diff --git a/.pubnub.yml b/.pubnub.yml
index a8fd2231..5c6f1a18 100644
--- a/.pubnub.yml
+++ b/.pubnub.yml
@@ -1,9 +1,14 @@
 ---
 name: swift
 scm: github.com/pubnub/swift
-version: "8.0.1"
+version: "8.1.0"
 schema: 1
 changelog:
+  - date: 2024-11-18
+    version: 8.1.0
+    changes:
+      - type: feature
+        text: "Add custom message type support for the following APIs: publish, signal, share file, subscribe, and history."
   - date: 2024-10-17
     version: 8.0.1
     changes:
@@ -591,16 +596,16 @@ sdks:
           - distribution-type: source
             distribution-repository: GitHub release
             package-name: PubNub
-            location: https://github.com/pubnub/swift/archive/refs/tags/8.0.1.zip
+            location: https://github.com/pubnub/swift/archive/refs/tags/8.1.0.zip
             supported-platforms:
               supported-operating-systems:
                 macOS:
                   runtime-version:
                     - Swift 5.x
                   minimum-os-version:
-                    - OS X 10.11
+                    - macOS 10.15
                   maximum-os-version:
-                    - macOS 11.4
+                    - macOS 15.0.1
                   target-architecture:
                     - arm64
                     - x86_64
@@ -608,12 +613,11 @@ sdks:
                   runtime-version:
                     - Swift 5.x
                   minimum-os-version:
-                    - iOS 9.0
+                    - iOS 12.0
                   maximum-os-version:
-                    - iOS 14.6
+                    - iOS 18.0.1
                   target-architecture:
                     - arm64
-                    - armv7
                   target-devices:
                     - iPhone
                     - iPad
@@ -621,9 +625,9 @@ sdks:
                   runtime-version:
                     - Swift 5.x
                   minimum-os-version:
-                    - tvOS 10.0
+                    - tvOS 12.0
                   maximum-os-version:
-                    - tvOS 14.6
+                    - tvOS 18.0
                   target-architecture:
                     - arm64
                   target-devices:
@@ -632,10 +636,11 @@ sdks:
                   runtime-version:
                     - Swift 5.x
                   minimum-os-version:
-                    - watchOS 2.0
+                    - watchOS 4.0
                   maximum-os-version:
-                    - watchOS 7.5
+                    - watchOS 12.0
                   target-architecture:
+                    - arm64
                     - armv7k
                     - arm64_32
                   target-devices:
@@ -659,9 +664,9 @@ sdks:
                   runtime-version:
                     - Swift 5.x
                   minimum-os-version:
-                    - OS X 10.11
+                    - macOS 10.15
                   maximum-os-version:
-                    - macOS 11.4
+                    - macOS 15.0.1
                   target-architecture:
                     - arm64
                     - x86_64
@@ -669,12 +674,11 @@ sdks:
                   runtime-version:
                     - Swift 5.x
                   minimum-os-version:
-                    - iOS 9.0
+                    - iOS 12.0
                   maximum-os-version:
-                    - iOS 14.6
+                    - iOS 18.0.1
                   target-architecture:
                     - arm64
-                    - armv7
                   target-devices:
                     - iPhone
                     - iPad
@@ -682,9 +686,9 @@ sdks:
                   runtime-version:
                     - Swift 5.x
                   minimum-os-version:
-                    - tvOS 10.0
+                    - tvOS 12.0
                   maximum-os-version:
-                    - tvOS 14.6
+                    - tvOS 18.0
                   target-architecture:
                     - arm64
                   target-devices:
@@ -693,12 +697,13 @@ sdks:
                   runtime-version:
                     - Swift 5.x
                   minimum-os-version:
-                    - watchOS 2.0
+                    - watchOS 4.0
                   maximum-os-version:
-                    - watchOS 7.5
+                    - watchOS 12.0
                   target-architecture:
                     - armv7k
                     - arm64_32
+                    - arm64
                   target-devices:
                     - Apple Watch
           - distribution-type: package
@@ -711,9 +716,9 @@ sdks:
                   runtime-version:
                     - Swift 5.x
                   minimum-os-version:
-                    - OS X 10.11
+                    - macOS 10.15
                   maximum-os-version:
-                    - macOS 11.4
+                    - macOS 15.0.1
                   target-architecture:
                     - arm64
                     - x86_64
@@ -721,9 +726,9 @@ sdks:
                   runtime-version:
                     - Swift 5.x
                   minimum-os-version:
-                    - iOS 9.0
+                    - iOS 14.0
                   maximum-os-version:
-                    - iOS 14.6
+                    - iOS 18.0.1
                   target-architecture:
                     - arm64
                     - armv7
@@ -734,9 +739,9 @@ sdks:
                   runtime-version:
                     - Swift 5.x
                   minimum-os-version:
-                    - tvOS 10.0
+                    - tvOS 12.0
                   maximum-os-version:
-                    - tvOS 14.6
+                    - tvOS 18.0
                   target-architecture:
                     - arm64
                   target-devices:
@@ -745,18 +750,19 @@ sdks:
                   runtime-version:
                     - Swift 5.x
                   minimum-os-version:
-                    - watchOS 2.0
+                    - watchOS 4.0
                   maximum-os-version:
-                    - watchOS 7.5
+                    - watchOS 12.0
                   target-architecture:
                     - armv7k
                     - arm64_32
+                    - arm64
                   target-devices:
                     - Apple Watch
 supported-platforms:
   - version: PubNub Swift SDK
     platforms:
-      - iOS 9.0 or higher
-      - macOS 10.11 or higher
-      - tvOS 9.0 or higher
-      - watchOS 2.0 or higher
+      - iOS 14.0 or higher
+      - macOS 10.15 or higher
+      - tvOS 12.0 or higher
+      - watchOS 4.0 or higher
diff --git a/PubNub.xcodeproj/project.pbxproj b/PubNub.xcodeproj/project.pbxproj
index 5a1b7a0a..bee3ba8c 100644
--- a/PubNub.xcodeproj/project.pbxproj
+++ b/PubNub.xcodeproj/project.pbxproj
@@ -3995,7 +3995,7 @@
 					"@loader_path/Frameworks",
 				);
 				MACOSX_DEPLOYMENT_TARGET = 10.15;
-				MARKETING_VERSION = 8.0.1;
+				MARKETING_VERSION = 8.1.0;
 				MODULE_VERIFIER_SUPPORTED_LANGUAGE_STANDARDS = "gnu11 gnu++17";
 				MTL_ENABLE_DEBUG_INFO = INCLUDE_SOURCE;
 				MTL_FAST_MATH = YES;
@@ -4046,7 +4046,7 @@
 					"@loader_path/Frameworks",
 				);
 				MACOSX_DEPLOYMENT_TARGET = 10.15;
-				MARKETING_VERSION = 8.0.1;
+				MARKETING_VERSION = 8.1.0;
 				MODULE_VERIFIER_SUPPORTED_LANGUAGE_STANDARDS = "gnu11 gnu++17";
 				MTL_ENABLE_DEBUG_INFO = NO;
 				MTL_FAST_MATH = YES;
@@ -4154,7 +4154,7 @@
 					"@loader_path/Frameworks",
 				);
 				MACOSX_DEPLOYMENT_TARGET = 10.15;
-				MARKETING_VERSION = 8.0.1;
+				MARKETING_VERSION = 8.1.0;
 				MODULE_VERIFIER_SUPPORTED_LANGUAGE_STANDARDS = "gnu11 gnu++17";
 				MTL_ENABLE_DEBUG_INFO = INCLUDE_SOURCE;
 				MTL_FAST_MATH = YES;
@@ -4207,7 +4207,7 @@
 					"@loader_path/Frameworks",
 				);
 				MACOSX_DEPLOYMENT_TARGET = 10.15;
-				MARKETING_VERSION = 8.0.1;
+				MARKETING_VERSION = 8.1.0;
 				MODULE_VERIFIER_SUPPORTED_LANGUAGE_STANDARDS = "gnu11 gnu++17";
 				MTL_ENABLE_DEBUG_INFO = NO;
 				MTL_FAST_MATH = YES;
@@ -4328,7 +4328,7 @@
 					"@loader_path/Frameworks",
 				);
 				MACOSX_DEPLOYMENT_TARGET = 10.15;
-				MARKETING_VERSION = 8.0.1;
+				MARKETING_VERSION = 8.1.0;
 				MODULE_VERIFIER_SUPPORTED_LANGUAGE_STANDARDS = "gnu11 gnu++17";
 				MTL_ENABLE_DEBUG_INFO = INCLUDE_SOURCE;
 				MTL_FAST_MATH = YES;
@@ -4380,7 +4380,7 @@
 					"@loader_path/Frameworks",
 				);
 				MACOSX_DEPLOYMENT_TARGET = 10.15;
-				MARKETING_VERSION = 8.0.1;
+				MARKETING_VERSION = 8.1.0;
 				MODULE_VERIFIER_SUPPORTED_LANGUAGE_STANDARDS = "gnu11 gnu++17";
 				MTL_ENABLE_DEBUG_INFO = NO;
 				MTL_FAST_MATH = YES;
@@ -4860,7 +4860,7 @@
 					"$(TOOLCHAIN_DIR)/usr/lib/swift/macosx",
 				);
 				MACOSX_DEPLOYMENT_TARGET = 10.15;
-				MARKETING_VERSION = 8.0.1;
+				MARKETING_VERSION = 8.1.0;
 				MODULE_VERIFIER_SUPPORTED_LANGUAGE_STANDARDS = "gnu17 gnu++14";
 				OTHER_CFLAGS = "$(inherited)";
 				OTHER_LDFLAGS = "$(inherited)";
@@ -4903,7 +4903,7 @@
 					"$(TOOLCHAIN_DIR)/usr/lib/swift/macosx",
 				);
 				MACOSX_DEPLOYMENT_TARGET = 10.15;
-				MARKETING_VERSION = 8.0.1;
+				MARKETING_VERSION = 8.1.0;
 				MODULE_VERIFIER_SUPPORTED_LANGUAGE_STANDARDS = "gnu17 gnu++14";
 				OTHER_CFLAGS = "$(inherited)";
 				OTHER_LDFLAGS = "$(inherited)";
diff --git a/PubNubSwift.podspec b/PubNubSwift.podspec
index b96bf615..d32f5f39 100644
--- a/PubNubSwift.podspec
+++ b/PubNubSwift.podspec
@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name     = 'PubNubSwift'
-  s.version  = '8.0.1'
+  s.version  = '8.1.0'
   s.homepage = 'https://github.com/pubnub/swift'
   s.documentation_url = 'https://www.pubnub.com/docs/swift-native/pubnub-swift-sdk'
   s.authors = { 'PubNub, Inc.' => 'support@pubnub.com' }
diff --git a/Sources/PubNub/APIs/File+PubNub.swift b/Sources/PubNub/APIs/File+PubNub.swift
index 17ce8ef1..d0c86733 100644
--- a/Sources/PubNub/APIs/File+PubNub.swift
+++ b/Sources/PubNub/APIs/File+PubNub.swift
@@ -80,6 +80,8 @@ public extension PubNub {
   struct PublishFileRequest {
     /// The optional message that will be include alongside the File information
     public var additionalMessage: JSONCodable?
+    /// A user-provided custom message type
+    public var customMessageType: String?
     /// If true the published message is stored in history.
     public var store: Bool?
     /// Set a per message time to live in storage.
@@ -92,18 +94,21 @@ public extension PubNub {
     /// Default init
     /// - Parameters:
     ///   - additionalMessage: The optional message that will be include alongside the File information
-    ///   - store: If true the published message is stored in history.
-    ///   - ttl: Set a per message time to live in storage.
+    ///   - customMessageType: A user-provided custom message type
+    ///   - store: If true the published message is stored in history
+    ///   - ttl: Set a per message time to live in storage
     ///   - meta: Additional metadata to publish alongside the file
     ///   - customRequestConfig: Custom configuration overrides for this request
     public init(
       additionalMessage: JSONCodable? = nil,
+      customMessageType: String? = nil,
       store: Bool? = nil,
       ttl: Int? = nil,
       meta: JSONCodable? = nil,
       customRequestConfig: RequestConfiguration = RequestConfiguration()
     ) {
       self.additionalMessage = additionalMessage
+      self.customMessageType = customMessageType
       self.store = store
       self.ttl = ttl
       self.meta = meta
@@ -222,7 +227,7 @@ public extension PubNub {
 
