
         _handler = handler;
         _routingKey = routingKey;
-        _retryRoutingKey = $"{_routingKey}-retry";
-        _queueName = queueName;
         _retryQueueName = retryQueueName;
-        _deadLetterQueueName = deadLetterQueueName;
+        _queueName = queueName;
+        _rabbitMqService = rabbitMqService;
         _logger = logger;
-        _exchangeName = globalSettings.EventLogging.RabbitMq.IntegrationExchangeName;
-        _maxRetries = globalSettings.EventLogging.RabbitMq.MaxRetries;
-        _retryTiming = globalSettings.EventLogging.RabbitMq.RetryTiming;
-
-        _factory = new ConnectionFactory
-        {
-            HostName = globalSettings.EventLogging.RabbitMq.HostName,
-            UserName = globalSettings.EventLogging.RabbitMq.Username,
-            Password = globalSettings.EventLogging.RabbitMq.Password
-        };
+        _maxRetries = maxRetries;
+        _lazyChannel = new Lazy<Task<IChannel>>(() => _rabbitMqService.CreateChannelAsync());
     }
 
     public override async Task StartAsync(CancellationToken cancellationToken)
     {
-        _connection = await _factory.CreateConnectionAsync(cancellationToken);
-        _channel = await _connection.CreateChannelAsync(cancellationToken: cancellationToken);
-
-        await _channel.ExchangeDeclareAsync(exchange: _exchangeName,
-                                            type: ExchangeType.Direct,
-                                            durable: true,
-                                            cancellationToken: cancellationToken);
-
-        // Declare main queue
-        await _channel.QueueDeclareAsync(queue: _queueName,
-                                         durable: true,
-                                         exclusive: false,
-                                         autoDelete: false,
-                                         arguments: null,
-                                         cancellationToken: cancellationToken);
-        await _channel.QueueBindAsync(queue: _queueName,
-                                      exchange: _exchangeName,
-                                      routingKey: _routingKey,
-                                      cancellationToken: cancellationToken);
-
-        // Declare retry queue (Configurable TTL, dead-letters back to main queue)
-        await _channel.QueueDeclareAsync(queue: _retryQueueName,
-                                         durable: true,
-                                         exclusive: false,
-                                         autoDelete: false,
-                                         arguments: new Dictionary<string, object>
-                                         {
-                                             { "x-dead-letter-exchange", _exchangeName },
-                                             { "x-dead-letter-routing-key", _routingKey },
-                                             { "x-message-ttl", _retryTiming }
-                                         },
-                                         cancellationToken: cancellationToken);
-        await _channel.QueueBindAsync(queue: _retryQueueName,
-                                      exchange: _exchangeName,
-                                      routingKey: _retryRoutingKey,
-                                      cancellationToken: cancellationToken);
-
-        // Declare dead letter queue
-        await _channel.QueueDeclareAsync(queue: _deadLetterQueueName,
-                                         durable: true,
-                                         exclusive: false,
-                                         autoDelete: false,
-                                         arguments: null,
-                                         cancellationToken: cancellationToken);
-        await _channel.QueueBindAsync(queue: _deadLetterQueueName,
-                                      exchange: _exchangeName,
-                                      routingKey: _deadLetterRoutingKey,
-                                      cancellationToken: cancellationToken);
+        await _rabbitMqService.CreateIntegrationQueuesAsync(
+            _queueName,
+            _retryQueueName,
+            _routingKey,
+            cancellationToken: cancellationToken);
 
         await base.StartAsync(cancellationToken);
     }
 
     protected override async Task ExecuteAsync(CancellationToken cancellationToken)
     {
-        var consumer = new AsyncEventingBasicConsumer(_channel);
+        var channel = await _lazyChannel.Value;
+        var consumer = new AsyncEventingBasicConsumer(channel);
         consumer.ReceivedAsync += async (_, ea) =>
+        {
+            await ProcessReceivedMessageAsync(ea, cancellationToken);
+        };
+
+        await channel.BasicConsumeAsync(queue: _queueName, autoAck: false, consumer: consumer, cancellationToken: cancellationToken);
+    }
+
+    internal async Task ProcessReceivedMessageAsync(BasicDeliverEventArgs ea, CancellationToken cancellationToken)
+    {
+        var channel = await _lazyChannel.Value;
+        try
         {
             var json = Encoding.UTF8.GetString(ea.Body.Span);
 
-            try
+            // Determine if the message came off of the retry queue too soon
+            // If so, place it back on the retry queue
+            var integrationMessage = JsonSerializer.Deserialize<IntegrationMessage>(json);
+            if (integrationMessage is not null &&
+                integrationMessage.DelayUntilDate.HasValue &&
+                integrationMessage.DelayUntilDate.Value > DateTime.UtcNow)
             {
-                var result = await _handler.HandleAsync(json);
-                var message = result.Message;
+                await _rabbitMqService.RepublishToRetryQueueAsync(channel, ea);
+                await channel.BasicAckAsync(ea.DeliveryTag, false, cancellationToken);
+                return;
+            }
 
-                if (result.Success)
+            var result = await _handler.HandleAsync(json);
+            var message = result.Message;
+
+            if (result.Success)
+            {
+                // Successful integration send. Acknowledge message delivery and return
+                await channel.BasicAckAsync(ea.DeliveryTag, false, cancellationToken);
+                return;
+            }
+
+            if (result.Retryable)
+            {
+                // Integration failed, but is retryable - apply delay and check max retries
+                message.ApplyRetry(result.DelayUntilDate);
+
+                if (message.RetryCount < _maxRetries)
                 {
-                    // Successful integration send. Acknowledge message delivery and return
-                    await _channel.BasicAckAsync(ea.DeliveryTag, false, cancellationToken);
-                    return;
-                }
-
-                if (result.Retryable)
-                {
-                    // Integration failed, but is retryable - apply delay and check max retries
-                    message.ApplyRetry(result.DelayUntilDate);
-
-                    if (message.RetryCount < _maxRetries)
-                    {
-                        // Publish message to the retry queue. It will be re-published for retry after a delay
-                        await _channel.BasicPublishAsync(
-                            exchange: _exchangeName,
-                            routingKey: _retryRoutingKey,
-                            body: Encoding.UTF8.GetBytes(message.ToJson()),
-                            cancellationToken: cancellationToken);
-                    }
-                    else
-                    {
-                        // Exceeded the max number of retries; fail and send to dead letter queue
-                        await PublishToDeadLetterAsync(message.ToJson());
-                        _logger.LogWarning("Max retry attempts reached. Sent to DLQ.");
-                    }
+                    // Publish message to the retry queue. It will be re-published for retry after a delay
+                    await _rabbitMqService.PublishToRetryAsync(channel, message, cancellationToken);
                 }
                 else
                 {
-                    // Fatal error (i.e. not retryable) occurred. Send message to dead letter queue without any retries
-                    await PublishToDeadLetterAsync(message.ToJson());
-                    _logger.LogWarning("Non-retryable failure. Sent to DLQ.");
+                    // Exceeded the max number of retries; fail and send to dead letter queue
+                    await _rabbitMqService.PublishToDeadLetterAsync(channel, message, cancellationToken);
+                    _logger.LogWarning("Max retry attempts reached. Sent to DLQ.");
                 }
-
-                // Message has been sent to retry or dead letter queues.
-                // Acknowledge receipt so Rabbit knows it's been processed
-                await _channel.BasicAckAsync(ea.DeliveryTag, false, cancellationToken);
             }
-            catch (Exception ex)
+            else
             {
-                // Unknown error occurred. Acknowledge so Rabbit doesn't keep attempting. Log the error
-                _logger.LogError(ex, "Unhandled error processing integration message.");
-                await _channel.BasicAckAsync(ea.DeliveryTag, false, cancellationToken);
+                // Fatal error (i.e. not retryable) occurred. Send message to dead letter queue without any retries
+                await _rabbitMqService.PublishToDeadLetterAsync(channel, message, cancellationToken);
+                _logger.LogWarning("Non-retryable failure. Sent to DLQ.");
             }
-        };
 
