diff --git a/api/main.py b/api/main.py
index cf4ace22..31189984 100644
--- a/api/main.py
+++ b/api/main.py
@@ -3,7 +3,7 @@ from api.routes import users, keys, coupons, servers, tariffs, gifts, referrals,
 
 app = FastAPI(
     title="SoloBot API (preAlpha)",
-    version="0.1.2",
+    version="0.2.0",
     docs_url="/api/docs",           
     redoc_url="/api/redoc",         
     openapi_url="/api/openapi.json" 
diff --git a/api/routes/keys.py b/api/routes/keys.py
index bd0166ff..98d4be8e 100644
--- a/api/routes/keys.py
+++ b/api/routes/keys.py
@@ -1,16 +1,16 @@
-from fastapi import Depends, HTTPException, Path, Body
+from fastapi import Depends, HTTPException, Path, Body, status
 from sqlalchemy.ext.asyncio import AsyncSession
 from sqlalchemy import select
 from datetime import datetime
 
 from database.models import Key, Admin, Tariff
-from api.schemas.keys import KeyBase, KeyResponse, KeyUpdate
+from api.schemas.keys import KeyBase, KeyResponse, KeyUpdate, KeyCreateRequest
 from api.routes.base_crud import generate_crud_router
 from api.depends import get_session, verify_admin_token
 from handlers.keys.key_utils import delete_key_from_cluster
 from logger import logger
 
-from handlers.keys.key_utils import renew_key_in_cluster
+from handlers.keys.key_utils import renew_key_in_cluster, create_key_on_cluster
 
 router = generate_crud_router(
     model=Key,
@@ -119,3 +119,32 @@ async def edit_key_by_email(
     except Exception as e:
         logger.error(f"[API] Ошибка при обновлении ключа: {e}")
         raise HTTPException(status_code=500, detail="Ошибка при обновлении ключа")
+
+
+@router.post("/create", response_model=dict, status_code=status.HTTP_201_CREATED)
+async def create_key_api(
+    payload: KeyCreateRequest = Body(...),
+    session: AsyncSession = Depends(get_session),
+    admin: Admin = Depends(verify_admin_token),
+):
+    logger.info(f"[API] Запрос на создание ключа: {payload.dict()}")
+
+    try:
+        await create_key_on_cluster(
+            cluster_id=payload.cluster_id,
+            tg_id=payload.tg_id,
+            client_id=payload.client_id,
+            email=payload.email or f"{payload.tg_id}_key",
+            expiry_timestamp=payload.expiry_timestamp,
+            plan=payload.tariff_id,
+            session=session,
+            remnawave_link=payload.remnawave_link,
+            hwid_limit=payload.hwid_limit,
+            traffic_limit_bytes=payload.traffic_limit_bytes,
+            is_trial=payload.is_trial or False,
+        )
+        return {"message": "Ключ успешно создан"}
+
+    except Exception as e:
+        logger.error(f"[API] Ошибка при создании ключа: {e}")
+        raise HTTPException(status_code=500, detail="Ошибка при создании ключа")
\ No newline at end of file
diff --git a/api/schemas/coupons.py b/api/schemas/coupons.py
index 98a1669a..b81fb08f 100644
--- a/api/schemas/coupons.py
+++ b/api/schemas/coupons.py
@@ -13,10 +13,12 @@ class CouponBase(BaseModel):
 
     @model_validator(mode="after")
     def check_exactly_one_of_amount_or_days(self) -> "CouponBase":
-        has_amount = getattr(self, "amount", None) is not None
-        has_days = getattr(self, "days", None) is not None
+        has_amount = self.amount not in (None, 0)
+        has_days = self.days is not None
 
-        if has_amount == has_days:
+        if has_amount and has_days:
+            raise ValueError("Coupon must have exactly one of: 'amount' or 'days'")
+        if not has_amount and not has_days:
             raise ValueError("Coupon must have exactly one of: 'amount' or 'days'")
         return self
 
diff --git a/api/schemas/keys.py b/api/schemas/keys.py
index fdc181d2..c4d821f9 100644
--- a/api/schemas/keys.py
+++ b/api/schemas/keys.py
@@ -1,4 +1,4 @@
-from pydantic import BaseModel
+from pydantic import BaseModel, Field
 from typing import Optional
 