     let router = PublishRouter(
       .file(
-        message: fileMessage,
+        message: fileMessage, customMessageType: request.customMessageType,
         shouldStore: request.store, ttl: request.ttl, meta: request.meta?.codableValue
       ),
       configuration: configuration
diff --git a/Sources/PubNub/Helpers/Constants.swift b/Sources/PubNub/Helpers/Constants.swift
index a1830812..1f60a8f6 100644
--- a/Sources/PubNub/Helpers/Constants.swift
+++ b/Sources/PubNub/Helpers/Constants.swift
@@ -57,7 +57,7 @@ public enum Constant {
 
   static let pubnubSwiftSDKName: String = "PubNubSwift"
 
-  static let pubnubSwiftSDKVersion: String = "8.0.1"
+  static let pubnubSwiftSDKVersion: String = "8.1.0"
 
   static let appBundleId: String = {
     if let info = Bundle.main.infoDictionary,
diff --git a/Sources/PubNub/Models/PubNubMessage.swift b/Sources/PubNub/Models/PubNubMessage.swift
index dcf6c92c..9f1a9752 100644
--- a/Sources/PubNub/Models/PubNubMessage.swift
+++ b/Sources/PubNub/Models/PubNubMessage.swift
@@ -16,7 +16,6 @@ public enum PubNubMessageType: Int, Codable, Hashable {
   case object = 2
   case messageAction = 3
   case file = 4
-
   case unknown = 999
 }
 
@@ -38,6 +37,8 @@ public protocol PubNubMessage {
   var metadata: JSONCodable? { get set }
   /// The type of message that was received
   var messageType: PubNubMessageType { get set }
+  /// A user-provided custom message type
+  var customMessageType: String? { get set }
   /// An error (if any) occured while getting this message
   var error: PubNubError? { get set }
 
@@ -76,6 +77,7 @@ public struct PubNubMessageBase: PubNubMessage, Codable, Hashable {
   public var subscription: String?
   public var published: Timetoken
   public var messageType: PubNubMessageType
+  public var customMessageType: String?
   public var error: PubNubError?
 
   var concretePayload: AnyJSON
@@ -112,6 +114,7 @@ public struct PubNubMessageBase: PubNubMessage, Codable, Hashable {
       subscription: other.subscription,
       published: other.published,
       metadata: other.metadata?.codableValue,
+      customMessageType: other.customMessageType,
       messageType: other.messageType,
       error: other.error
     )
@@ -126,6 +129,7 @@ public struct PubNubMessageBase: PubNubMessage, Codable, Hashable {
       subscription: subscribe.subscription,
       published: subscribe.publishTimetoken.timetoken,
       metadata: subscribe.metadata,
+      customMessageType: subscribe.customMessageType,
       messageType: subscribe.messageType.asPubNubMessageType,
       error: subscribe.error
     )
@@ -146,7 +150,8 @@ public struct PubNubMessageBase: PubNubMessage, Codable, Hashable {
       subscription: nil,
       published: history.timetoken,
       metadata: history.meta,
-      messageType: history.messageType ?? .unknown,
+      customMessageType: history.customMessageType,
+      messageType: history.messageType?.asPubNubMessageType ?? .unknown,
       error: history.error
     )
   }
@@ -159,6 +164,7 @@ public struct PubNubMessageBase: PubNubMessage, Codable, Hashable {
     subscription: String?,
     published: Timetoken,
     metadata: AnyJSON?,
+    customMessageType: String? = nil,
     messageType: PubNubMessageType = .unknown,
     error: PubNubError? = nil
   ) {
@@ -170,6 +176,7 @@ public struct PubNubMessageBase: PubNubMessage, Codable, Hashable {
     self.published = published
     self.concreteMetadata = metadata
     self.messageType = messageType
+    self.customMessageType = customMessageType
     self.error = error
   }
 
@@ -184,6 +191,7 @@ public struct PubNubMessageBase: PubNubMessage, Codable, Hashable {
     try container.encode(self.published, forKey: .published)
     try container.encodeIfPresent(self.concreteMetadata, forKey: .concreteMetadata)
     try container.encode(self.messageType, forKey: .messageType)
+    try container.encode(self.customMessageType, forKey: .customMessageType)
   }
 
   enum CodingKeys: CodingKey {
@@ -195,6 +203,7 @@ public struct PubNubMessageBase: PubNubMessage, Codable, Hashable {
     case published
     case concreteMetadata
     case messageType
+    case customMessageType
   }
 
   public init(from decoder: Decoder) throws {
@@ -208,6 +217,7 @@ public struct PubNubMessageBase: PubNubMessage, Codable, Hashable {
     self.published = try container.decode(Timetoken.self, forKey: .published)
     self.concreteMetadata = try container.decodeIfPresent(AnyJSON.self, forKey: .concreteMetadata)
     self.messageType = try container.decode(PubNubMessageType.self, forKey: .messageType)
+    self.customMessageType = try container.decodeIfPresent(String.self, forKey: .customMessageType)
   }
 }
 
diff --git a/Sources/PubNub/Networking/HTTPRouter.swift b/Sources/PubNub/Networking/HTTPRouter.swift
index 7b70d043..c03c8b6d 100644
--- a/Sources/PubNub/Networking/HTTPRouter.swift
+++ b/Sources/PubNub/Networking/HTTPRouter.swift
@@ -104,6 +104,7 @@ enum QueryKey: String {
   case remove
   case add
   case type
+  case customMessageType = "custom_message_type"
   case start
   case end
   case channel
@@ -111,6 +112,7 @@ enum QueryKey: String {
   case max
   case includeMeta = "include_meta"
   case includeMessageType = "include_message_type"
+  case includeCustomMessageType = "include_custom_message_type"
   case includeUUID = "include_uuid"
   case timetoken
   case channelsTimetoken
diff --git a/Sources/PubNub/Networking/Routers/HistoryRouter.swift b/Sources/PubNub/Networking/Routers/HistoryRouter.swift
index cabafc7c..4a5b7efb 100644
--- a/Sources/PubNub/Networking/Routers/HistoryRouter.swift
+++ b/Sources/PubNub/Networking/Routers/HistoryRouter.swift
@@ -17,11 +17,11 @@ struct HistoryRouter: HTTPRouter {
   enum Endpoint: CustomStringConvertible {
     case fetch(
       channels: [String], max: Int?, start: Timetoken?, end: Timetoken?,
-      includeMeta: Bool, includeMessageType: Bool, includeUUID: Bool
+      includeMeta: Bool, includeMessageType: Bool, includeCustomMessageType: Bool, includeUUID: Bool
     )
     case fetchWithActions(
       channel: String, max: Int?, start: Timetoken?, end: Timetoken?,
-      includeMeta: Bool, includeMessageType: Bool, includeUUID: Bool
+      includeMeta: Bool, includeMessageType: Bool, includeCustomMessageType: Bool, includeUUID: Bool
     )
     case delete(channel: String, start: Timetoken?, end: Timetoken?)
     case messageCounts(channels: [String], timetoken: Timetoken?, channelsTimetoken: [Timetoken]?)
@@ -41,9 +41,9 @@ struct HistoryRouter: HTTPRouter {
 
     var firstChannel: String? {
       switch self {
-      case let .fetchWithActions(channel, _, _, _, _, _, _):
+      case let .fetchWithActions(channel, _, _, _, _, _, _, _):
         return channel
-      case let .fetch(channels, _, _, _, _, _, _):
+      case let .fetch(channels, _, _, _, _, _, _, _):
         return channels.first
       case let .delete(channel, _, _):
         return channel
@@ -75,9 +75,9 @@ struct HistoryRouter: HTTPRouter {
     let path: String
 