-        await _channel.BasicConsumeAsync(queue: _queueName, autoAck: false, consumer: consumer, cancellationToken: cancellationToken);
-    }
-
-    private async Task PublishToDeadLetterAsync(string json)
-    {
-        await _channel.BasicPublishAsync(
-            exchange: _exchangeName,
-            routingKey: _deadLetterRoutingKey,
-            body: Encoding.UTF8.GetBytes(json));
+            // Message has been sent to retry or dead letter queues.
+            // Acknowledge receipt so Rabbit knows it's been processed
+            await channel.BasicAckAsync(ea.DeliveryTag, false, cancellationToken);
+        }
+        catch (Exception ex)
+        {
+            // Unknown error occurred. Acknowledge so Rabbit doesn't keep attempting. Log the error
+            _logger.LogError(ex, "Unhandled error processing integration message.");
+            await channel.BasicAckAsync(ea.DeliveryTag, false, cancellationToken);
+        }
     }
 
     public override async Task StopAsync(CancellationToken cancellationToken)
     {
-        await _channel.CloseAsync(cancellationToken);
-        await _connection.CloseAsync(cancellationToken);
+        if (_lazyChannel.IsValueCreated)
+        {
+            var channel = await _lazyChannel.Value;
+            await channel.CloseAsync(cancellationToken);
+        }
         await base.StopAsync(cancellationToken);
     }
 
     public override void Dispose()
     {
-        _channel.Dispose();
-        _connection.Dispose();
+        if (_lazyChannel.IsValueCreated && _lazyChannel.Value.IsCompletedSuccessfully)
+        {
+            _lazyChannel.Value.Result.Dispose();
+        }
         base.Dispose();
     }
 }

src/Core/AdminConsole/Services/Implementations/RabbitMqIntegrationPublisher.cs

@@ -1,54 +0,0 @@
-using System.Text;
-using Bit.Core.AdminConsole.Models.Data.Integrations;
-using Bit.Core.Enums;
-using Bit.Core.Settings;
-using RabbitMQ.Client;
-
-namespace Bit.Core.Services;
-
-public class RabbitMqIntegrationPublisher : IIntegrationPublisher, IAsyncDisposable
-{
-    private readonly ConnectionFactory _factory;
-    private readonly Lazy<Task<IConnection>> _lazyConnection;
-    private readonly string _exchangeName;
-
-    public RabbitMqIntegrationPublisher(GlobalSettings globalSettings)
-    {
-        _factory = new ConnectionFactory
-        {
-            HostName = globalSettings.EventLogging.RabbitMq.HostName,
-            UserName = globalSettings.EventLogging.RabbitMq.Username,
-            Password = globalSettings.EventLogging.RabbitMq.Password
-        };
-        _exchangeName = globalSettings.EventLogging.RabbitMq.IntegrationExchangeName;
-
-        _lazyConnection = new Lazy<Task<IConnection>>(CreateConnectionAsync);
-    }
-
-    public async Task PublishAsync(IIntegrationMessage message)
-    {
-        var routingKey = message.IntegrationType.ToRoutingKey();
-        var connection = await _lazyConnection.Value;
-        await using var channel = await connection.CreateChannelAsync();
-
-        await channel.ExchangeDeclareAsync(exchange: _exchangeName, type: ExchangeType.Direct, durable: true);
-
-        var body = Encoding.UTF8.GetBytes(message.ToJson());
-
-        await channel.BasicPublishAsync(exchange: _exchangeName, routingKey: routingKey, body: body);
-    }
-
-    public async ValueTask DisposeAsync()
-    {
-        if (_lazyConnection.IsValueCreated)
-        {
-            var connection = await _lazyConnection.Value;
-            await connection.DisposeAsync();
-        }
-    }
-
-    private async Task<IConnection> CreateConnectionAsync()
-    {
-        return await _factory.CreateConnectionAsync();
-    }
-}

