diff --git a/src/telegram-service/Deal.Telegram/Deal.Telegram.csproj b/src/telegram-service/Deal.Telegram/Deal.Telegram.csproj
index 6f91c32..2e4c92a 100644
--- a/src/telegram-service/Deal.Telegram/Deal.Telegram.csproj
+++ b/src/telegram-service/Deal.Telegram/Deal.Telegram.csproj
@@ -35,6 +35,9 @@
          единый источник вместо копий в трёх сервисах. -->
     <ProjectReference Include="..\..\grpc-hosting\Deal.Grpc.Hosting\Deal.Grpc.Hosting.csproj" />
     <ProjectReference Include="..\..\contracts\Deal.Proto.csproj" />
+    <!-- Каталоги констант интеграции (TelegramOperations/TelegramAuthPhases): единый источник
+         строковых кодов операций и фаз вместо литералов в сервисе. -->
+    <ProjectReference Include="..\..\core\Deal.Contracts\Deal.Contracts.csproj" />
   </ItemGroup>
 
 </Project>
diff --git a/src/telegram-service/Deal.Telegram/Sessions/TenantSession.cs b/src/telegram-service/Deal.Telegram/Sessions/TenantSession.cs
index 3fabfeb..0ec3a25 100644
--- a/src/telegram-service/Deal.Telegram/Sessions/TenantSession.cs
+++ b/src/telegram-service/Deal.Telegram/Sessions/TenantSession.cs
@@ -1,3 +1,4 @@
+using Deal.Contracts.Integrations.Models;
 using Deal.Telegram.Telegram;
 using Grpc.Core;
 
@@ -244,7 +245,7 @@ public sealed class TenantSession : IAsyncDisposable
                 throw;
             }
 
-            if (nextStep == "password")
+            if (nextStep == TelegramAuthPhases.Password)
             {
                 _phase = AuthPhase.Password;
                 return Snapshot();
diff --git a/src/telegram-service/Deal.Telegram/Telegram/WTelegramSessionClient.cs b/src/telegram-service/Deal.Telegram/Telegram/WTelegramSessionClient.cs
index 211670e..de4682f 100644
--- a/src/telegram-service/Deal.Telegram/Telegram/WTelegramSessionClient.cs
+++ b/src/telegram-service/Deal.Telegram/Telegram/WTelegramSessionClient.cs
@@ -1,4 +1,5 @@
 using System.Globalization;
+using Deal.Contracts.Integrations.Models;
 using Deal.Telegram.Caching;
 using Deal.Telegram.Sessions;
 using Grpc.Core;
@@ -31,6 +32,12 @@ public sealed class WTelegramSessionClient : ISessionClient
     // Ёмкость LRU-кэша сущностей пользователей (последние использованные имена).
     private const int UserEntityCacheCapacity = 2000;
 
+    // Ключ конфигурации WTelegramClient с api_id приложения.
+    private const string ApiIdKey = "api_id";
+
+    // Ключ конфигурации WTelegramClient с api_hash приложения.
+    private const string ApiHashKey = "api_hash";
+
     // LRU-кэш access_hash сущностей (ключ — подписанный id диалога; заполняется из ответов).
     private readonly LruCache<string, long> _entityAccessHashes = new(AccessHashCacheCapacity);
 
@@ -128,7 +135,7 @@ public sealed class WTelegramSessionClient : ISessionClient
         catch (RpcException exception) when (exception.Code == 401 && exception.Message == "SESSION_PASSWORD_NEEDED")
         {
             // Включён 2FA — следующий шаг: облачный пароль (submit_password).
-            return "password";
+            return TelegramAuthPhases.Password;
         }
         catch (RpcException exception) when (exception.Code == 400 && exception.Message == "PHONE_CODE_INVALID")
         {
@@ -729,8 +736,8 @@ public sealed class WTelegramSessionClient : ISessionClient
     private string? ConfigProvider(string what)
         => what switch
         {
-            "api_id" => _apiId.ToString(System.Globalization.CultureInfo.InvariantCulture),
-            "api_hash" => _apiHash,
+            ApiIdKey => _apiId.ToString(System.Globalization.CultureInfo.InvariantCulture),
+            ApiHashKey => _apiHash,
             _ => null,
         };
 
diff --git a/src/telegram-service/Deal.Telegram/TelegramServiceImpl.cs b/src/telegram-service/Deal.Telegram/TelegramServiceImpl.cs
index 7e7c24b..8b9daed 100644
--- a/src/telegram-service/Deal.Telegram/TelegramServiceImpl.cs
+++ b/src/telegram-service/Deal.Telegram/TelegramServiceImpl.cs
@@ -1,3 +1,4 @@
+using Deal.Contracts.Integrations.Models;
 using Deal.Grpc.Telegram;
 using Deal.Telegram.Core;
 using Deal.Telegram.Dialogs;
@@ -106,7 +107,7 @@ public sealed class TelegramServiceImpl : TelegramService.TelegramServiceBase
         TenantSessionSnapshot snapshot = await ExecuteAsync(
             tenantId,
             ct => _sessionFarm.StartPhoneAsync(tenantId, request.ApiId, request.ApiHash, request.Phone, ct),
-            "start_phone",
+            TelegramOperations.StartPhone,
             context).ConfigureAwait(false);
 
         return new StartPhoneReply { Phase = PhaseToString(snapshot.Phase) };
@@ -122,7 +123,7 @@ public sealed class TelegramServiceImpl : TelegramService.TelegramServiceBase
         TenantSessionSnapshot snapshot = await ExecuteAsync(
             tenantId,
             ct => _sessionFarm.StartQrAsync(tenantId, request.ApiId, request.ApiHash, ct),
-            "start_qr",
+            TelegramOperations.StartQr,
             context).ConfigureAwait(false);
 