     switch endpoint {
-    case let .fetchWithActions(channel, _, _, _, _, _, _):
+    case let .fetchWithActions(channel, _, _, _, _, _, _, _):
       path = "/v3/history-with-actions/sub-key/\(subscribeKey)/channel/\(channel)"
-    case let .fetch(channels, _, _, _, _, _, _):
+    case let .fetch(channels, _, _, _, _, _, _, _):
       path = "/v3/history/sub-key/\(subscribeKey)/channel/\(channels.csvString.urlEncodeSlash)"
     case let .delete(channel, _, _):
       path = "/v3/history/sub-key/\(subscribeKey)/channel/\(channel.urlEncodeSlash)"
@@ -91,27 +91,28 @@ struct HistoryRouter: HTTPRouter {
     var query = defaultQueryItems
 
     switch endpoint {
-    case let .fetchWithActions(_, max, start, end, includeMeta, includeMessageType, includeUUID):
+    case let .fetchWithActions(_, max, start, end, includeMeta, includeMessageType, includeCustomMessageType, includeUUID):
       query.appendIfPresent(key: .max, value: max?.description)
       query.appendIfPresent(key: .start, value: start?.description)
       query.appendIfPresent(key: .end, value: end?.description)
       query.appendIfPresent(key: .includeMeta, value: includeMeta.description)
       query.appendIfPresent(key: .includeMessageType, value: includeMessageType.description)
+      query.appendIfPresent(key: .includeCustomMessageType, value: includeCustomMessageType.description)
       query.appendIfPresent(key: .includeUUID, value: includeUUID.description)
-    case let .fetch(_, max, start, end, includeMeta, includeMessageType, includeUUID):
+    case let .fetch(_, max, start, end, includeMeta, includeMessageType, includeCustomMessageType, includeUUID):
       query.appendIfPresent(key: .max, value: max?.description)
       query.appendIfPresent(key: .start, value: start?.description)
       query.appendIfPresent(key: .end, value: end?.description)
       query.appendIfPresent(key: .includeMeta, value: includeMeta.description)
       query.appendIfPresent(key: .includeMessageType, value: includeMessageType.description)
+      query.appendIfPresent(key: .includeCustomMessageType, value: includeCustomMessageType.description)
       query.appendIfPresent(key: .includeUUID, value: includeUUID.description)
     case let .delete(_, startTimetoken, endTimetoken):
       query.appendIfPresent(key: .start, value: startTimetoken?.description)
       query.appendIfPresent(key: .end, value: endTimetoken?.description)
     case let .messageCounts(_, timetoken, channelsTimetoken):
       query.appendIfPresent(key: .timetoken, value: timetoken?.description)
-      query.appendIfPresent(key: .channelsTimetoken,
-                            value: channelsTimetoken?.map { $0.description }.csvString)
+      query.appendIfPresent(key: .channelsTimetoken, value: channelsTimetoken?.map { $0.description }.csvString)
     }
 
     return .success(query)
@@ -129,9 +130,9 @@ struct HistoryRouter: HTTPRouter {
   // Validated
   var validationErrorDetail: String? {
     switch endpoint {
-    case let .fetchWithActions(channel, _, _, _, _, _, _):
+    case let .fetchWithActions(channel, _, _, _, _, _, _, _):
       return isInvalidForReason((channel.isEmpty, ErrorDescription.emptyChannelString))
-    case let .fetch(channels, _, _, _, _, _, _):
+    case let .fetch(channels, _, _, _, _, _, _, _):
       return isInvalidForReason((channels.isEmpty, ErrorDescription.emptyChannelArray))
     case let .delete(channel, _, _):
       return isInvalidForReason((channel.isEmpty, ErrorDescription.emptyChannelString))
@@ -152,16 +153,15 @@ struct MessageHistoryResponseDecoder: ResponseDecoder {
   func decode(response: EndpointResponse<Data>) -> Result<EndpointResponse<MessageHistoryResponse>, Error> {
     do {
       // Version3
-      let payload = try Constant.jsonDecoder.decode(MessageHistoryResponse.self, from: response.payload)
-      let decodedResponse = EndpointResponse<MessageHistoryResponse>(router: response.router,
-                                                                     request: response.request,
-                                                                     response: response.response,
-                                                                     data: response.data,
-                                                                     payload: payload)
-
-      // Attempt to decode message response
-
-      return .success(decodedResponse)
+      return .success(
+        EndpointResponse<MessageHistoryResponse>(
+          router: response.router,
+          request: response.request,
+          response: response.response,
+          data: response.data,
+          payload: try Constant.jsonDecoder.decode(MessageHistoryResponse.self, from: response.payload)
+        )
+      )
     } catch {
       return .failure(PubNubError(.jsonDataDecodingFailure, response: response, error: error))
     }
@@ -191,6 +191,7 @@ struct MessageHistoryResponseDecoder: ResponseDecoder {
               meta: message.meta,
               uuid: message.uuid,
               messageType: message.messageType,
+              customMessageType: message.customMessageType,
               error: nil
             )
           case .failure(let error):
@@ -200,6 +201,7 @@ struct MessageHistoryResponseDecoder: ResponseDecoder {
               meta: message.meta,
               uuid: message.uuid,
               messageType: message.messageType,
+              customMessageType: message.customMessageType,
               error: error
             )
             PubNub.log.warn("History message failed to decrypt due to \(error)")
@@ -211,6 +213,7 @@ struct MessageHistoryResponseDecoder: ResponseDecoder {
             meta: message.meta,
             uuid: message.uuid,
             messageType: message.messageType,
+            customMessageType: message.customMessageType,
             error: PubNubError(
               .decryptionFailure,
               additional: ["Cannot decrypt message due to invalid Base-64 input"]
@@ -223,15 +226,18 @@ struct MessageHistoryResponseDecoder: ResponseDecoder {
     }
 
     // Replace previous payload with decrypted one
-    let decryptedPayload = MessageHistoryResponse(status: response.payload.status,
-                                                  error: response.payload.error,
-                                                  errorMessage: response.payload.errorMessage,
-                                                  channels: channels)
-    let decryptedResponse = EndpointResponse<MessageHistoryResponse>(router: response.router,
-                                                                     request: response.request,
-                                                                     response: response.response,
-                                                                     data: response.data,
-                                                                     payload: decryptedPayload)
+    let decryptedResponse = EndpointResponse<MessageHistoryResponse>(
+      router: response.router,
+      request: response.request,
+      response: response.response,
+      data: response.data,
+      payload: MessageHistoryResponse(
+        status: response.payload.status,
+        error: response.payload.error,
+        errorMessage: response.payload.errorMessage,
+        channels: channels
+      )
+    )
     return .success(decryptedResponse)
   }
 }
@@ -299,12 +305,14 @@ struct MessageHistoryMessagePayload: Codable {
   typealias ActionType = String
   typealias ActionValue = String
   typealias RawMessageAction = [ActionType: [ActionValue: [MessageHistoryMessageAction]]]
+  typealias LegacyPubNubMessageType = SubscribeMessagePayload.Action
 
   let message: AnyJSON
   let timetoken: Timetoken
   let meta: AnyJSON?
   let uuid: String?
-  let messageType: PubNubMessageType?
+  let messageType: LegacyPubNubMessageType?
+  let customMessageType: String?
   let actions: RawMessageAction
   let error: PubNubError?
 
@@ -313,7 +321,8 @@ struct MessageHistoryMessagePayload: Codable {
     timetoken: Timetoken = 0,
     meta: JSONCodable? = nil,
     uuid: String?,
-    messageType: PubNubMessageType?,
+    messageType: LegacyPubNubMessageType?,
+    customMessageType: String? = nil,
     actions: RawMessageAction = [:],
     error: PubNubError?
   ) {
@@ -321,6 +330,7 @@ struct MessageHistoryMessagePayload: Codable {
     self.timetoken = timetoken
     self.uuid = uuid
     self.messageType = messageType
+    self.customMessageType = customMessageType
     self.meta = meta?.codableValue
     self.actions = actions
     self.error = error
@@ -332,6 +342,7 @@ struct MessageHistoryMessagePayload: Codable {
     case meta
     case uuid
     case messageType = "message_type"
+    case customMessageType = "custom_message_type"
     case actions
   }
 
@@ -341,9 +352,10 @@ struct MessageHistoryMessagePayload: Codable {
     message = try container.decode(AnyJSON.self, forKey: .message)
     meta = try container.decodeIfPresent(AnyJSON.self, forKey: .meta)
     uuid = try container.decodeIfPresent(String.self, forKey: .uuid)
-    messageType = try container.decodeIfPresent(PubNubMessageType.self, forKey: .messageType)
     timetoken = Timetoken(try container.decode(String.self, forKey: .timetoken)) ?? 0
     actions = try container.decodeIfPresent(RawMessageAction.self, forKey: .actions) ?? [:]
+    messageType = try container.decodeIfPresent(LegacyPubNubMessageType.self, forKey: .messageType) ?? .message
+    customMessageType = try container.decodeIfPresent(String.self, forKey: .customMessageType)
     error = nil
   }
 