src/Core/AdminConsole/Services/Implementations/RabbitMqService.cs

@@ -0,0 +1,244 @@
+#nullable enable
+
+using System.Text;
+using Bit.Core.AdminConsole.Models.Data.Integrations;
+using Bit.Core.Enums;
+using Bit.Core.Settings;
+using RabbitMQ.Client;
+using RabbitMQ.Client.Events;
+
+namespace Bit.Core.Services;
+
+public class RabbitMqService : IRabbitMqService
+{
+    private const string _deadLetterRoutingKey = "dead-letter";
+
+    private readonly ConnectionFactory _factory;
+    private readonly Lazy<Task<IConnection>> _lazyConnection;
+    private readonly string _deadLetterQueueName;
+    private readonly string _eventExchangeName;
+    private readonly string _integrationExchangeName;
+    private readonly int _retryTiming;
+    private readonly bool _useDelayPlugin;
+
+    public RabbitMqService(GlobalSettings globalSettings)
+    {
+        _factory = new ConnectionFactory
+        {
+            HostName = globalSettings.EventLogging.RabbitMq.HostName,
+            UserName = globalSettings.EventLogging.RabbitMq.Username,
+            Password = globalSettings.EventLogging.RabbitMq.Password
+        };
+        _deadLetterQueueName = globalSettings.EventLogging.RabbitMq.IntegrationDeadLetterQueueName;
+        _eventExchangeName = globalSettings.EventLogging.RabbitMq.EventExchangeName;
+        _integrationExchangeName = globalSettings.EventLogging.RabbitMq.IntegrationExchangeName;
+        _retryTiming = globalSettings.EventLogging.RabbitMq.RetryTiming;
+        _useDelayPlugin = globalSettings.EventLogging.RabbitMq.UseDelayPlugin;
+
+        _lazyConnection = new Lazy<Task<IConnection>>(CreateConnectionAsync);
+    }
+
+    public async Task<IChannel> CreateChannelAsync(CancellationToken cancellationToken = default)
+    {
+        var connection = await _lazyConnection.Value;
+        return await connection.CreateChannelAsync(cancellationToken: cancellationToken);
+    }
+
+    public async Task CreateEventQueueAsync(string queueName, CancellationToken cancellationToken = default)
+    {
+        using var channel = await CreateChannelAsync(cancellationToken);
+        await channel.QueueDeclareAsync(queue: queueName,
+            durable: true,
+            exclusive: false,
+            autoDelete: false,
+            arguments: null,
+            cancellationToken: cancellationToken);
+        await channel.QueueBindAsync(queue: queueName,
+            exchange: _eventExchangeName,
+            routingKey: string.Empty,
+            cancellationToken: cancellationToken);
+    }
+
+    public async Task CreateIntegrationQueuesAsync(
+        string queueName,
+        string retryQueueName,
+        string routingKey,
+        CancellationToken cancellationToken = default)
+    {
+        using var channel = await CreateChannelAsync(cancellationToken);
+        var retryRoutingKey = $"{routingKey}-retry";
+
+        // Declare main integration queue
+        await channel.QueueDeclareAsync(
+            queue: queueName,
+            durable: true,
+            exclusive: false,
+            autoDelete: false,
+            arguments: null,
+            cancellationToken: cancellationToken);
+        await channel.QueueBindAsync(
+            queue: queueName,
+            exchange: _integrationExchangeName,
+            routingKey: routingKey,
+            cancellationToken: cancellationToken);
+
+        if (!_useDelayPlugin)
+        {
+            // Declare retry queue (Configurable TTL, dead-letters back to main queue)
+            // Only needed if NOT using delay plugin
+            await channel.QueueDeclareAsync(queue: retryQueueName,
+                durable: true,
+                exclusive: false,
+                autoDelete: false,
+                arguments: new Dictionary<string, object?>
+                {
+                    { "x-dead-letter-exchange", _integrationExchangeName },
+                    { "x-dead-letter-routing-key", routingKey },
+                    { "x-message-ttl", _retryTiming }
+                },
+                cancellationToken: cancellationToken);
+            await channel.QueueBindAsync(queue: retryQueueName,
+                exchange: _integrationExchangeName,
+                routingKey: retryRoutingKey,
+                cancellationToken: cancellationToken);
+        }
+    }
+
+    public async Task PublishAsync(IIntegrationMessage message)
+    {
+        var routingKey = message.IntegrationType.ToRoutingKey();
+        await using var channel = await CreateChannelAsync();
+
+        var body = Encoding.UTF8.GetBytes(message.ToJson());
+        var properties = new BasicProperties
+        {
+            MessageId = message.MessageId,
+            Persistent = true
+        };
+
+        await channel.BasicPublishAsync(
+            exchange: _integrationExchangeName,
+            mandatory: true,
+            basicProperties: properties,
+            routingKey: routingKey,
+            body: body);
+    }
+
+    public async Task PublishEventAsync(string body)
+    {
+        await using var channel = await CreateChannelAsync();
+        var properties = new BasicProperties
+        {
+            MessageId = Guid.NewGuid().ToString(),
+            Persistent = true
+        };
+
+        await channel.BasicPublishAsync(
+            exchange: _eventExchangeName,
+            mandatory: true,
+            basicProperties: properties,
+            routingKey: string.Empty,
+            body: Encoding.UTF8.GetBytes(body));
+    }
+
+    public async Task PublishToRetryAsync(IChannel channel, IIntegrationMessage message, CancellationToken cancellationToken)
+    {
+        var routingKey = message.IntegrationType.ToRoutingKey();
+        var retryRoutingKey = $"{routingKey}-retry";
+        var properties = new BasicProperties
+        {
+            Persistent = true,
+            MessageId = message.MessageId,
+            Headers = _useDelayPlugin && message.DelayUntilDate.HasValue ?
+                new Dictionary<string, object?>
+                {
+                    ["x-delay"] = Math.Max((int)(message.DelayUntilDate.Value - DateTime.UtcNow).TotalMilliseconds, 0)
+                } :
+                null
+        };
+
+        await channel.BasicPublishAsync(
+            exchange: _integrationExchangeName,
+            routingKey: _useDelayPlugin ? routingKey : retryRoutingKey,
+            mandatory: true,
+            basicProperties: properties,
+            body: Encoding.UTF8.GetBytes(message.ToJson()),
+            cancellationToken: cancellationToken);
+    }
+
+    public async Task PublishToDeadLetterAsync(
+        IChannel channel,
+        IIntegrationMessage message,
+        CancellationToken cancellationToken)
+    {
+        var properties = new BasicProperties
+        {
+            MessageId = message.MessageId,
+            Persistent = true
+        };
+
+        await channel.BasicPublishAsync(
+            exchange: _integrationExchangeName,
+            mandatory: true,
+            basicProperties: properties,
+            routingKey: _deadLetterRoutingKey,
+            body: Encoding.UTF8.GetBytes(message.ToJson()),
+            cancellationToken: cancellationToken);
+    }
+
+    public async Task RepublishToRetryQueueAsync(IChannel channel, BasicDeliverEventArgs eventArgs)
+    {
+        await channel.BasicPublishAsync(
+            exchange: _integrationExchangeName,
+            routingKey: eventArgs.RoutingKey,
+            mandatory: true,
+            basicProperties: new BasicProperties(eventArgs.BasicProperties),
+            body: eventArgs.Body);
+    }
+
+    public async ValueTask DisposeAsync()
+    {
+        if (_lazyConnection.IsValueCreated)
+        {
+            var connection = await _lazyConnection.Value;
+            await connection.DisposeAsync();
+        }
+    }
+
+    private async Task<IConnection> CreateConnectionAsync()
+    {
+        var connection = await _factory.CreateConnectionAsync();
+        using var channel = await connection.CreateChannelAsync();
+
+        // Declare Exchanges
+        await channel.ExchangeDeclareAsync(exchange: _eventExchangeName, type: ExchangeType.Fanout, durable: true);
+        if (_useDelayPlugin)
+        {
+            await channel.ExchangeDeclareAsync(
+                exchange: _integrationExchangeName,
+                type: "x-delayed-message",
+                durable: true,
+                arguments: new Dictionary<string, object?>
+                {
+                    { "x-delayed-type", "direct" }
+                }
+            );
+        }
+        else
+        {
+            await channel.ExchangeDeclareAsync(exchange: _integrationExchangeName, type: ExchangeType.Direct, durable: true);
+        }
+
+        // Declare dead letter queue for Integration exchange
+        await channel.QueueDeclareAsync(queue: _deadLetterQueueName,
+            durable: true,
+            exclusive: false,
+            autoDelete: false,
+            arguments: null);
+        await channel.QueueBindAsync(queue: _deadLetterQueueName,
+            exchange: _integrationExchangeName,
+            routingKey: _deadLetterRoutingKey);
+
+        return connection;
+    }
+}

src/Core/AdminConsole/Services/Implementations/SlackIntegrationHandler.cs

@@ -1,4 +1,6 @@
-using Bit.Core.AdminConsole.Models.Data.Integrations;
+#nullable enable
+
+using Bit.Core.AdminConsole.Models.Data.Integrations;
 
 namespace Bit.Core.Services;
 

src/Core/AdminConsole/Services/Implementations/SlackService.cs

@@ -1,4 +1,6 @@
-using System.Net.Http.Headers;
+#nullable enable
+
+using System.Net.Http.Headers;
 using System.Net.Http.Json;
 using System.Web;
 using Bit.Core.Models.Slack;
@@ -22,7 +24,7 @@ public class SlackService(
 
     public async Task<string> GetChannelIdAsync(string token, string channelName)
     {
-        return (await GetChannelIdsAsync(token, [channelName])).FirstOrDefault();
+        return (await GetChannelIdsAsync(token, [channelName])).FirstOrDefault() ?? string.Empty;
     }
 
     public async Task<List<string>> GetChannelIdsAsync(string token, List<string> channelNames)
@@ -58,7 +60,7 @@ public class SlackService(
             }
             else
             {
-                logger.LogError("Error getting Channel Ids: {Error}", result.Error);
+                logger.LogError("Error getting Channel Ids: {Error}", result?.Error ?? "Unknown Error");
                 nextCursor = string.Empty;
             }
 
@@ -89,7 +91,7 @@ public class SlackService(
                 new KeyValuePair<string, string>("redirect_uri", redirectUrl)
             }));
 
-        SlackOAuthResponse result;
+        SlackOAuthResponse? result;
         try
         {
             result = await tokenResponse.Content.ReadFromJsonAsync<SlackOAuthResponse>();
@@ -99,7 +101,7 @@ public class SlackService(
             result = null;
         }
 
-        if (result == null)
+        if (result is null)
         {
             logger.LogError("Error obtaining token via OAuth: Unknown error");
             return string.Empty;
@@ -130,6 +132,11 @@ public class SlackService(
         var response = await _httpClient.SendAsync(request);
         var result = await response.Content.ReadFromJsonAsync<SlackUserResponse>();
 
+        if (result is null)
+        {
+            logger.LogError("Error retrieving Slack user ID: Unknown error");
+            return string.Empty;
+        }
         if (!result.Ok)
         {
             logger.LogError("Error retrieving Slack user ID: {Error}", result.Error);
@@ -151,6 +158,11 @@ public class SlackService(
         var response = await _httpClient.SendAsync(request);
         var result = await response.Content.ReadFromJsonAsync<SlackDmResponse>();
 
