diff --git a/src/Funogram.Generator/CustomFields.json b/src/Funogram.Generator/CustomFields.json
new file mode 100644
index 0000000..cd97099
--- /dev/null
+++ b/src/Funogram.Generator/CustomFields.json
@@ -0,0 +1,38 @@
+[
+  {
+    "Name": "VideoChatStarted",
+    "Kind": {
+      "Case": "Fields",
+      "Fields": [
+        [
+          {
+            "OriginalName": "id",
+            "ConvertedName": "Id",
+            "Description": "Unique identifier of video chat (not present in Bot API at the moment, for internal use)",
+            "OriginalFieldType": "Integer",
+            "ConvertedFieldType": "int64",
+            "Optional": true
+          }
+        ]
+      ]
+    }
+  },
+  {
+    "Name": "VideoChatEnded",
+    "Kind": {
+      "Case": "Fields",
+      "Fields": [
+        [
+          {
+            "OriginalName": "id",
+            "ConvertedName": "Id",
+            "Description": "Unique identifier of video chat (not present in Bot API at the moment, for internal use)",
+            "OriginalFieldType": "Integer",
+            "ConvertedFieldType": "int64",
+            "Optional": true
+          }
+        ]
+      ]
+    }
+  }
+]
\ No newline at end of file
diff --git a/src/Funogram.Generator/Funogram.Generator.fsproj b/src/Funogram.Generator/Funogram.Generator.fsproj
index 69dfc57..d1db48c 100644
--- a/src/Funogram.Generator/Funogram.Generator.fsproj
+++ b/src/Funogram.Generator/Funogram.Generator.fsproj
@@ -19,6 +19,7 @@
         <Compile Include="Program.fs" />
         <Content Include="RemapTypes.json" />
         <Content Include="RemapMethods.json" />
+        <Content Include="CustomFields.json" />
     </ItemGroup>
 
     <ItemGroup>
diff --git a/src/Funogram.Generator/Program.fs b/src/Funogram.Generator/Program.fs
index 9649c00..af6fa92 100644
--- a/src/Funogram.Generator/Program.fs
+++ b/src/Funogram.Generator/Program.fs
@@ -38,6 +38,7 @@ let processAsync (args: CliArguments list) =
       |> TypesParser.withResultPath (Path.Combine(Constants.OutputDir, "types.json"))
       |> TypesParser.loadRemapData "./RemapTypes.json"
       |> TypesParser.parse
+      |> TypesParser.mergeCustomFields "./CustomFields.json"
       
       |> TypesGenerator.mkGenerator (Path.Combine(Constants.CodeOutputDir, Constants.TypesFileName))
       |> TypesGenerator.generate
diff --git a/src/Funogram.Generator/Types/TypesParser.fs b/src/Funogram.Generator/Types/TypesParser.fs
index a85ac2f..20d9adf 100644
--- a/src/Funogram.Generator/Types/TypesParser.fs
+++ b/src/Funogram.Generator/Types/TypesParser.fs
@@ -240,4 +240,38 @@ let parse (config: ParseConfig) =
   | None ->
     ()
     
-  types
\ No newline at end of file
+  types
+
+let mergeCustomFields (customFieldsPath: string) (types: ApiType[]) =
+  if File.Exists customFieldsPath then
+    let serializerOptions = Helpers.getJsonSerializerOptions ()
+
+    use file = File.OpenRead customFieldsPath
+    let result =
+      JsonSerializer.Deserialize<ApiType[]>(file, serializerOptions)
+      |> Seq.map (fun x -> x.Name, x) |> Map.ofSeq
+    
+    let types = [|
+      for tp in types do
+        match result |> Map.tryFind tp.Name with
+        | Some typeWithCustomFields ->
+          match tp.Kind, typeWithCustomFields.Kind with
+          | ApiTypeKind.Fields fields, ApiTypeKind.Fields extraFields ->
+            let mergedFields = Array.append fields extraFields
+            let mergedFieldsDistinct = mergedFields |> Array.distinctBy (_.ConvertedName)
+            
+            if mergedFields.Length <> mergedFieldsDistinct.Length then
+              failwith $"Custom fields must be unique (type {tp.Name}).\nTelegram API fields:\n%A{fields}\nCustom fields:\n%A{extraFields}"
+            
+            yield { tp with Kind = ApiTypeKind.Fields mergedFields }
+          | ApiTypeKind.Stub, kind ->
+            yield { tp with Kind = kind }
+          | _ ->
+            yield tp
+        | None -> yield tp
+    |]
+    
+    types
+  else
+    printfn "WARN: Custom fields file not found at path %s" customFieldsPath
+    types
\ No newline at end of file
diff --git a/src/Funogram.Telegram/Directory.Build.props b/src/Funogram.Telegram/Directory.Build.props
index 4e03b45..f1fc90c 100644
--- a/src/Funogram.Telegram/Directory.Build.props
+++ b/src/Funogram.Telegram/Directory.Build.props
@@ -1,6 +1,6 @@
 <Project>
     <PropertyGroup>
-        <Version>7.3.0.0</Version>
+        <Version>7.3.0.1</Version>
         <Authors>Nikolay Matyushin</Authors>
         <Product>Funogram.Telegram</Product>
         <Title>Funogram.Telegram</Title>
diff --git a/src/Funogram.Telegram/Types.fs b/src/Funogram.Telegram/Types.fs
index 4bfd82d..d5f08b0 100644
--- a/src/Funogram.Telegram/Types.fs
+++ b/src/Funogram.Telegram/Types.fs
@@ -2058,8 +2058,16 @@ and [<CLIMutable>] VideoChatScheduled =
     }
 
 /// This object represents a service message about a video chat started in the chat. Currently holds no information.
-and VideoChatStarted =
-  new() = {}
+and [<CLIMutable>] VideoChatStarted =
+  {
+    /// Unique identifier of video chat (not present in Bot API at the moment, for internal use)
+    [<DataMember(Name = "id")>]
+    Id: int64 option
+  }
+  static member Create(?id: int64) = 
+    {
+      Id = id
+    }
 
 /// This object represents a service message about a video chat ended in the chat.
 and [<CLIMutable>] VideoChatEnded =
@@ -2067,10 +2075,14 @@ and [<CLIMutable>] VideoChatEnded =
     /// Video chat duration in seconds
     [<DataMember(Name = "duration")>]
     Duration: int64
+    /// Unique identifier of video chat (not present in Bot API at the moment, for internal use)
+    [<DataMember(Name = "id")>]
+    Id: int64 option
   }
-  static member Create(duration: int64) = 
+  static member Create(duration: int64, ?id: int64) = 
     {
       Duration = duration
+      Id = id
     }
 
 /// This object represents a service message about new members invited to a video chat.