@@ -354,8 +366,9 @@ struct MessageHistoryMessagePayload: Codable {
     try container.encode(timetoken.description, forKey: .timetoken)
     try container.encodeIfPresent(meta, forKey: .meta)
     try container.encodeIfPresent(uuid, forKey: .uuid)
-    try container.encodeIfPresent(messageType, forKey: .messageType)
     try container.encode(actions, forKey: .actions)
+    try container.encodeIfPresent(messageType, forKey: .messageType)
+    try container.encodeIfPresent(customMessageType, forKey: .customMessageType)
   }
 }
 
diff --git a/Sources/PubNub/Networking/Routers/PublishRouter.swift b/Sources/PubNub/Networking/Routers/PublishRouter.swift
index b7246b75..f2d7a5be 100644
--- a/Sources/PubNub/Networking/Routers/PublishRouter.swift
+++ b/Sources/PubNub/Networking/Routers/PublishRouter.swift
@@ -15,11 +15,33 @@ import Foundation
 struct PublishRouter: HTTPRouter {
   // Nested Endpoint
   enum Endpoint: CustomStringConvertible {
-    case publish(message: AnyJSON, channel: String, shouldStore: Bool?, ttl: Int?, meta: AnyJSON?)
-    case compressedPublish(message: AnyJSON, channel: String, shouldStore: Bool?, ttl: Int?, meta: AnyJSON?)
-    case fire(message: AnyJSON, channel: String, meta: AnyJSON?)
-    case signal(message: AnyJSON, channel: String)
-    case file(message: FilePublishPayload, shouldStore: Bool?, ttl: Int?, meta: AnyJSON?)
+    case publish(
+      message: AnyJSON, channel: String,
+      customMessageType: String?, shouldStore: Bool?,
+      ttl: Int?, meta: AnyJSON?
+    )
+    case compressedPublish(
+      message: AnyJSON, channel: String,
+      customMessageType: String?, shouldStore: Bool?,
+      ttl: Int?, meta: AnyJSON?
+    )
+    case fire(
+      message: AnyJSON,
+      channel: String,
+      meta: AnyJSON?
+    )
+    case signal(
+      message: AnyJSON,
+      channel: String,
+      customMessageType: String?
+    )
+    case file(
+      message: FilePublishPayload,
+      customMessageType: String?,
+      shouldStore: Bool?,
+      ttl: Int?,
+      meta: AnyJSON?
+    )
 
     var description: String {
       switch self {
@@ -57,20 +79,19 @@ struct PublishRouter: HTTPRouter {
 
   var path: Result<String, Error> {
     switch endpoint {
-    case let .publish(message, channel, _, _, _):
-      return append(message: message,
-                    to: "/publish/\(publishKey)/\(subscribeKey)/0/\(channel.urlEncodeSlash)/0/")
+    case let .publish(message, channel, _, _, _, _):
+      return append(message: message, to: "/publish/\(publishKey)/\(subscribeKey)/0/\(channel.urlEncodeSlash)/0/")
     case let .fire(message, channel, _):
-      return append(message: message,
-                    to: "/publish/\(publishKey)/\(subscribeKey)/0/\(channel.urlEncodeSlash)/0/")
-    case let .compressedPublish(_, channel, _, _, _):
+      return append(message: message, to: "/publish/\(publishKey)/\(subscribeKey)/0/\(channel.urlEncodeSlash)/0/")
+    case let .compressedPublish(_, channel, _, _, _, _):
       return .success("/publish/\(publishKey)/\(subscribeKey)/0/\(channel.urlEncodeSlash)/0")
-    case let .signal(message, channel):
-      return append(message: message,
-                    to: "/signal/\(publishKey)/\(subscribeKey)/0/\(channel.urlEncodeSlash)/0/")
-    case let .file(message, _, _, _):
-      return append(message: message,
-                    to: "/v1/files/publish-file/\(publishKey)/\(subscribeKey)/0/\(message.channel.urlEncodeSlash)/0/")
+    case let .signal(message, channel, _):
+      return append(message: message, to: "/signal/\(publishKey)/\(subscribeKey)/0/\(channel.urlEncodeSlash)/0/")
+    case let .file(message, _, _, _, _):
+      return append(
+        message: message,
+        to: "/v1/files/publish-file/\(publishKey)/\(subscribeKey)/0/\(message.channel.urlEncodeSlash)/0/"
+      )
     }
   }
 
@@ -88,24 +109,29 @@ struct PublishRouter: HTTPRouter {
     var query = defaultQueryItems
 
     switch endpoint {
-    case let .publish(_, _, shouldStore, ttl, meta):
-      return parsePublish(query: &query, store: shouldStore, ttl: ttl, meta: meta)
-    case let .compressedPublish(_, _, shouldStore, ttl, meta):
-      return parsePublish(query: &query, store: shouldStore, ttl: ttl, meta: meta)
+    case let .publish(_, _, customMessageType, shouldStore, ttl, meta):
+      return parsePublish(query: &query, customMessageType: customMessageType, store: shouldStore, ttl: ttl, meta: meta)
+    case let .compressedPublish(_, _, customMessageType, shouldStore, ttl, meta):
+      return parsePublish(query: &query, customMessageType: customMessageType, store: shouldStore, ttl: ttl, meta: meta)
     case let .fire(_, _, meta):
-      return parsePublish(query: &query, store: false, ttl: 0, meta: meta)
-    case .signal:
-      break
-    case let .file(_, shouldStore, ttl, meta):
-      return parsePublish(query: &query, store: shouldStore, ttl: ttl, meta: meta)
+      return parsePublish(query: &query, customMessageType: nil, store: false, ttl: 0, meta: meta)
+    case let .signal(_, _, customMessageType):
+      return parsePublish(query: &query, customMessageType: customMessageType, store: nil, ttl: nil, meta: nil)
+    case let .file(_, customMessageType, shouldStore, ttl, meta):
+      return parsePublish(query: &query, customMessageType: customMessageType, store: shouldStore, ttl: ttl, meta: meta)
     }
-
-    return .success(query)
   }
 
-  func parsePublish(query: inout [URLQueryItem], store: Bool?, ttl: Int?, meta: AnyJSON?) -> QueryResult {
+  func parsePublish(
+    query: inout [URLQueryItem],
+    customMessageType: String?,
+    store: Bool?,
+    ttl: Int?,
+    meta: AnyJSON?
+  ) -> QueryResult {
     query.appendIfPresent(key: .store, value: store?.stringNumber)
     query.appendIfPresent(key: .ttl, value: ttl?.description)
+    query.appendIfPresent(key: .customMessageType, value: customMessageType)
 
     if let meta = meta, !meta.isEmpty {
       return meta.jsonStringifyResult.map { json -> [URLQueryItem] in
@@ -127,7 +153,7 @@ struct PublishRouter: HTTPRouter {
 
   var body: Result<Data?, Error> {
     switch endpoint {
-    case let .compressedPublish(message, _, _, _, _):
+    case let .compressedPublish(message, _, _, _, _, _):
       if let cryptoModule = configuration.cryptoModule {
         return message.jsonStringifyResult.flatMap {
           cryptoModule.encrypt(string: $0)
@@ -152,12 +178,12 @@ struct PublishRouter: HTTPRouter {
 
   var validationErrorDetail: String? {
     switch endpoint {
-    case let .publish(message, channel, _, _, _):
+    case let .publish(message, channel, _, _, _, _):
       return isInvalidForReason(
         (message.isEmpty, ErrorDescription.emptyMessagePayload),
         (channel.isEmpty, ErrorDescription.emptyChannelString)
       )
-    case let .compressedPublish(message, channel, _, _, _):
+    case let .compressedPublish(message, channel, _, _, _, _):
       return isInvalidForReason(
         (message.isEmpty, ErrorDescription.emptyMessagePayload),
         (channel.isEmpty, ErrorDescription.emptyChannelString)
@@ -167,12 +193,12 @@ struct PublishRouter: HTTPRouter {
         (message.isEmpty, ErrorDescription.emptyMessagePayload),
         (channel.isEmpty, ErrorDescription.emptyChannelString)
       )
-    case let .signal(message, channel):
+    case let .signal(message, channel, _):
       return isInvalidForReason(
         (message.isEmpty, ErrorDescription.emptyMessagePayload),
         (channel.isEmpty, ErrorDescription.emptyChannelString)
       )
-    case let .file(message, _, _, _):
+    case let .file(message, _, _, _, _):
       return message.validationErrorDetail
     }
   }
diff --git a/Sources/PubNub/Networking/Routers/SubscribeRouter.swift b/Sources/PubNub/Networking/Routers/SubscribeRouter.swift
index 0f863c14..125d7a72 100644
--- a/Sources/PubNub/Networking/Routers/SubscribeRouter.swift
+++ b/Sources/PubNub/Networking/Routers/SubscribeRouter.swift
@@ -139,8 +139,14 @@ struct SubscribeDecoder: ResponseDecoder {
         if let timetokenResponse = try? Constant.jsonDecoder.decode(
           Payload.self, from: truncatedData
         ).cursor {
-          return .failure(PubNubError(.jsonDataDecodingFailure, response: response, error: error,
-                                      affected: [.subscribe(timetokenResponse)]))
+          return .failure(
+            PubNubError(
+              .jsonDataDecodingFailure,
+              response: response,
+              error: error,
+              affected: [.subscribe(timetokenResponse)]
+            )
+          )
         }
       }
 
@@ -276,6 +282,7 @@ public struct SubscribeMessagePayload: Codable, Hashable {
   public let subscription: String?
   public let channel: String
   public let messageType: Action
+  public var customMessageType: String?
   public var payload: AnyJSON
   public let flags: Int
   public let publisher: String?
@@ -291,6 +298,7 @@ public struct SubscribeMessagePayload: Codable, Hashable {
     case channel = "c"
     case payload = "d"
     case messageType = "e"
+    case customMessageType = "cmt"
     case flags = "f"
     case publisher = "i"
     case subscribeKey = "k"
@@ -332,6 +340,7 @@ public struct SubscribeMessagePayload: Codable, Hashable {
     subscription: String?,
     channel: String,
     messageType: Action,
+    customMessageType: String? = nil,
     payload: AnyJSON,
     flags: Int,
     publisher: String?,
@@ -345,6 +354,7 @@ public struct SubscribeMessagePayload: Codable, Hashable {
     self.subscription = subscription
     self.channel = channel
     self.messageType = messageType
+    self.customMessageType = customMessageType
     self.payload = payload
     self.flags = flags
     self.publisher = publisher
@@ -359,9 +369,7 @@ public struct SubscribeMessagePayload: Codable, Hashable {
     let container = try decoder.container(keyedBy: CodingKeys.self)
 
     shard = try container.decode(String.self, forKey: .shard)
-    subscription = try container
-      .decodeIfPresent(String.self, forKey: .subscription)?
-      .trimmingPresenceChannelSuffix
+    subscription = try container.decodeIfPresent(String.self, forKey: .subscription)?.trimmingPresenceChannelSuffix
     payload = try container.decode(AnyJSON.self, forKey: .payload)
     flags = try container.decode(Int.self, forKey: .flags)
     publisher = try container.decodeIfPresent(String.self, forKey: .publisher)
@@ -369,11 +377,12 @@ public struct SubscribeMessagePayload: Codable, Hashable {
     originTimetoken = try container.decodeIfPresent(SubscribeCursor.self, forKey: .originTimetoken)
     publishTimetoken = try container.decode(SubscribeCursor.self, forKey: .publishTimetoken)
     metadata = try container.decodeIfPresent(AnyJSON.self, forKey: .meta)
+    customMessageType = try container.decodeIfPresent(String.self, forKey: .customMessageType)
 