+        if (result is null)
+        {
+            logger.LogError("Error opening DM channel: Unknown error");
+            return string.Empty;
+        }
         if (!result.Ok)
         {
             logger.LogError("Error opening DM channel: {Error}", result.Error);

src/Core/AdminConsole/Services/Implementations/WebhookIntegrationHandler.cs

@@ -1,4 +1,6 @@
-using System.Globalization;
+#nullable enable
+
+using System.Globalization;
 using System.Net;
 using System.Text;
 using Bit.Core.AdminConsole.Models.Data.Integrations;
@@ -29,7 +31,7 @@ public class WebhookIntegrationHandler(IHttpClientFactory httpClientFactory)
             case HttpStatusCode.ServiceUnavailable:
             case HttpStatusCode.GatewayTimeout:
                 result.Retryable = true;
-                result.FailureReason = response.ReasonPhrase;
+                result.FailureReason = response.ReasonPhrase ?? $"Failure with status code: {(int)response.StatusCode}";
 
                 if (response.Headers.TryGetValues("Retry-After", out var values))
                 {
@@ -52,7 +54,7 @@ public class WebhookIntegrationHandler(IHttpClientFactory httpClientFactory)
                 break;
             default:
                 result.Retryable = false;
-                result.FailureReason = response.ReasonPhrase;
+                result.FailureReason = response.ReasonPhrase ?? $"Failure with status code {(int)response.StatusCode}";
                 break;
         }
 

src/Core/Billing/Services/Implementations/OrganizationBillingService.cs

@@ -78,13 +78,14 @@ public class OrganizationBillingService(
         var isEligibleForSelfHost = await IsEligibleForSelfHostAsync(organization);
 
         var isManaged = organization.Status == OrganizationStatusType.Managed;
-
+        var orgOccupiedSeats = await organizationUserRepository.GetOccupiedSeatCountByOrganizationIdAsync(organization.Id);
         if (string.IsNullOrWhiteSpace(organization.GatewaySubscriptionId))
         {
             return OrganizationMetadata.Default with
             {
                 IsEligibleForSelfHost = isEligibleForSelfHost,
-                IsManaged = isManaged
+                IsManaged = isManaged,
+                OrganizationOccupiedSeats = orgOccupiedSeats
             };
         }
 
@@ -108,8 +109,6 @@ public class OrganizationBillingService(
             ? await stripeAdapter.InvoiceGetAsync(subscription.LatestInvoiceId, new InvoiceGetOptions())
             : null;
 
-        var orgOccupiedSeats = await organizationUserRepository.GetOccupiedSeatCountByOrganizationIdAsync(organization.Id);
-
         return new OrganizationMetadata(
             isEligibleForSelfHost,
             isManaged,
@@ -420,7 +419,7 @@ public class OrganizationBillingService(
         var setNonUSBusinessUseToReverseCharge =
             featureService.IsEnabled(FeatureFlagKeys.PM21092_SetNonUSBusinessUseToReverseCharge);
 
-        if (setNonUSBusinessUseToReverseCharge)
+        if (setNonUSBusinessUseToReverseCharge && customer.HasBillingLocation())
         {
             subscriptionCreateOptions.AutomaticTax = new SubscriptionAutomaticTaxOptions { Enabled = true };
         }

src/Core/Constants.cs

@@ -145,7 +145,6 @@ public static class FeatureFlagKeys
     public const string PM17772_AdminInitiatedSponsorships = "pm-17772-admin-initiated-sponsorships";
     public const string UsePricingService = "use-pricing-service";
     public const string PM12276Breadcrumbing = "pm-12276-breadcrumbing-for-business-features";
-    public const string PM18794_ProviderPaymentMethod = "pm-18794-provider-payment-method";
     public const string PM19422_AllowAutomaticTaxUpdates = "pm-19422-allow-automatic-tax-updates";
     public const string PM199566_UpdateMSPToChargeAutomatically = "pm-199566-update-msp-to-charge-automatically";
     public const string PM19956_RequireProviderPaymentMethodDuringSetup = "pm-19956-require-provider-payment-method-during-setup";

src/Core/Exceptions/BadRequestException.cs

@@ -3,6 +3,8 @@ using Microsoft.AspNetCore.Mvc.ModelBinding;
 
 namespace Bit.Core.Exceptions;
 
+#nullable enable
+
 public class BadRequestException : Exception
 {
     public BadRequestException() : base()
@@ -41,5 +43,5 @@ public class BadRequestException : Exception
         }
     }
 
-    public ModelStateDictionary ModelState { get; set; }
+    public ModelStateDictionary? ModelState { get; set; }
 }

src/Core/Exceptions/ConflictException.cs

@@ -1,5 +1,7 @@
 namespace Bit.Core.Exceptions;
 
+#nullable enable
+
 public class ConflictException : Exception
 {
     public ConflictException() : base("Conflict.") { }

src/Core/Exceptions/DnsQueryException.cs

@@ -1,5 +1,7 @@
 namespace Bit.Core.Exceptions;
 
+#nullable enable
+
 public class DnsQueryException : Exception
 {
     public DnsQueryException(string message)

src/Core/Exceptions/DomainClaimedException.cs

@@ -1,5 +1,7 @@
 namespace Bit.Core.Exceptions;
 
+#nullable enable
+
 public class DomainClaimedException : Exception
 {
     public DomainClaimedException()

src/Core/Exceptions/DomainVerifiedException.cs

@@ -1,5 +1,7 @@
 namespace Bit.Core.Exceptions;
 
+#nullable enable
+
 public class DomainVerifiedException : Exception
 {
     public DomainVerifiedException()

src/Core/Exceptions/DuplicateDomainException.cs

@@ -1,5 +1,7 @@
 namespace Bit.Core.Exceptions;
 
+#nullable enable
+
 public class DuplicateDomainException : Exception
 {
     public DuplicateDomainException()

src/Core/Exceptions/FeatureUnavailableException.cs

@@ -1,5 +1,7 @@
 namespace Bit.Core.Exceptions;
 
+#nullable enable
+
 /// <summary>
 /// Exception to throw when a requested feature is not yet enabled/available for the requesting context.
 /// </summary>

src/Core/Exceptions/GatewayException.cs

@@ -1,8 +1,10 @@
 namespace Bit.Core.Exceptions;
 
+#nullable enable
+
 public class GatewayException : Exception
 {
-    public GatewayException(string message, Exception innerException = null)
+    public GatewayException(string message, Exception? innerException = null)
         : base(message, innerException)
     { }
 }

src/Core/Exceptions/InvalidEmailException.cs

@@ -1,5 +1,7 @@
 namespace Bit.Core.Exceptions;
 
+#nullable enable
+
 public class InvalidEmailException : Exception
 {
     public InvalidEmailException()

src/Core/Exceptions/InvalidGatewayCustomerIdException.cs

@@ -1,5 +1,7 @@
 namespace Bit.Core.Exceptions;
 
+#nullable enable
+
 public class InvalidGatewayCustomerIdException : Exception
 {
     public InvalidGatewayCustomerIdException()

src/Core/Exceptions/NotFoundException.cs

@@ -1,5 +1,7 @@
 namespace Bit.Core.Exceptions;
 
+#nullable enable
+
 public class NotFoundException : Exception
 {
     public NotFoundException() : base()

src/Core/HostedServices/ApplicationCacheHostedService.cs

@@ -10,9 +10,11 @@ using Microsoft.Extensions.Logging;
 
 namespace Bit.Core.HostedServices;
 