 
@@ -63,9 +63,15 @@ class KeyUpdate(BaseModel):
 
 
 class KeyCreateRequest(BaseModel):
-    tg_id: int
-    cluster_id: str
-    tariff_id: int
-    email: Optional[str] = None
-    alias: Optional[str] = None
-    remnawave_link: Optional[str] = None
\ No newline at end of file
+    tg_id: int = Field(..., description="Telegram ID пользователя")
+    cluster_id: str = Field(..., description="Имя кластера или сервера")
+    tariff_id: int = Field(..., description="ID тарифа из базы данных")
+    client_id: str = Field(..., description="UUID клиента (уникальный)")
+    expiry_timestamp: int = Field(..., description="Срок окончания в миллисекундах")
+    
+    email: Optional[str] = Field(None, description="Условное имя подписки")
+    alias: Optional[str] = Field(None, description="пользовательское имя")
+    remnawave_link: Optional[str] = Field(None, description="Ссылка на подписку Remnawave")
+    hwid_limit: Optional[int] = Field(None, description="Ограничение по HWID")
+    traffic_limit_bytes: Optional[int] = Field(None, description="Ограничение трафика в байтах")
+    is_trial: Optional[bool] = Field(False, description="Флаг триального ключа")
\ No newline at end of file
diff --git a/handlers/admin/sender/sender_handler.py b/handlers/admin/sender/sender_handler.py
index e90e2780..540ac1e2 100644
--- a/handlers/admin/sender/sender_handler.py
+++ b/handlers/admin/sender/sender_handler.py
@@ -6,6 +6,7 @@ from aiogram import F, Router
 from aiogram.fsm.context import FSMContext
 from aiogram.fsm.state import State, StatesGroup
 from aiogram.types import CallbackQuery, Message, InlineKeyboardMarkup, InlineKeyboardButton
+from aiogram.exceptions import TelegramBadRequest
 from sqlalchemy import distinct, func, select
 from sqlalchemy.ext.asyncio import AsyncSession
 
@@ -84,10 +85,16 @@ def parse_message_buttons(text: str) -> tuple[str, InlineKeyboardMarkup | None]:
     IsAdminFilter(),
 )
 async def handle_sender(callback_query: CallbackQuery):
-    await callback_query.message.edit_text(
-        text="✍️ Выберите группу пользователей для рассылки:",
-        reply_markup=build_sender_kb(),
-    )
+    try:
+        await callback_query.message.edit_text(
+            text="✍️ Выберите группу пользователей для рассылки:",
+            reply_markup=build_sender_kb(),
+        )
+    except TelegramBadRequest as e:
+        if "message is not modified" in str(e):
+            logger.debug("[Sender] Сообщение не изменено, Telegram отклонил редактирование")
+        else:
+            raise
 
 
 @router.callback_query(
diff --git a/handlers/admin/users/users_handler.py b/handlers/admin/users/users_handler.py
index 7c9a9886..36fca181 100644
--- a/handlers/admin/users/users_handler.py
+++ b/handlers/admin/users/users_handler.py
@@ -1341,7 +1341,7 @@ async def change_expiry_time(
         tariff = result.first()
         if tariff:
             traffic_limit = int(tariff[0]) if tariff[0] is not None else 0
-            device_limit = int(tariff[1]) if tariff[1] is not None else None
+            device_limit = int(tariff[1]) if tariff[1] is not None else 0
 
     servers = await get_servers(session=session)
 
diff --git a/handlers/coupons.py b/handlers/coupons.py
index c260fa4f..9c8dcc8f 100644
--- a/handlers/coupons.py
+++ b/handlers/coupons.py
@@ -235,7 +235,7 @@ async def handle_key_extension(
         if key.tariff_id:
             tariff = await get_tariff_by_id(session, key.tariff_id)
         total_gb = int(tariff["traffic_limit"]) if tariff and tariff.get("traffic_limit") else 0
-        device_limit = int(tariff["device_limit"]) if tariff and tariff.get("device_limit") else None
+        device_limit = int(tariff["device_limit"]) if tariff and tariff.get("device_limit") else 0
 
         await renew_key_in_cluster(
             cluster_id=key.server_id,
diff --git a/handlers/keys/key_mode/key_cluster_mode.py b/handlers/keys/key_mode/key_cluster_mode.py
index 81a72635..8070d73b 100644
--- a/handlers/keys/key_mode/key_cluster_mode.py
+++ b/handlers/keys/key_mode/key_cluster_mode.py
@@ -79,7 +79,7 @@ async def key_cluster_mode(
         is_trial = data.get("is_trial", False)
 
         device_limit = 0
-        traffic_limit_gb = None
+        traffic_limit_gb = 0
 
         if is_trial:
             device_limit = TRIAL_CONFIG.get("hwid_limit", 0)
diff --git a/handlers/keys/key_utils.py b/handlers/keys/key_utils.py
index 4a0d726e..915e87f3 100644
--- a/handlers/keys/key_utils.py
+++ b/handlers/keys/key_utils.py
@@ -132,6 +132,7 @@ async def create_key_on_cluster(
                         user_data["shortUuid"] = short_uuid
                     if hwid_limit is not None:
                         user_data["hwidDeviceLimit"] = hwid_limit
+                    logger.info(f"[Key Creation] Данные для создания клиента в Remnawave: {user_data}")
 
                     result = await remna.create_user(user_data)
                     if not result:
@@ -236,7 +237,7 @@ async def create_client_on_server(
             sub_id = unique_email
 
         total_gb_value = 0
-        device_limit_value = None
+        device_limit_value = 0
 
         if is_trial:
             total_gb_value = TRIAL_CONFIG.get("traffic_limit_gb", 0)