-    let messageType = try container.decodeIfPresent(Int.self, forKey: .messageType)
+    let pubNubMessageType = try container.decodeIfPresent(Int.self, forKey: .messageType)
     let fullChannel = try container.decode(String.self, forKey: .channel)
 
-    if let messageType = messageType, let action = Action(rawValue: messageType) {
+    if let pubNubMessageType = pubNubMessageType, let action = Action(rawValue: pubNubMessageType) {
       self.messageType = action
     } else {
       // If channel endswith -pnpres we assume it's a presence event
@@ -406,6 +415,8 @@ public struct SubscribeMessagePayload: Codable, Hashable {
     if messageType != .presence {
       try container.encode(messageType, forKey: .messageType)
     }
+
+    try container.encode(customMessageType, forKey: .customMessageType)
   }
   // swiftlint:disable:next file_length
 }
diff --git a/Sources/PubNub/PubNub.swift b/Sources/PubNub/PubNub.swift
index 300f07f4..ef0d77dd 100644
--- a/Sources/PubNub/PubNub.swift
+++ b/Sources/PubNub/PubNub.swift
@@ -205,8 +205,9 @@ public extension PubNub {
   /// 4. If `storeTTL` is not specified, then expiration of the message defaults back to the expiry value for the key.
   ///
   /// - Parameters:
-  ///   - channel: The destination of the message
-  ///   - message: The message to publish
+  ///   - channel: The destination of the message.
+  ///   - message: The message to publish.
+  ///   - customMessageType: Custom message type.
   ///   - shouldStore: If true the published message is stored in history.
   ///   - storeTTL: Set a per message time to live in storage.
   ///   - meta: Publish extra metadata with the request.
@@ -218,6 +219,7 @@ public extension PubNub {
   func publish(
     channel: String,
     message: JSONCodable,
+    customMessageType: String? = nil,
     shouldStore: Bool? = nil,
     storeTTL: Int? = nil,
     meta: JSONCodable? = nil,
@@ -231,6 +233,7 @@ public extension PubNub {
         .compressedPublish(
           message: message.codableValue,
           channel: channel,
+          customMessageType: customMessageType,
           shouldStore: shouldStore,
           ttl: storeTTL,
           meta: meta?.codableValue
@@ -242,6 +245,7 @@ public extension PubNub {
         .publish(
           message: message.codableValue,
           channel: channel,
+          customMessageType: customMessageType,
           shouldStore: shouldStore,
           ttl: storeTTL,
           meta: meta?.codableValue
@@ -305,6 +309,7 @@ public extension PubNub {
   /// - Parameters:
   ///   - channel: The destination of the message
   ///   - message: The message to publish
+  ///   - customMessageType: Custom signal type.
   ///   - custom: Custom configuration overrides for this request
   ///   - completion: The async `Result` of the method call
   ///     - **Success**: The `Timetoken` of the published Message
@@ -312,12 +317,13 @@ public extension PubNub {
   func signal(
     channel: String,
     message: JSONCodable,
+    customMessageType: String? = nil,
     custom requestConfig: RequestConfiguration = RequestConfiguration(),
     completion: ((Result<Timetoken, Error>) -> Void)?
   ) {
     route(
       PublishRouter(
-        .signal(message: message.codableValue, channel: channel),
+        .signal(message: message.codableValue, channel: channel, customMessageType: customMessageType),
         configuration: requestConfig.customConfiguration ?? configuration
       ),
       requestOperator: configuration.automaticRetry?.retryOperator(for: .messageSend),
@@ -1059,6 +1065,7 @@ public extension PubNub {
   ///   - includeMeta: If `true` the meta properties of messages will be included in the response
   ///   - includeUUID: If `true` the UUID of the message publisher will be included with each message in the response
   ///   - includeMessageType: If `true` the message type will be included with each message
+  ///   - includeCustomMessageType: If `true` the user-provided custom message type will be included with each message
   ///   - page: The paging object used for pagination
   ///   - custom: Custom configuration overrides for this request
   ///   - completion: The async `Result` of the method call
@@ -1066,8 +1073,11 @@ public extension PubNub {
   ///     - **Failure**: An `Error` describing the failure
   func fetchMessageHistory(
     for channels: [String],
-    includeActions: Bool = false, includeMeta: Bool = false,
-    includeUUID: Bool = true, includeMessageType: Bool = true,
+    includeActions: Bool = false,
+    includeMeta: Bool = false,
+    includeUUID: Bool = true,
+    includeMessageType: Bool = true,
+    includeCustomMessageType: Bool = false,
     page: PubNubBoundedPage? = PubNubBoundedPageBase(),
     custom requestConfig: RequestConfiguration = RequestConfiguration(),
     completion: ((Result<(messagesByChannel: [String: [PubNubMessage]], next: PubNubBoundedPage?), Error>) -> Void)?
@@ -1080,7 +1090,7 @@ public extension PubNub {
         .fetchWithActions(
           channel: channels.first ?? "",
           max: page?.limit ?? 25, start: page?.start, end: page?.end,
-          includeMeta: includeMeta, includeMessageType: includeMessageType,
+          includeMeta: includeMeta, includeMessageType: includeMessageType, includeCustomMessageType: includeCustomMessageType,
           includeUUID: includeUUID
         ),
         configuration: requestConfig.customConfiguration ?? configuration
@@ -1090,7 +1100,7 @@ public extension PubNub {
         .fetch(
           channels: channels, max: page?.limit ?? 100,
           start: page?.start, end: page?.end,
-          includeMeta: includeMeta, includeMessageType: includeMessageType,
+          includeMeta: includeMeta, includeMessageType: includeMessageType, includeCustomMessageType: includeCustomMessageType,
           includeUUID: includeUUID
         ),
         configuration: requestConfig.customConfiguration ?? configuration
@@ -1100,7 +1110,7 @@ public extension PubNub {
         .fetch(
           channels: channels, max: page?.limit ?? 25,
           start: page?.start, end: page?.end,
-          includeMeta: includeMeta, includeMessageType: includeMessageType,
+          includeMeta: includeMeta, includeMessageType: includeMessageType, includeCustomMessageType: includeCustomMessageType,
           includeUUID: includeUUID
         ),
         configuration: requestConfig.customConfiguration ?? configuration
diff --git a/Tests/PubNubContractTest/PubNubContractTestCase.swift b/Tests/PubNubContractTest/PubNubContractTestCase.swift
index bec9fba2..89bc86f8 100644
--- a/Tests/PubNubContractTest/PubNubContractTestCase.swift
+++ b/Tests/PubNubContractTest/PubNubContractTestCase.swift
@@ -18,10 +18,10 @@ let defaultSubscribeKey = "demo-36"
 let defaultPublishKey = "demo-36"
 
 @objc public class PubNubContractTestCase: XCTestCase {
-  
   fileprivate var listener: SubscriptionListener!
   
   public var messageReceivedHandler: ((PubNubMessage, [PubNubMessage]) -> Void)?
+  public var fileReceivedHandler: ((PubNubFileEvent, [PubNubFileEvent]) -> Void)?
   public var statusReceivedHandler: ((SubscriptionListener.StatusEvent, [SubscriptionListener.StatusEvent]) -> Void)?
   public var presenceChangeReceivedHandler: ((PubNubPresenceChange, [PubNubPresenceChange]) -> Void)?
 
@@ -29,11 +29,12 @@ let defaultPublishKey = "demo-36"
   fileprivate static var _receivedStatuses: [SubscriptionListener.StatusEvent] = []
   fileprivate static var _receivedMessages: [PubNubMessage] = []
   fileprivate static var _receivedPresenceChanges: [PubNubPresenceChange] = []
-
+  fileprivate static var _receivedFiles: [PubNubFileEvent] = []
   fileprivate static var _currentScenario: CCIScenarioDefinition?
   fileprivate static var _apiCallResults: [Any] = []
-  
   fileprivate static var _currentConfiguration = PubNubContractTestCase._defaultConfiguration
+  fileprivate static var currentClient: PubNub?
+
   fileprivate static var _defaultConfiguration: PubNubConfiguration {
     PubNubConfiguration(
       publishKey: defaultPublishKey,
@@ -44,8 +45,6 @@ let defaultPublishKey = "demo-36"
       supressLeaveEvents: true
     )
   }
-    
-  fileprivate static var currentClient: PubNub?
 
   public var configuration: PubNubConfiguration { PubNubContractTestCase._currentConfiguration }
 
@@ -74,6 +73,11 @@ let defaultPublishKey = "demo-36"
     set { PubNubContractTestCase._receivedMessages = newValue }
   }
   
+  public var receivedFiles: [PubNubFileEvent] {
+    get { PubNubContractTestCase._receivedFiles }
+    set { PubNubContractTestCase._receivedFiles = newValue }
+  }
+
   public var receivedPresenceChanges: [PubNubPresenceChange] {
     get { PubNubContractTestCase._receivedPresenceChanges }
     set { PubNubContractTestCase._receivedPresenceChanges = newValue }
@@ -97,9 +101,14 @@ let defaultPublishKey = "demo-36"
     }
     PubNubContractTestCase._currentConfiguration = configuration
   }
-  
+
   func createPubNubClient() -> PubNub {
-    PubNub(configuration: configuration)
+    // In the unit test target only, URLSession with a background configuration fails to create a URLSessionUploadTask.
+    // Therefore, it is replaced with a standard configuration: https://developer.apple.com/forums/thread/725625
+    PubNub(
+      configuration: configuration,
+      fileSession: URLSession(configuration: .default, delegate: FileSessionManager(), delegateQueue: .main)
+    )
   }
 
   public func startCucumberHookEventsListening() {
@@ -125,6 +134,8 @@ let defaultPublishKey = "demo-36"
     receivedMessages.removeAll()
     receivedPresenceChanges.removeAll()
     apiCallResults.removeAll()
+    receivedFiles.removeAll()
+    listener = nil
   }
 
   @objc public func setup() {
@@ -178,7 +189,7 @@ let defaultPublishKey = "demo-36"
       XCTAssertFalse(result is Error, "Last API call shouldn't fail.")
     }
 
-    Then("I receive error response") { _, _ in
+    Then("I receive (an )?error response") { _, _ in
       let lastResult = self.lastResult()
       XCTAssertNotNil(lastResult, "There is no API calls results.")
 