+#nullable enable
+
 public class ApplicationCacheHostedService : IHostedService, IDisposable
 {
-    private readonly InMemoryServiceBusApplicationCacheService _applicationCacheService;
+    private readonly InMemoryServiceBusApplicationCacheService? _applicationCacheService;
     private readonly IOrganizationRepository _organizationRepository;
     protected readonly ILogger<ApplicationCacheHostedService> _logger;
     private readonly ServiceBusClient _serviceBusClient;
@@ -20,8 +22,8 @@ public class ApplicationCacheHostedService : IHostedService, IDisposable
     private readonly ServiceBusAdministrationClient _serviceBusAdministrationClient;
     private readonly string _subName;
     private readonly string _topicName;
-    private CancellationTokenSource _cts;
-    private Task _executingTask;
+    private CancellationTokenSource? _cts;
+    private Task? _executingTask;
 
 
     public ApplicationCacheHostedService(
@@ -67,13 +69,17 @@ public class ApplicationCacheHostedService : IHostedService, IDisposable
     {
         await _subscriptionReceiver.CloseAsync(cancellationToken);
         await _serviceBusClient.DisposeAsync();
-        _cts.Cancel();
+        _cts?.Cancel();
         try
         {
             await _serviceBusAdministrationClient.DeleteSubscriptionAsync(_topicName, _subName, cancellationToken);
         }
         catch { }
-        await _executingTask;
+
+        if (_executingTask != null)
+        {
+            await _executingTask;
+        }
     }
 
     public virtual void Dispose()

src/Core/HostedServices/IpRateLimitSeedStartupService.cs

@@ -3,6 +3,8 @@ using Microsoft.Extensions.Hosting;
 
 namespace Bit.Core.HostedServices;
 
+#nullable enable
+
 /// <summary>
 /// A startup service that will seed the IP rate limiting stores with any values in the
 /// GlobalSettings configuration.

src/Core/Jobs/BaseJob.cs

@@ -3,6 +3,8 @@ using Quartz;
 
 namespace Bit.Core.Jobs;
 
+#nullable enable
+
 public abstract class BaseJob : IJob
 {
     protected readonly ILogger _logger;

src/Core/Jobs/BaseJobsHostedService.cs

@@ -8,6 +8,8 @@ using Quartz.Impl.Matchers;
 
 namespace Bit.Core.Jobs;
 
+#nullable enable
+
 public abstract class BaseJobsHostedService : IHostedService, IDisposable
 {
     private const int MaximumJobRetries = 10;
@@ -16,7 +18,7 @@ public abstract class BaseJobsHostedService : IHostedService, IDisposable
     private readonly ILogger<JobListener> _listenerLogger;
     protected readonly ILogger _logger;
 
-    private IScheduler _scheduler;
+    private IScheduler? _scheduler;
     protected GlobalSettings _globalSettings;
 
     public BaseJobsHostedService(
@@ -31,7 +33,7 @@ public abstract class BaseJobsHostedService : IHostedService, IDisposable
         _globalSettings = globalSettings;
     }
 
-    public IEnumerable<Tuple<Type, ITrigger>> Jobs { get; protected set; }
+    public IEnumerable<Tuple<Type, ITrigger>>? Jobs { get; protected set; }
 
     public virtual async Task StartAsync(CancellationToken cancellationToken)
     {
@@ -61,10 +63,19 @@ public abstract class BaseJobsHostedService : IHostedService, IDisposable
         _scheduler.ListenerManager.AddJobListener(new JobListener(_listenerLogger),
             GroupMatcher<JobKey>.AnyGroup());
         await _scheduler.Start(cancellationToken);
+
+        var jobKeys = new List<JobKey>();
+        var triggerKeys = new List<TriggerKey>();
+
         if (Jobs != null)
         {
             foreach (var (job, trigger) in Jobs)
             {
+                jobKeys.Add(JobBuilder.Create(job)
+                    .WithIdentity(job.FullName!)
+                    .Build().Key);
+                triggerKeys.Add(trigger.Key);
+
                 for (var retry = 0; retry < MaximumJobRetries; retry++)
                 {
                     // There's a race condition when starting multiple containers simultaneously, retry until it succeeds..
@@ -77,7 +88,7 @@ public abstract class BaseJobsHostedService : IHostedService, IDisposable
                         }
 
                         var jobDetail = JobBuilder.Create(job)
-                            .WithIdentity(job.FullName)
+                            .WithIdentity(job.FullName!)
                             .Build();
 
                         var dupeJ = await _scheduler.GetJobDetail(jobDetail.Key);
@@ -106,13 +117,6 @@ public abstract class BaseJobsHostedService : IHostedService, IDisposable
 
         // Delete old Jobs and Triggers
         var existingJobKeys = await _scheduler.GetJobKeys(GroupMatcher<JobKey>.AnyGroup());
-        var jobKeys = Jobs.Select(j =>
-        {
-            var job = j.Item1;
-            return JobBuilder.Create(job)
-                .WithIdentity(job.FullName)
-                .Build().Key;
-        });
 
         foreach (var key in existingJobKeys)
         {
@@ -126,7 +130,6 @@ public abstract class BaseJobsHostedService : IHostedService, IDisposable
         }
 
         var existingTriggerKeys = await _scheduler.GetTriggerKeys(GroupMatcher<TriggerKey>.AnyGroup());
-        var triggerKeys = Jobs.Select(j => j.Item2.Key);
 
         foreach (var key in existingTriggerKeys)
         {
@@ -142,7 +145,10 @@ public abstract class BaseJobsHostedService : IHostedService, IDisposable
 
     public virtual async Task StopAsync(CancellationToken cancellationToken)
     {
-        await _scheduler?.Shutdown(cancellationToken);
+        if (_scheduler is not null)
+        {
+            await _scheduler.Shutdown(cancellationToken);
+        }
     }
 
     public virtual void Dispose()

src/Core/Jobs/JobFactory.cs

@@ -4,6 +4,8 @@ using Quartz.Spi;
 
 namespace Bit.Core.Jobs;
 
+#nullable enable
+
 public class JobFactory : IJobFactory
 {
     private readonly IServiceProvider _container;
@@ -16,7 +18,7 @@ public class JobFactory : IJobFactory
     public IJob NewJob(TriggerFiredBundle bundle, IScheduler scheduler)
     {
         var scope = _container.CreateScope();
-        return scope.ServiceProvider.GetService(bundle.JobDetail.JobType) as IJob;
+        return (scope.ServiceProvider.GetService(bundle.JobDetail.JobType) as IJob)!;
     }
 
     public void ReturnJob(IJob job)

src/Core/Jobs/JobListener.cs

@@ -3,6 +3,8 @@ using Quartz;
 
 namespace Bit.Core.Jobs;
 
+#nullable enable
+
 public class JobListener : IJobListener
 {
     private readonly ILogger<JobListener> _logger;
@@ -28,7 +30,7 @@ public class JobListener : IJobListener
         return Task.FromResult(0);
     }
 
-    public Task JobWasExecuted(IJobExecutionContext context, JobExecutionException jobException,
+    public Task JobWasExecuted(IJobExecutionContext context, JobExecutionException? jobException,
         CancellationToken cancellationToken = default(CancellationToken))
     {
         _logger.LogInformation(Constants.BypassFiltersEventId, null, "Finished job {0} at {1}.",

src/Core/KeyManagement/Entities/UserSignatureKeyPair.cs

@@ -1,6 +1,6 @@
 using System.ComponentModel.DataAnnotations;
 using Bit.Core.Entities;
-using Bit.Core.Enums;
+using Bit.Core.KeyManagement.Enums;
 using Bit.Core.KeyManagement.Models.Data;
 using Bit.Core.Utilities;
 

src/Core/KeyManagement/Enums/SignatureAlgorithm.cs

@@ -1,4 +1,4 @@
-namespace Bit.Core.Enums;
+namespace Bit.Core.KeyManagement.Enums;
 
 // <summary>
 // Represents the algorithm / digital signature scheme used for a signature key pair.