         var reply = new StartQrReply { Phase = PhaseToString(snapshot.Phase) };
@@ -144,7 +145,7 @@ public sealed class TelegramServiceImpl : TelegramService.TelegramServiceBase
         TenantSessionSnapshot snapshot = await ExecuteAsync(
             tenantId,
             ct => _sessionFarm.SendCodeAsync(tenantId, request.Code, ct),
-            "send_code",
+            TelegramOperations.SendCode,
             context).ConfigureAwait(false);
 
         return new SendCodeReply { Phase = PhaseToString(snapshot.Phase) };
@@ -160,7 +161,7 @@ public sealed class TelegramServiceImpl : TelegramService.TelegramServiceBase
         TenantSessionSnapshot snapshot = await ExecuteAsync(
             tenantId,
             ct => _sessionFarm.SendPasswordAsync(tenantId, request.Password, ct),
-            "send_password",
+            TelegramOperations.SendPassword,
             context).ConfigureAwait(false);
 
         return new SendPasswordReply { Phase = PhaseToString(snapshot.Phase) };
@@ -176,7 +177,7 @@ public sealed class TelegramServiceImpl : TelegramService.TelegramServiceBase
         await ExecuteAsync(
             tenantId,
             ct => _sessionFarm.LogoutAsync(tenantId, ct),
-            "logout",
+            TelegramOperations.Logout,
             context).ConfigureAwait(false);
 
         _catalog.Reset(tenantId);
@@ -208,7 +209,7 @@ public sealed class TelegramServiceImpl : TelegramService.TelegramServiceBase
                 result.Entries.AddRange(entries);
                 return result;
             },
-            "refresh_dialogs",
+            TelegramOperations.RefreshDialogs,
             context).ConfigureAwait(false);
         return reply;
     }
@@ -257,7 +258,7 @@ public sealed class TelegramServiceImpl : TelegramService.TelegramServiceBase
         int processed = await ExecuteAsync(
             tenantId,
             ct => _backfill.ExecuteAsync(tenantId, request.DialogId, request.Force, ct),
-            "backfill",
+            TelegramOperations.Backfill,
             context).ConfigureAwait(false);
         return new BackfillReply { Processed = processed };
     }
@@ -285,7 +286,7 @@ public sealed class TelegramServiceImpl : TelegramService.TelegramServiceBase
                 await _sessionFarm.MarkReadAsync(tenantId, request.DialogId, ct).ConfigureAwait(false);
                 return result;
             },
-            "read_recent",
+            TelegramOperations.ReadRecent,
             context).ConfigureAwait(false);
         return reply;
     }
@@ -323,7 +324,7 @@ public sealed class TelegramServiceImpl : TelegramService.TelegramServiceBase
                     Time = message.DateMs,
                 };
             },
-            "read_source",
+            TelegramOperations.ReadSource,
             context).ConfigureAwait(false);
         return reply;
     }
@@ -349,7 +350,7 @@ public sealed class TelegramServiceImpl : TelegramService.TelegramServiceBase
                 result.Results.AddRange(found.Select(DialogProtoMapper.ToEntry));
                 return result;
             },
-            "search",
+            TelegramOperations.Search,
             context).ConfigureAwait(false);
         return reply;
     }
@@ -371,7 +372,7 @@ public sealed class TelegramServiceImpl : TelegramService.TelegramServiceBase
                     .ConfigureAwait(false);
                 return new GetInfoReply { Info = DiscoveryProtoMapper.ToChannelInfo(info) };
             },
-            "discovery_info",
+            TelegramOperations.DiscoveryInfo,
             context).ConfigureAwait(false);
         return reply;
     }
@@ -393,7 +394,7 @@ public sealed class TelegramServiceImpl : TelegramService.TelegramServiceBase
                     .ConfigureAwait(false);
                 return DiscoveryProtoMapper.ToReadForEvalReply(result);
             },
-            "discovery_read",
+            TelegramOperations.DiscoveryRead,
             context).ConfigureAwait(false);
         return reply;
     }
@@ -414,7 +415,7 @@ public sealed class TelegramServiceImpl : TelegramService.TelegramServiceBase
                 await _discovery.JoinAsync(tenantId, normalizedUsername, ct).ConfigureAwait(false);
                 return true;
             },
-            "join",
+            TelegramOperations.Join,
             context).ConfigureAwait(false);
         return new JoinReply { Ok = true };
     }
@@ -434,7 +435,7 @@ public sealed class TelegramServiceImpl : TelegramService.TelegramServiceBase
                 await _discovery.LeaveAsync(tenantId, request.DialogId, ct).ConfigureAwait(false);
                 return true;
             },
-            "leave",
+            TelegramOperations.Leave,
             context).ConfigureAwait(false);
         return new LeaveReply { Ok = true };
     }
@@ -534,12 +535,12 @@ public sealed class TelegramServiceImpl : TelegramService.TelegramServiceBase
     private static string PhaseToString(AuthPhase phase)
         => phase switch
         {
-            AuthPhase.Phone => "phone",
-            AuthPhase.Code => "code",
-            AuthPhase.Password => "password",
-            AuthPhase.Qr => "qr",
-            AuthPhase.Ready => "ready",
-            _ => "idle",
+            AuthPhase.Phone => TelegramAuthPhases.Phone,
+            AuthPhase.Code => TelegramAuthPhases.Code,
+            AuthPhase.Password => TelegramAuthPhases.Password,
+            AuthPhase.Qr => TelegramAuthPhases.Qr,
+            AuthPhase.Ready => TelegramAuthPhases.Ready,
+            _ => TelegramAuthPhases.Idle,
         };
 
     // Доменная ошибка сессии → RpcException контракта (код + detail = текст причины).