@@ -298,16 +309,34 @@ let defaultPublishKey = "demo-36"
         }
       }
     }
-
+    
     listener.didReceiveMessage = { [weak self] message in
       guard let strongSelf = self else { return }
       strongSelf.receivedMessages.append(message)
+      
+      if let handler = strongSelf.messageReceivedHandler {
+        handler(message, strongSelf.receivedMessages)
+      }
+    }
+    
+    listener.didReceiveSignal = { [weak self] message in
+      guard let strongSelf = self else { return }
+      strongSelf.receivedMessages.append(message)
 
       if let handler = strongSelf.messageReceivedHandler {
         handler(message, strongSelf.receivedMessages)
       }
     }
     
+    listener.didReceiveFileUpload = { [weak self] file in
+      guard let strongSelf = self else { return }
+      strongSelf.receivedFiles.append(file)
+      
+      if let handler = strongSelf.fileReceivedHandler {
+        handler(file, strongSelf.receivedFiles)
+      }
+    }
+    
     listener.didReceivePresence = { [weak self] presenceChange in
       guard let strongSelf = self else { return }
       strongSelf.receivedPresenceChanges.append(presenceChange)
@@ -319,7 +348,7 @@ let defaultPublishKey = "demo-36"
 
     client.add(listener)
     client.subscribe(to: channels, and: groups, at: timetoken, withPresence: presence)
-
+    
     wait(for: [subscribeStatusExpect], timeout: 10.0)
   }
 
@@ -343,8 +372,26 @@ let defaultPublishKey = "demo-36"
     }
   }
   
-  // MARK: - Presence
-  
+  public func waitForFiles(_: PubNub, count: Int) -> [PubNubFileEvent]? {
+    if receivedFiles.count < count {
+      let subscribeFileExpect = expectation(description: "Subscribe files")
+      subscribeFileExpect.assertForOverFulfill = false
+      fileReceivedHandler = { _, files in
+        if files.count >= count {
+          subscribeFileExpect.fulfill()
+        }
+      }
+      
+      wait(for: [subscribeFileExpect], timeout: 30.0)
+    }
+    
+    if receivedFiles.count > count {
+      return Array(receivedFiles[..<count])
+    } else {
+      return receivedFiles.count > 0 ? receivedFiles : nil
+    }
+  }
+    
   @discardableResult
   public func waitForPresenceChanges(_: PubNub, count: Int) -> [PubNubPresenceChange]? {
     if receivedPresenceChanges.count < count {
diff --git a/Tests/PubNubContractTest/Steps/EventEngine/PubNubPresenceEngineContractTestSteps.swift b/Tests/PubNubContractTest/Steps/EventEngine/PubNubPresenceEngineContractTestSteps.swift
index a28e73a8..6e990183 100644
--- a/Tests/PubNubContractTest/Steps/EventEngine/PubNubPresenceEngineContractTestSteps.swift
+++ b/Tests/PubNubContractTest/Steps/EventEngine/PubNubPresenceEngineContractTestSteps.swift
@@ -118,7 +118,7 @@ class PubNubPresenceEngineContractTestsSteps: PubNubEventEngineContractTestsStep
       ))
     }
     
-    Given("a linear reconnection policy with 3 retries") { _, _ in
+    Given("^a linear reconnection policy with 3 retries$") { _, _ in
       self.replacePubNubConfiguration(with: PubNubConfiguration(
         publishKey: self.configuration.publishKey,
         subscribeKey: self.configuration.subscribeKey,
diff --git a/Tests/PubNubContractTest/Steps/EventEngine/PubNubSubscribeEngineContractTestsSteps.swift b/Tests/PubNubContractTest/Steps/EventEngine/PubNubSubscribeEngineContractTestsSteps.swift
index 5b65bb57..a37be908 100644
--- a/Tests/PubNubContractTest/Steps/EventEngine/PubNubSubscribeEngineContractTestsSteps.swift
+++ b/Tests/PubNubContractTest/Steps/EventEngine/PubNubSubscribeEngineContractTestsSteps.swift
@@ -122,7 +122,7 @@ class PubNubSubscribeEngineContractTestsSteps: PubNubEventEngineContractTestsSte
   override public func setup() {
     startCucumberHookEventsListening()
     
-    Given("a linear reconnection policy with 3 retries") { _, _ in
+    Given("^a linear reconnection policy with 3 retries$") { _, _ in
       self.replacePubNubConfiguration(with: PubNubConfiguration(
         publishKey: self.configuration.publishKey,
         subscribeKey: self.configuration.subscribeKey,
@@ -136,7 +136,7 @@ class PubNubSubscribeEngineContractTestsSteps: PubNubEventEngineContractTestsSte
       ))
     }
     
-    Given("the demo keyset with event engine enabled") { _, _ in
+    Given("^the demo keyset with event engine enabled$") { _, _ in
       self.replacePubNubConfiguration(with: PubNubConfiguration(
         publishKey: self.configuration.publishKey,
         subscribeKey: self.configuration.subscribeKey,
@@ -149,24 +149,24 @@ class PubNubSubscribeEngineContractTestsSteps: PubNubEventEngineContractTestsSte
       ))
     }
     
-    When("I subscribe") { _, _ in
+    When("^I subscribe$") { _, _ in
       self.subscribeSynchronously(self.client, to: ["test"])
     }
     
-    When("I subscribe with timetoken 12345678901234567") { _, _ in
+    When("^I subscribe with timetoken 12345678901234567$") { _, _ in
       self.subscribeSynchronously(self.client, to: ["test"], timetoken: 12345678901234567)
     }
     
-    Then("I receive an error in my subscribe response") { _, _ in
+    Then("^I receive an error in my subscribe response$") { _, _ in
       XCTAssertNotNil(self.receivedErrorStatuses.first)
     }
     
-    Then("I receive the message in my subscribe response") { _, _ in
+    Then("^I receive the message in my subscribe response$") { _, _ in
       let messages = self.waitForMessages(self.client, count: 1) ?? []
       XCTAssertNotNil(messages.first)
     }
     
-    Match(["And"], "I observe the following:") { _, value in
+    Match(["And"], "^I observe the following:$") { _, value in
       let recordedEvents = self.transitionDecorator.recordedEvents.map { $0.contractTestIdentifier }
       let recordedInvocations = self.dispatcherDecorator.recordedInvocations.map { $0.contractTestIdentifier }
       
diff --git a/Tests/PubNubContractTest/Steps/Files/PubNubFilesContractTestSteps.swift b/Tests/PubNubContractTest/Steps/Files/PubNubFilesContractTestSteps.swift
index 8de81dfe..94205249 100644
--- a/Tests/PubNubContractTest/Steps/Files/PubNubFilesContractTestSteps.swift
+++ b/Tests/PubNubContractTest/Steps/Files/PubNubFilesContractTestSteps.swift
@@ -104,5 +104,33 @@ public class PubNubFilesContractTestSteps: PubNubContractTestCase {
 
       self.wait(for: [sendFileExpect], timeout: 60.0)
     }
+        
+    When("^I send a file with '(.+)' customMessageType$") { args, _ in
+      let type = args?.first ?? String()
+      let sendFileExpect = self.expectation(description: "Send file Response")
+
+      guard let data = "test file data".data(using: .utf8) else {
+        XCTAssert(false, "Unable prepare file data")
+        return
+      }
+
+      let publishFileRequest = PubNub.PublishFileRequest(customMessageType: type)
+      
+      self.client.send(
+        .data(data, contentType: nil),
+        channel: "test", remoteFilename: "name.txt",
+        publishRequest: publishFileRequest
+      ) { result in
+        switch result {
+        case let .success(sendResults):
+          self.handleResult(result: sendResults)
+        case let .failure(error):
+          self.handleResult(result: error)
+        }
+        sendFileExpect.fulfill()
+      }
+
+      self.wait(for: [sendFileExpect], timeout: 60.0)
+    }
   }
 }
diff --git a/Tests/PubNubContractTest/Steps/History/PubNubHistoryContractTestSteps.swift b/Tests/PubNubContractTest/Steps/History/PubNubHistoryContractTestSteps.swift
index e0721ee4..f23c987b 100644
--- a/Tests/PubNubContractTest/Steps/History/PubNubHistoryContractTestSteps.swift
+++ b/Tests/PubNubContractTest/Steps/History/PubNubHistoryContractTestSteps.swift
@@ -15,8 +15,69 @@ import PubNubSDK
 public class PubNubHistoryContractTestSteps: PubNubContractTestCase {
   override public func setup() {
     startCucumberHookEventsListening()
+    
+    When("^I fetch message history for '(.*)' channel$") { args, _ in
+      guard let channel = args?.first else {
+        XCTAssertNotNil(args?.first, "Step match failed")
+        return
+      }
+
+      let historyExpect = self.expectation(description: "Fetch history Response")
 