src/Core/KeyManagement/Models/Data/SignatureKeyPairData.cs

@@ -1,7 +1,7 @@
 #nullable enable
 
 using System.Text.Json.Serialization;
-using Bit.Core.Enums;
+using Bit.Core.KeyManagement.Enums;
 
 namespace Bit.Core.KeyManagement.Models.Data;
 

src/Core/NotificationHub/INotificationHubClientProxy.cs

@@ -2,6 +2,8 @@
 
 namespace Bit.Core.NotificationHub;
 
+#nullable enable
+
 public interface INotificationHubProxy
 {
     Task<(INotificationHubClient Client, NotificationOutcome Outcome)[]> SendTemplateNotificationAsync(IDictionary<string, string> properties, string tagExpression);

src/Core/NotificationHub/INotificationHubPool.cs

@@ -2,6 +2,8 @@
 
 namespace Bit.Core.NotificationHub;
 
+#nullable enable
+
 public interface INotificationHubPool
 {
     NotificationHubConnection ConnectionFor(Guid comb);

src/Core/NotificationHub/NotificationHubClientProxy.cs

@@ -2,6 +2,8 @@
 
 namespace Bit.Core.NotificationHub;
 
+#nullable enable
+
 public class NotificationHubClientProxy : INotificationHubProxy
 {
     private readonly IEnumerable<INotificationHubClient> _clients;

src/Core/NotificationHub/NotificationHubConnection.cs

@@ -1,4 +1,5 @@
-using System.Security.Cryptography;
+using System.Diagnostics.CodeAnalysis;
+using System.Security.Cryptography;
 using System.Text;
 using System.Web;
 using Bit.Core.Settings;
@@ -7,16 +8,18 @@ using Microsoft.Azure.NotificationHubs;
 
 namespace Bit.Core.NotificationHub;
 
+#nullable enable
+
 public class NotificationHubConnection
 {
-    public string HubName { get; init; }
-    public string ConnectionString { get; init; }
+    public string? HubName { get; init; }
+    public string? ConnectionString { get; init; }
     private Lazy<NotificationHubConnectionStringBuilder> _parsedConnectionString;
     public Uri Endpoint => _parsedConnectionString.Value.Endpoint;
     private string SasKey => _parsedConnectionString.Value.SharedAccessKey;
     private string SasKeyName => _parsedConnectionString.Value.SharedAccessKeyName;
     public bool EnableSendTracing { get; init; }
-    private NotificationHubClient _hubClient;
+    private NotificationHubClient? _hubClient;
     /// <summary>
     /// Gets the NotificationHubClient for this connection.
     ///
@@ -155,9 +158,10 @@ public class NotificationHubConnection
         };
     }
 
+    [MemberNotNull(nameof(_hubClient))]
     private NotificationHubConnection Init()
     {
-        HubClient = NotificationHubClient.CreateClientFromConnectionString(ConnectionString, HubName, EnableSendTracing);
+        _hubClient = NotificationHubClient.CreateClientFromConnectionString(ConnectionString, HubName, EnableSendTracing);
         return this;
     }
 

src/Core/NotificationHub/NotificationHubPool.cs

@@ -5,6 +5,8 @@ using Microsoft.Extensions.Logging;
 
 namespace Bit.Core.NotificationHub;
 
+#nullable enable
+
 public class NotificationHubPool : INotificationHubPool
 {
     private List<NotificationHubConnection> _connections { get; }

src/Core/NotificationHub/NotificationHubPushNotificationService.cs

@@ -19,6 +19,8 @@ using Notification = Bit.Core.NotificationCenter.Entities.Notification;
 
 namespace Bit.Core.NotificationHub;
 
+#nullable enable
+
 /// <summary>
 /// Sends mobile push notifications to the Azure Notification Hub.
 /// Used by Cloud-Hosted environments.

src/Core/NotificationHub/NotificationHubPushRegistrationService.cs

@@ -13,6 +13,8 @@ using Microsoft.Extensions.Logging;
 
 namespace Bit.Core.NotificationHub;
 
+#nullable enable
+
 public class NotificationHubPushRegistrationService : IPushRegistrationService
 {
     private static readonly JsonSerializerOptions webPushSerializationOptions = new()
@@ -37,7 +39,7 @@ public class NotificationHubPushRegistrationService : IPushRegistrationService
     }
 
     public async Task CreateOrUpdateRegistrationAsync(PushRegistrationData data, string deviceId, string userId,
-        string identifier, DeviceType type, IEnumerable<string> organizationIds, Guid installationId)
+        string? identifier, DeviceType type, IEnumerable<string> organizationIds, Guid installationId)
     {
         var orgIds = organizationIds.ToList();
         var clientType = DeviceTypes.ToClientType(type);
@@ -79,7 +81,7 @@ public class NotificationHubPushRegistrationService : IPushRegistrationService
     }
 
     private async Task CreateOrUpdateMobileRegistrationAsync(Installation installation, string userId,
-        string identifier, ClientType clientType, List<string> organizationIds, DeviceType type, Guid installationId)
+        string? identifier, ClientType clientType, List<string> organizationIds, DeviceType type, Guid installationId)
     {
         if (string.IsNullOrWhiteSpace(installation.PushChannel))
         {
@@ -137,7 +139,7 @@ public class NotificationHubPushRegistrationService : IPushRegistrationService
     }
 
     private async Task CreateOrUpdateWebRegistrationAsync(string endpoint, string p256dh, string auth, Installation installation, string userId,
-        string identifier, ClientType clientType, List<string> organizationIds, Guid installationId)
+        string? identifier, ClientType clientType, List<string> organizationIds, Guid installationId)
     {
         // The Azure SDK is currently lacking support for web push registrations.
         // We need to use the REST API directly.
@@ -187,7 +189,7 @@ public class NotificationHubPushRegistrationService : IPushRegistrationService
     }
 
     private static KeyValuePair<string, InstallationTemplate> BuildInstallationTemplate(string templateId, [StringSyntax(StringSyntaxAttribute.Json)] string templateBody,
-        string userId, string identifier, ClientType clientType, List<string> organizationIds, Guid installationId)
+        string userId, string? identifier, ClientType clientType, List<string> organizationIds, Guid installationId)
     {
         var fullTemplateId = $"template:{templateId}";
 

src/Core/NotificationHub/PushRegistrationData.cs

@@ -1,5 +1,7 @@
 namespace Bit.Core.NotificationHub;
 
+#nullable enable
+
 public record struct WebPushRegistrationData
 {
     public string Endpoint { get; init; }
@@ -9,9 +11,9 @@ public record struct WebPushRegistrationData
 
 public record class PushRegistrationData
 {
-    public string Token { get; set; }
+    public string? Token { get; set; }
     public WebPushRegistrationData? WebPush { get; set; }
-    public PushRegistrationData(string token)
+    public PushRegistrationData(string? token)
     {
         Token = token;
     }

src/Core/Settings/GlobalSettings.cs

@@ -327,6 +327,7 @@ public class GlobalSettings : IGlobalSettings
 
             public int MaxRetries { get; set; } = 3;
             public int RetryTiming { get; set; } = 30000; // 30s
+            public bool UseDelayPlugin { get; set; } = false;
             public virtual string EventRepositoryQueueName { get; set; } = "events-write-queue";
             public virtual string IntegrationDeadLetterQueueName { get; set; } = "integration-dead-letter-queue";
             public virtual string SlackEventsQueueName { get; set; } = "events-slack-queue";

src/Core/Vault/Services/ICipherService.cs

@@ -24,7 +24,7 @@ public interface ICipherService
     Task DeleteFolderAsync(Folder folder);
     Task ShareAsync(Cipher originalCipher, Cipher cipher, Guid organizationId, IEnumerable<Guid> collectionIds,
         Guid userId, DateTime? lastKnownRevisionDate);
-    Task<IEnumerable<Cipher>> ShareManyAsync(IEnumerable<(Cipher cipher, DateTime? lastKnownRevisionDate)> ciphers, Guid organizationId,
+    Task<IEnumerable<CipherDetails>> ShareManyAsync(IEnumerable<(CipherDetails cipher, DateTime? lastKnownRevisionDate)> ciphers, Guid organizationId,
         IEnumerable<Guid> collectionIds, Guid sharingUserId);
     Task SaveCollectionsAsync(Cipher cipher, IEnumerable<Guid> collectionIds, Guid savingUserId, bool orgAdmin);
     Task SoftDeleteAsync(CipherDetails cipherDetails, Guid deletingUserId, bool orgAdmin = false);

src/Core/Vault/Services/Implementations/CipherService.cs

@@ -625,7 +625,7 @@ public class CipherService : ICipherService
         await _pushService.PushSyncCipherUpdateAsync(cipher, collectionIds);
     }
 
-    public async Task<IEnumerable<Cipher>> ShareManyAsync(IEnumerable<(Cipher cipher, DateTime? lastKnownRevisionDate)> cipherInfos,
+    public async Task<IEnumerable<CipherDetails>> ShareManyAsync(IEnumerable<(CipherDetails cipher, DateTime? lastKnownRevisionDate)> cipherInfos,
         Guid organizationId, IEnumerable<Guid> collectionIds, Guid sharingUserId)
     {
         var cipherIds = new List<Guid>();

src/Icons/Controllers/IconsController.cs

@@ -8,16 +8,6 @@ namespace Bit.Icons.Controllers;
 [Route("")]
 public class IconsController : Controller
 {
-    // Basic bwi-globe icon
-    private static readonly byte[] _notFoundImage = Convert.FromBase64String("iVBORw0KGgoAAAANSUhEUg" +
-        "AAABMAAAATCAQAAADYWf5HAAABu0lEQVR42nXSvWuTURTH8R+t0heI9Y04aJycdBLNJNrBFBU7OFgUER3q21I0bXK+JwZ" +
-        "pXISm/QdcRB3EgqBBsNihsUbbgODQQSKCuKSDOApJuuhj8tCYQj/jvYfD795z1MZ+nBKrNKhSwrMxbZTrtRnqlEjZkB/x" +
-        "C/xmhZrlc71qS0Up8yVzTCGucFNKD1JhORVd70SZNU4okNx5d4+U2UXRIpJFWLClsR79YzN88wQvLWNzzPKEeS/wkQGpW" +
-        "VhhqhW8TtDJD3Mm1x/23zLSrZCdpBY8BueTNjHSbc+8wC9HlHgU5Aj5AW5zPdcVdpq0UcknWBSr/pjixO4gfp899Kd23p" +
-        "M2qQCH7LkCnqAqGh73OK/8NPOcaibr90LrW/yWAnaUhqjaOSl9nFR2r5rsqo22ypn1B5IN8VOUMHVgOnNQIX+d62plcz6" +
-        "rg1/jskK8CMb4we4pG6OWHtR/LBJkC2E4a7ZPkuX5ntumAOM2xxveclEhLvGH6XCmLPs735Eetrw63NnOgr9P9q1viC3x" +
-        "lRUGOjImqFDuOBvrYYoaZU9z1uPpYae5NfdvbNVG2ZjDIlXq/oMi46lo++4vjjPBl2Dlg00AAAAASUVORK5CYII=");
-
     private readonly IMemoryCache _memoryCache;
     private readonly IDomainMappingService _domainMappingService;
     private readonly IIconFetchingService _iconFetchingService;
@@ -99,7 +89,7 @@ public class IconsController : Controller
 
         if (icon == null)
         {
-            return new FileContentResult(_notFoundImage, "image/png");
+            return new NotFoundResult();
         }
 
         return new FileContentResult(icon.Image, icon.Format);

src/Infrastructure.Dapper/KeyManagement/Repositories/UserSignatureKeyPairRepository.cs

@@ -5,6 +5,7 @@ using Bit.Core.KeyManagement.Models.Data;
 using Bit.Core.KeyManagement.Repositories;
 using Bit.Core.KeyManagement.UserKey;
 using Bit.Core.Settings;
+using Bit.Core.Utilities;
 using Bit.Infrastructure.Dapper.Repositories;
 using Dapper;
 using Microsoft.Data.SqlClient;
@@ -45,7 +46,7 @@ public class UserSignatureKeyPairRepository : Repository<UserSignatureKeyPair, G
                 "[dbo].[UserSignatureKeyPair_SetForRotation]",
                 new
                 {
-                    Id = Guid.NewGuid(),
+                    Id = CoreHelpers.GenerateComb(),
                     UserId = userId,
                     SignatureAlgorithm = (byte)signingKeys.SignatureAlgorithm,
                     SigningKey = signingKeys.WrappedSigningKey,

src/Infrastructure.EntityFramework/KeyManagement/Repositories/UserSignatureKeyPairRepository.cs

@@ -4,6 +4,7 @@ using AutoMapper;
 using Bit.Core.KeyManagement.Models.Data;
 using Bit.Core.KeyManagement.Repositories;
 using Bit.Core.KeyManagement.UserKey;
+using Bit.Core.Utilities;
 using Bit.Infrastructure.EntityFramework.Repositories;
 using Microsoft.EntityFrameworkCore;
 using Microsoft.Extensions.DependencyInjection;
@@ -37,7 +38,7 @@ public class UserSignatureKeyPairRepository : Repository<Core.KeyManagement.Enti
             var dbContext = GetDatabaseContext(scope);
             var entity = new Models.UserSignatureKeyPair
             {
-                Id = Guid.NewGuid(),
+                Id = CoreHelpers.GenerateComb(),
                 UserId = userId,
                 SignatureAlgorithm = signingKeys.SignatureAlgorithm,
                 SigningKey = signingKeys.WrappedSigningKey,

src/SharedWeb/Utilities/ServiceCollectionExtensions.cs

@@ -550,7 +550,8 @@ public static class ServiceCollectionExtensions
             if (CoreHelpers.SettingHasValue(globalSettings.EventLogging.AzureServiceBus.ConnectionString) &&
                 CoreHelpers.SettingHasValue(globalSettings.EventLogging.AzureServiceBus.EventTopicName))
             {
-                services.AddKeyedSingleton<IEventWriteService, AzureServiceBusEventWriteService>("broadcast");
+                services.AddSingleton<IEventIntegrationPublisher, AzureServiceBusService>();
+                services.AddKeyedSingleton<IEventWriteService, EventIntegrationEventWriteService>("broadcast");
             }
             else
             {
@@ -563,7 +564,8 @@ public static class ServiceCollectionExtensions
 
             if (IsRabbitMqEnabled(globalSettings))
             {
-                services.AddKeyedSingleton<IEventWriteService, RabbitMqEventWriteService>("broadcast");
+                services.AddSingleton<IEventIntegrationPublisher, RabbitMqService>();
+                services.AddKeyedSingleton<IEventWriteService, EventIntegrationEventWriteService>("broadcast");
             }
             else
             {
@@ -585,13 +587,15 @@ public static class ServiceCollectionExtensions
         services.AddSingleton<IEventRepository, TableStorageRepos.EventRepository>();
         services.AddSingleton<AzureTableStorageEventHandler>();
         services.AddKeyedSingleton<IEventWriteService, RepositoryEventWriteService>("persistent");
-
         services.AddSingleton<IHostedService>(provider =>
             new AzureServiceBusEventListenerService(
                 handler: provider.GetRequiredService<AzureTableStorageEventHandler>(),
-                logger: provider.GetRequiredService<ILogger<AzureServiceBusEventListenerService>>(),
+                serviceBusService: provider.GetRequiredService<IAzureServiceBusService>(),
+                subscriptionName: globalSettings.EventLogging.AzureServiceBus.EventRepositorySubscriptionName,
                 globalSettings: globalSettings,
-                subscriptionName: globalSettings.EventLogging.AzureServiceBus.EventRepositorySubscriptionName));
+                logger: provider.GetRequiredService<ILogger<AzureServiceBusEventListenerService>>()
+            )
+        );
 
         return services;
     }
@@ -607,12 +611,10 @@ public static class ServiceCollectionExtensions
     {
         var routingKey = integrationType.ToRoutingKey();
 