-    When("^I fetch message history for (.*) channel(s)?$") { args, _ in
+      self.client.fetchMessageHistory(for: [channel]) { result in
+        switch result {
+        case let .success((messagesByChannel, next)):
+          self.handleResult(result: (messagesByChannel, next))
+        case let .failure(error):
+          self.handleResult(result: error)
+        }
+        historyExpect.fulfill()
+      }
+
+      self.wait(for: [historyExpect], timeout: 60.0)
+    }
+    
+    Match(["And"], "^history response contains messages (with|without) (?:customMessageType|'([^']*)' and '([^']*)' (?:message )?types?)$") { args, _ in
+      guard let matches = args, let inclusionFlag = matches.first else {
+        XCTAssertNotNil(args?.first, "Step match failed")
+        return
+      }
+      guard let lastResult = self.lastResult() else {
+        XCTFail("Fetch history didn't returned response"); return
+      }
+      guard
+        let result = lastResult as? (messagesByChannel: [String: [PubNubMessageBase]], next: PubNubBoundedPage?),
+        let channel = result.messagesByChannel.first?.key, let messages = result.messagesByChannel[channel]
+      else {
+        XCTFail("Fetch history returned unexpected response"); return
+      }
+      
+      XCTAssertGreaterThan(messages.count, 0)
+      
+      var messagesWithTypes: [String] = []
+      
+      switch self.currentScenario?.name {
+      case "Client can fetch history without customMessageType enabled by default":
+        messagesWithTypes = messages.compactMap { $0.customMessageType }
+      case "Client can fetch history with customMessageType":
+        messagesWithTypes = messages.compactMap { $0.customMessageType }
+      case "Client can fetch history with message types":
+        messagesWithTypes = messages.compactMap { String(describing: $0.messageType.rawValue) }
+      default:
+        XCTFail("Unexpected condition")
+      }
+      
+      XCTAssertFalse(inclusionFlag == "with" && messagesWithTypes.count == 0)
+      XCTAssertFalse(inclusionFlag == "without" && messagesWithTypes.count > 0)
+      
+      if matches.count > 1 {
+        XCTAssertTrue(messagesWithTypes.map { String(describing: $0.rawValue) }.allSatisfy { Array(matches[1...]).contains($0) })
+      } else {
+        XCTAssertEqual(inclusionFlag == "with" ? messages.count : 0, messagesWithTypes.count)
+      }
+    }
+    
+    When("^I fetch message history for (single|multiple) channel(s)?$") { args, _ in
       guard let type = args?.first else {
         XCTAssertNotNil(args?.first, "Step match failed")
         return
@@ -37,6 +98,33 @@ public class PubNubHistoryContractTestSteps: PubNubContractTestCase {
 
       self.wait(for: [historyExpect], timeout: 60.0)
     }
+    
+    When("^I fetch message history with (messageType|customMessageType) for '(.*)' channel$") { args, _ in
+      guard let type = args?.first, let channel = args?.last else {
+        XCTAssertNotNil(args?.first, "Step match failed")
+        return
+      }
+      
+      let historyExpect = self.expectation(description: "Fetch history Response")
+      let includeMessageType = true
+      let includeCustomMessageType = type == "customMessageType"
+      
+      self.client.fetchMessageHistory(
+        for: [channel],
+        includeMessageType: includeMessageType,
+        includeCustomMessageType: includeCustomMessageType
+      ) { result in
+        switch result {
+        case let .success((messagesByChannel, next)):
+          self.handleResult(result: (messagesByChannel, next))
+        case let .failure(error):
+          self.handleResult(result: error)
+        }
+        historyExpect.fulfill()
+      }
+
+      self.wait(for: [historyExpect], timeout: 60.0)
+    }
 
     Then("the response contains pagination info") { _, _ in
       guard let lastResult = self.lastResult() else {
@@ -66,5 +154,36 @@ public class PubNubHistoryContractTestSteps: PubNubContractTestCase {
 
       self.wait(for: [historyExpect], timeout: 60.0)
     }
+    
+    When("^I fetch message history with '(.*)' set to '(.*)' for '(.*)' channel$") { args, _ in
+      guard args?.count == 3, let channel = args?[2] else {
+        XCTAssertNotNil(args?.first, "Step match failed")
+        return
+      }
+      
+      /// Message types enabled by default and user can only opt-out them.
+      var includeType = true
+      
+      if args?.first == "include_custom_message_type" {
+        includeType = args?[1] == "true"
+      }
+      
+      let historyExpect = self.expectation(description: "Fetch history Response")
+
+      self.client.fetchMessageHistory(
+        for: [channel],
+        includeCustomMessageType: includeType
+      ) { result in
+        switch result {
+        case let .success((messagesByChannel, next)):
+          self.handleResult(result: (messagesByChannel, next))
+        case let .failure(error):
+          self.handleResult(result: error)
+        }
+        historyExpect.fulfill()
+      }
+
+      self.wait(for: [historyExpect], timeout: 60.0)
+    }
   }
 }
diff --git a/Tests/PubNubContractTest/Steps/Publish/PubNubPublishContractTestSteps.swift b/Tests/PubNubContractTest/Steps/Publish/PubNubPublishContractTestSteps.swift
index 633171a9..f2752b53 100644
--- a/Tests/PubNubContractTest/Steps/Publish/PubNubPublishContractTestSteps.swift
+++ b/Tests/PubNubContractTest/Steps/Publish/PubNubPublishContractTestSteps.swift
@@ -16,7 +16,7 @@ public class PubNubPublishContractTestSteps: PubNubContractTestCase {
   override public func setup() {
     startCucumberHookEventsListening()
 
-    When("I publish a message") { _, _ in
+    When("^I publish a message$") { _, _ in
       let publishMessageExpect = self.expectation(description: "Publish message Response")
 
       self.client.publish(channel: "test", message: "hello") { result in
@@ -54,7 +54,32 @@ public class PubNubPublishContractTestSteps: PubNubContractTestCase {
       self.wait(for: [publishMessageExpect], timeout: 60.0)
     }
 
-    When("I send a signal") { _, _ in
+    When("^I publish message with '(.*)' customMessageType$") { args, _ in
+      guard let type = args?.first as? String? else {
+        XCTAssertNotNil(args?.first, "Step match failed")
+        return
+      }
+
+      let publishMessageExpect = self.expectation(description: "Publish message with space and type Response")
+
+      self.client.publish(
+        channel: "test",
+        message: "hello",
+        customMessageType: type
+      ) { result in
+        switch result {
+        case let .success(timetoken):
+          self.handleResult(result: timetoken)
+        case let .failure(error):
+          self.handleResult(result: error)
+        }
+        publishMessageExpect.fulfill()
+      }
+
+      self.wait(for: [publishMessageExpect], timeout: 60.0)
+    }
+
+    When("^I send a signal$") { _, _ in
       let sendSignalExpect = self.expectation(description: "Send signal Response")
 
       self.client.signal(channel: "test", message: "hello") { result in
@@ -69,5 +94,31 @@ public class PubNubPublishContractTestSteps: PubNubContractTestCase {
 
       self.wait(for: [sendSignalExpect], timeout: 60.0)
     }
+
+
+    When("^I send a signal with '(.*)' customMessageType$") { args, _ in
+      guard let type = args?.last else {
+        XCTAssertNotNil(args?.first, "Step match failed")
+        return
+      }
+
+      let publishMessageExpect = self.expectation(description: "Publish message with space and type Response")
+
+      self.client.signal(
+        channel: "test",
+        message: "hello",
+        customMessageType: type
+      ) { result in
+        switch result {
+        case let .success(timetoken):
+          self.handleResult(result: timetoken)
+        case let .failure(error):
+          self.handleResult(result: error)
+        }
+        publishMessageExpect.fulfill()
+      }
+
+      self.wait(for: [publishMessageExpect], timeout: 60.0)
+    }
   }
 }
diff --git a/Tests/PubNubContractTest/Steps/Subscribe/PubNubSubscribeContractTestSteps.swift b/Tests/PubNubContractTest/Steps/Subscribe/PubNubSubscribeContractTestSteps.swift
index 0713ebe9..f82126ae 100644
--- a/Tests/PubNubContractTest/Steps/Subscribe/PubNubSubscribeContractTestSteps.swift
+++ b/Tests/PubNubContractTest/Steps/Subscribe/PubNubSubscribeContractTestSteps.swift
@@ -46,22 +46,38 @@ public class PubNubSubscribeContractTestSteps: PubNubContractTestCase {
   override public func setup() {
     startCucumberHookEventsListening()
 
-    Given("the crypto keyset") { _, _ in
+    Given("^the crypto keyset$") { _, _ in
       self.cryptoModule = CryptoModule.legacyCryptoModule(with: "enigma")
     }
 
-    Given("the invalid-crypto keyset") { _, _ in
+    Given("^the invalid-crypto keyset$") { _, _ in
       self.cryptoModule = CryptoModule.legacyCryptoModule(with: "secret")
     }
-
-    When("I subscribe") { _, _ in
+    
+    When("^I subscribe$") { _, _ in
       self.subscribeSynchronously(self.client, to: ["test"])
       // Give some time to rotate received timetokens.
       self.waitFor(delay: 0.25)
     }
+    
+    When("^I subscribe to '(.*)' channel$") { args, _ in
+      guard let matches = args, let channel = matches.first else {
+        XCTAssertNotNil(args?.first, "Step match failed")
+        return
+      }
+      
+      self.subscribeSynchronously(self.client, to: [channel])
+      // Give some time to rotate received timetokens.
+      self.waitFor(delay: 0.25)
+    }
 