-        services.AddSingleton<IIntegrationPublisher, AzureServiceBusIntegrationPublisher>();
-
         services.AddKeyedSingleton<IEventMessageHandler>(routingKey, (provider, _) =>
             new EventIntegrationHandler<TConfig>(
                 integrationType,
-                provider.GetRequiredService<IIntegrationPublisher>(),
+                provider.GetRequiredService<IEventIntegrationPublisher>(),
                 provider.GetRequiredService<IOrganizationIntegrationConfigurationRepository>(),
                 provider.GetRequiredService<IUserRepository>(),
                 provider.GetRequiredService<IOrganizationRepository>()));
@@ -620,18 +622,22 @@ public static class ServiceCollectionExtensions
         services.AddSingleton<IHostedService>(provider =>
             new AzureServiceBusEventListenerService(
                 handler: provider.GetRequiredKeyedService<IEventMessageHandler>(routingKey),
-                logger: provider.GetRequiredService<ILogger<AzureServiceBusEventListenerService>>(),
+                serviceBusService: provider.GetRequiredService<IAzureServiceBusService>(),
+                subscriptionName: eventSubscriptionName,
                 globalSettings: globalSettings,
-                subscriptionName: eventSubscriptionName));
+                logger: provider.GetRequiredService<ILogger<AzureServiceBusEventListenerService>>()
+            )
+        );
 
         services.AddSingleton<IIntegrationHandler<TConfig>, THandler>();
-
         services.AddSingleton<IHostedService>(provider =>
             new AzureServiceBusIntegrationListenerService(
                 handler: provider.GetRequiredService<IIntegrationHandler<TConfig>>(),
+                topicName: globalSettings.EventLogging.AzureServiceBus.IntegrationTopicName,
                 subscriptionName: integrationSubscriptionName,
-                logger: provider.GetRequiredService<ILogger<AzureServiceBusIntegrationListenerService>>(),
-                globalSettings: globalSettings));
+                maxRetries: globalSettings.EventLogging.AzureServiceBus.MaxRetries,
+                serviceBusService: provider.GetRequiredService<IAzureServiceBusService>(),
+                logger: provider.GetRequiredService<ILogger<AzureServiceBusIntegrationListenerService>>()));
 
         return services;
     }
@@ -642,6 +648,8 @@ public static class ServiceCollectionExtensions
             !CoreHelpers.SettingHasValue(globalSettings.EventLogging.AzureServiceBus.EventTopicName))
             return services;
 
+        services.AddSingleton<IAzureServiceBusService, AzureServiceBusService>();
+        services.AddSingleton<IEventIntegrationPublisher, AzureServiceBusService>();
         services.AddAzureServiceBusEventRepositoryListener(globalSettings);
 
         services.AddSlackService(globalSettings);
@@ -668,9 +676,9 @@ public static class ServiceCollectionExtensions
         services.AddSingleton<IHostedService>(provider =>
             new RabbitMqEventListenerService(
                 provider.GetRequiredService<EventRepositoryHandler>(),
-                provider.GetRequiredService<ILogger<RabbitMqEventListenerService>>(),
-                globalSettings,
-                globalSettings.EventLogging.RabbitMq.EventRepositoryQueueName));
+                globalSettings.EventLogging.RabbitMq.EventRepositoryQueueName,
+                provider.GetRequiredService<IRabbitMqService>(),
+                provider.GetRequiredService<ILogger<RabbitMqEventListenerService>>()));
 
         return services;
     }
@@ -679,19 +687,17 @@ public static class ServiceCollectionExtensions
         string eventQueueName,
         string integrationQueueName,
         string integrationRetryQueueName,
-        string integrationDeadLetterQueueName,
-        IntegrationType integrationType,
-        GlobalSettings globalSettings)
+        int maxRetries,
+        IntegrationType integrationType)
         where TConfig : class
         where THandler : class, IIntegrationHandler<TConfig>
     {
         var routingKey = integrationType.ToRoutingKey();
 
-        services.AddSingleton<IIntegrationPublisher, RabbitMqIntegrationPublisher>();
         services.AddKeyedSingleton<IEventMessageHandler>(routingKey, (provider, _) =>
             new EventIntegrationHandler<TConfig>(
                 integrationType,
-                provider.GetRequiredService<IIntegrationPublisher>(),
+                provider.GetRequiredService<IEventIntegrationPublisher>(),
                 provider.GetRequiredService<IOrganizationIntegrationConfigurationRepository>(),
                 provider.GetRequiredService<IUserRepository>(),
                 provider.GetRequiredService<IOrganizationRepository>()));
@@ -699,9 +705,9 @@ public static class ServiceCollectionExtensions
         services.AddSingleton<IHostedService>(provider =>
             new RabbitMqEventListenerService(
                 provider.GetRequiredKeyedService<IEventMessageHandler>(routingKey),
-                provider.GetRequiredService<ILogger<RabbitMqEventListenerService>>(),
-                globalSettings,
-                eventQueueName));
+                eventQueueName,
+                provider.GetRequiredService<IRabbitMqService>(),
+                provider.GetRequiredService<ILogger<RabbitMqEventListenerService>>()));
 
         services.AddSingleton<IIntegrationHandler<TConfig>, THandler>();
         services.AddSingleton<IHostedService>(provider =>
@@ -710,8 +716,8 @@ public static class ServiceCollectionExtensions
                 routingKey: routingKey,
                 queueName: integrationQueueName,
                 retryQueueName: integrationRetryQueueName,
-                deadLetterQueueName: integrationDeadLetterQueueName,
-                globalSettings: globalSettings,
+                maxRetries: maxRetries,
+                rabbitMqService: provider.GetRequiredService<IRabbitMqService>(),
                 logger: provider.GetRequiredService<ILogger<RabbitMqIntegrationListenerService>>()));
 
         return services;
@@ -724,6 +730,8 @@ public static class ServiceCollectionExtensions
             return services;
         }
 
+        services.AddSingleton<IRabbitMqService, RabbitMqService>();
+        services.AddSingleton<IEventIntegrationPublisher, RabbitMqService>();
         services.AddRabbitMqEventRepositoryListener(globalSettings);
 
         services.AddSlackService(globalSettings);
@@ -731,18 +739,16 @@ public static class ServiceCollectionExtensions
             globalSettings.EventLogging.RabbitMq.SlackEventsQueueName,
             globalSettings.EventLogging.RabbitMq.SlackIntegrationQueueName,
             globalSettings.EventLogging.RabbitMq.SlackIntegrationRetryQueueName,
-            globalSettings.EventLogging.RabbitMq.IntegrationDeadLetterQueueName,
-            IntegrationType.Slack,
-            globalSettings);
+            globalSettings.EventLogging.RabbitMq.MaxRetries,
+            IntegrationType.Slack);
 
         services.AddHttpClient(WebhookIntegrationHandler.HttpClientName);
         services.AddRabbitMqIntegration<WebhookIntegrationConfigurationDetails, WebhookIntegrationHandler>(
             globalSettings.EventLogging.RabbitMq.WebhookEventsQueueName,
             globalSettings.EventLogging.RabbitMq.WebhookIntegrationQueueName,
             globalSettings.EventLogging.RabbitMq.WebhookIntegrationRetryQueueName,
-            globalSettings.EventLogging.RabbitMq.IntegrationDeadLetterQueueName,
-            IntegrationType.Webhook,
-            globalSettings);
+            globalSettings.EventLogging.RabbitMq.MaxRetries,
+            IntegrationType.Webhook);
 
         return services;
     }