-    Then("I receive the message in my subscribe response") { _, userInfo in
-      let messages = self.waitForMessages(self.client, count: 1)
+    Then("^I receive (the|[0-9]+) message(s)? in my subscribe response$") { args, userInfo in
+      guard let match = args?.first else {
+        XCTAssertNotNil(args?.first, "Step match failed")
+        return
+      }
+
+      let messages = self.waitForMessages(self.client, count: Int(match) ?? 1)
       XCTAssertNotNil(messages)
 
       if self.checkTestingFeature(feature: "MessageEncryption", userInfo: userInfo!) {
@@ -99,5 +115,18 @@ public class PubNubSubscribeContractTestSteps: PubNubContractTestCase {
       /// Give some more time for SDK to check that it won't retry after 0.1 seconds.
       self.waitFor(delay: 0.3)
     }
+    
+    Match(["And"], "^response contains messages with '(.*)' and '(.*)' types$") { args, _ in
+      guard let matches = args else {
+        XCTAssertNotNil(args?.first, "Step match failed")
+        return
+      }
+      
+      let messages = self.waitForMessages(self.client, count: 2)!
+      XCTAssertNotNil(messages)
+      
+      let messagesWithTypes = messages.compactMap { $0.customMessageType }
+      XCTAssertTrue(messagesWithTypes.map { $0.description }.allSatisfy { matches.contains($0) })
+    }
   }
 }
diff --git a/Tests/PubNubTests/Events/Old/SubscriptionStreamTests.swift b/Tests/PubNubTests/Events/Old/SubscriptionStreamTests.swift
index 4ad1ba0e..395bab5a 100644
--- a/Tests/PubNubTests/Events/Old/SubscriptionStreamTests.swift
+++ b/Tests/PubNubTests/Events/Old/SubscriptionStreamTests.swift
@@ -19,7 +19,8 @@ class SubscriptionListenerTests: XCTestCase {
     channel: "Channel",
     subscription: "Channel",
     published: 0,
-    metadata: "Message"
+    metadata: "Message",
+    messageType: .message
   )
   let connectionEvent: ConnectionStatus = .connected
   let statusEvent: SubscriptionListener.StatusEvent = .success(.connected)
diff --git a/Tests/PubNubTests/Networking/Routers/HistoryRouterTests.swift b/Tests/PubNubTests/Networking/Routers/HistoryRouterTests.swift
index 56d3895b..4f2abd65 100644
--- a/Tests/PubNubTests/Networking/Routers/HistoryRouterTests.swift
+++ b/Tests/PubNubTests/Networking/Routers/HistoryRouterTests.swift
@@ -33,7 +33,8 @@ extension HistoryRouterTests {
     let router = HistoryRouter(
       .fetch(
         channels: testMultiChannels, max: nil, start: nil, end: nil,
-        includeMeta: false, includeMessageType: false, includeUUID: false
+        includeMeta: false, includeMessageType: false,
+        includeCustomMessageType: false, includeUUID: false
       ),
       configuration: config
     )
@@ -54,7 +55,8 @@ extension HistoryRouterTests {
     let router = HistoryRouter(
       .fetch(
         channels: [], max: nil, start: nil, end: nil,
-        includeMeta: false, includeMessageType: false, includeUUID: false
+        includeMeta: false, includeMessageType: false,
+        includeCustomMessageType: false, includeUUID: false
       ),
       configuration: config
     )
@@ -67,7 +69,8 @@ extension HistoryRouterTests {
     let router = HistoryRouter(
       .fetch(
         channels: testMultiChannels, max: nil, start: nil, end: nil,
-        includeMeta: false, includeMessageType: false, includeUUID: false
+        includeMeta: false, includeMessageType: false,
+        includeCustomMessageType: false, includeUUID: false
       ),
       configuration: config
     )
@@ -264,7 +267,8 @@ extension HistoryRouterTests {
     let router = HistoryRouter(
       .fetchWithActions(
         channel: testChannel, max: nil, start: nil, end: nil,
-        includeMeta: false, includeMessageType: false, includeUUID: false
+        includeMeta: false, includeMessageType: false,
+        includeCustomMessageType: false, includeUUID: false
       ),
       configuration: config
     )
@@ -278,7 +282,8 @@ extension HistoryRouterTests {
     let router = HistoryRouter(
       .fetchWithActions(
         channel: "", max: nil, start: nil, end: nil,
-        includeMeta: false, includeMessageType: false, includeUUID: false
+        includeMeta: false, includeMessageType: false,
+        includeCustomMessageType: false, includeUUID: false
       ),
       configuration: config
     )
@@ -291,7 +296,8 @@ extension HistoryRouterTests {
     let router = HistoryRouter(
       .fetchWithActions(
         channel: testChannel, max: nil, start: nil, end: nil,
-        includeMeta: false, includeMessageType: false, includeUUID: false
+        includeMeta: false, includeMessageType: false, 
+        includeCustomMessageType: false, includeUUID: false
       ),
       configuration: config
     )
diff --git a/Tests/PubNubTests/Networking/Routers/PublishRouterTests.swift b/Tests/PubNubTests/Networking/Routers/PublishRouterTests.swift
index 3f220621..aae12350 100644
--- a/Tests/PubNubTests/Networking/Routers/PublishRouterTests.swift
+++ b/Tests/PubNubTests/Networking/Routers/PublishRouterTests.swift
@@ -31,7 +31,7 @@ final class PublishRouterTests: XCTestCase {
 extension PublishRouterTests {
   func testPublish_Router() {
     let router = PublishRouter(
-      .publish(message: testMessage, channel: testChannel, shouldStore: nil, ttl: nil, meta: nil),
+      .publish(message: testMessage, channel: testChannel, customMessageType: nil, shouldStore: nil, ttl: nil, meta: nil),
       configuration: config
     )
 
@@ -47,7 +47,7 @@ extension PublishRouterTests {
 
   func testPublish_Router_ValidationError() {
     let router = PublishRouter(
-      .publish(message: [], channel: testChannel, shouldStore: nil, ttl: nil, meta: nil),
+      .publish(message: [], channel: testChannel, customMessageType: nil, shouldStore: nil, ttl: nil, meta: nil),
       configuration: config
     )
 
@@ -221,7 +221,7 @@ extension PublishRouterTests {
 extension PublishRouterTests {
   func testCompressedPublish_Router() {
     let router = PublishRouter(
-      .compressedPublish(message: testMessage, channel: testChannel, shouldStore: nil, ttl: nil, meta: nil),
+      .compressedPublish(message: testMessage, channel: testChannel, customMessageType: nil, shouldStore: nil, ttl: nil, meta: nil),
       configuration: config
     )
 
@@ -232,7 +232,7 @@ extension PublishRouterTests {
 
   func testCompressedPublish_Router_ValidationError() {
     let router = PublishRouter(
-      .compressedPublish(message: [], channel: testChannel, shouldStore: nil, ttl: nil, meta: nil),
+      .compressedPublish(message: [], channel: testChannel, customMessageType: nil, shouldStore: nil, ttl: nil, meta: nil),
       configuration: config
     )
 
@@ -268,7 +268,7 @@ extension PublishRouterTests {
     let router = PublishRouter(
       .file(
         message: FilePublishPayload(channel: testChannel, fileId: testFileId, filename: testFilename),
-        shouldStore: nil, ttl: nil, meta: nil
+        customMessageType: nil, shouldStore: nil, ttl: nil, meta: nil
       ),
       configuration: config
     )
@@ -277,6 +277,38 @@ extension PublishRouterTests {
     XCTAssertEqual(router.category, "Publish a File Message")
     XCTAssertEqual(router.service, .publish)
   }
+  
+  func testFile_Router_nilMessageTypeAndSpaceId() {
+    let router = PublishRouter(
+      .file(
+        message: FilePublishPayload(channel: testChannel, fileId: testFileId, filename: testFilename),
+        customMessageType: nil, shouldStore: nil, ttl: nil, meta: nil
+      ),
+      configuration: config
+    )
+    
+    guard let queryItems = try? router.queryItems.get() else {
+      return XCTAssert(false, "'queryItems' not set")
+    }
+    
+    XCTAssertNil(queryItems.first(where: { $0.name == QueryKey.type.rawValue }))
+  }
+  
+  func testFile_Router_notNilMessageType() {
+    let router = PublishRouter(
+      .file(
+        message: FilePublishPayload(channel: testChannel, fileId: testFileId, filename: testFilename),
+        customMessageType: "type", shouldStore: nil, ttl: nil, meta: nil
+      ),
+      configuration: config
+    )
+    
+    guard let queryItems = try? router.queryItems.get() else {
+      return XCTAssert(false, "'queryItems' not set")
+    }
+    
+    XCTAssertTrue(queryItems.contains(URLQueryItem(name: QueryKey.customMessageType.rawValue, value: "type")))
+  }
 
   func testFile_Router_Validate_Message() {
     let file = FilePublishPayload(
@@ -299,7 +331,7 @@ extension PublishRouterTests {
     let router = PublishRouter(
       .file(
         message: FilePublishPayload(channel: "", fileId: testFileId, filename: testFilename),
-        shouldStore: nil, ttl: nil, meta: nil
+        customMessageType: nil, shouldStore: nil, ttl: nil, meta: nil
       ),
       configuration: config
     )
@@ -310,7 +342,7 @@ extension PublishRouterTests {
     let router = PublishRouter(
       .file(
         message: FilePublishPayload(channel: testChannel, fileId: "", filename: testFilename),
-        shouldStore: nil, ttl: nil, meta: nil
+        customMessageType: nil, shouldStore: nil, ttl: nil, meta: nil
       ),
       configuration: config
     )
@@ -321,7 +353,7 @@ extension PublishRouterTests {
     let router = PublishRouter(
       .file(
         message: FilePublishPayload(channel: testChannel, fileId: testFileId, filename: ""),
-        shouldStore: nil, ttl: nil, meta: nil
+        customMessageType: nil, shouldStore: nil, ttl: nil, meta: nil
       ),
       configuration: config
     )
@@ -420,7 +452,7 @@ extension PublishRouterTests {
 
 extension PublishRouterTests {
   func testSignal_Router() {
-    let router = PublishRouter(.signal(message: testMessage, channel: testChannel), configuration: config)
+    let router = PublishRouter(.signal(message: testMessage, channel: testChannel, customMessageType: nil), configuration: config)
 
     XCTAssertEqual(router.endpoint.description, "Signal")
     XCTAssertEqual(router.category, "Signal")
@@ -428,7 +460,7 @@ extension PublishRouterTests {
   }
 
   func testSignal_Router_ValidationError() {
-    let router = PublishRouter(.signal(message: "", channel: testChannel), configuration: config)
+    let router = PublishRouter(.signal(message: "", channel: testChannel, customMessageType: nil), configuration: config)
 
     XCTAssertNotEqual(router.validationError?.pubNubError, PubNubError(.invalidEndpointType, router: router))
   }