diff --git a/sdk/python/README.md b/sdk/python/README.md
new file mode 100644
index 0000000..cb49889
--- /dev/null
+++ b/sdk/python/README.md
@@ -0,0 +1,300 @@
+# Telecom Platform Python SDK
+
+Async Python SDK for the Telecom Platform with full type hints and modern async/await support.
+
+## Features
+
+- **Async/Await Support**: Full async/await support with aiohttp
+- **Type Safety**: Complete type hints with Pydantic models
+- **WebSocket Support**: Real-time updates via WebSocket
+- **GraphQL Support**: Execute GraphQL queries
+- **Retry Logic**: Built-in retry mechanism with exponential backoff
+- **Error Handling**: Comprehensive error handling with custom exceptions
+- **Logging**: Optional debug logging
+- **Context Manager**: Async context manager support
+
+## Installation
+
+```bash
+pip install telecom-sdk
+```
+
+Or install from source:
+
+```bash
+git clone https://github.com/nutcas3/telecom-platform.git
+cd telecom-platform/sdk/python
+# Use uv for faster installation (recommended)
+uv pip install -r requirements.txt
+uv pip install -e .
+# Or traditional pip
+pip install -r requirements.txt
+pip install -e .
+```
+
+## Quick Start
+
+```python
+import asyncio
+from telecom_sdk import TelecomSDK
+
+async def main():
+    async with TelecomSDK(
+        api_url="http://localhost:8000",
+        api_key="your-api-key",
+        enable_logging=True
+    ) as sdk:
+        
+        # Get subscriber
+        subscriber = await sdk.get_subscriber(1)
+        print(f"Subscriber: {subscriber.first_name} {subscriber.last_name}")
+        
+        # Get usage stats
+        from datetime import datetime, timedelta
+        end_date = datetime.now()
+        start_date = end_date - timedelta(days=30)
+        
+        usage = await sdk.get_usage_stats(1, start_date, end_date)
+        print(f"Data usage: {usage.data_up + usage.data_down} bytes")
+        
+        # Create payment transaction
+        transaction = await sdk.create_payment_transaction(
+            subscriber_id=1,
+            amount=25.00,
+            currency="USD"
+        )
+        print(f"Transaction ID: {transaction.id}")
+
+if __name__ == "__main__":
+    asyncio.run(main())
+```
+
+## WebSocket Example
+
+```python
+import asyncio
+from telecom_sdk import TelecomSDK, WebSocketMessage
+
+async def handle_message(message: WebSocketMessage):
+    """Handle WebSocket messages."""
+    print(f"Received message type: {message.type}")
+    print(f"Message data: {message.data}")
+
+async def main():
+    sdk = TelecomSDK(api_url="http://localhost:8000")
+    
+    # Connect to WebSocket
+    await sdk.connect_websocket(handle_message)
+    
+    # Keep running
+    try:
+        while True:
+            await asyncio.sleep(1)
+    except KeyboardInterrupt:
+        await sdk.disconnect_websocket()
+
+if __name__ == "__main__":
+    asyncio.run(main())
+```
+
+## GraphQL Example
+
+```python
+import asyncio
+from telecom_sdk import TelecomSDK
+
+async def main():
+    async with TelecomSDK(api_url="http://localhost:8000") as sdk:
+        
+        query = """
+        query GetSubscribers($first: Int, $after: String) {
+            subscribers(first: $first, after: $after) {
+                edges {
+                    node {
+                        id
+                        firstName
+                        lastName
+                        email
+                        status
+                    }
+                }
+                pageInfo {
+                    hasNextPage
+                    endCursor
+                }
+            }
+        }
+        """
+        
+        variables = {"first": 10}
+        result = await sdk.execute_graphql_query(query, variables)
+        
+        for edge in result["data"]["subscribers"]["edges"]:
+            subscriber = edge["node"]
+            print(f"{subscriber['firstName']} {subscriber['lastName']}")
+
+if __name__ == "__main__":
+    asyncio.run(main())
+```
+
+## API Reference
+
+### Subscriber Management
+
+```python
+# Get subscriber
+subscriber = await sdk.get_subscriber(subscriber_id)
+
+# List subscribers
+subscribers = await sdk.list_subscribers(page=1, page_size=50, status="active")
+
+# Create subscriber
+subscriber = await sdk.create_subscriber(
+    imsi="208930000000001",
+    msisdn="+1234567890",
+    first_name="John",
+    last_name="Doe",
+    email="john.doe@example.com",
+    plan_id=1
+)
+
+# Update subscriber
+subscriber = await sdk.update_subscriber(subscriber_id, first_name="Jane")
+
+# Suspend subscriber
+subscriber = await sdk.suspend_subscriber(subscriber_id)
+
+# Activate subscriber
+subscriber = await sdk.activate_subscriber(subscriber_id)
+
+# Terminate subscriber
+success = await sdk.terminate_subscriber(subscriber_id)
+```
+
+### Usage Management
+
+```python
+from datetime import datetime, timedelta
+
+# Get usage stats
+usage = await sdk.get_usage_stats(
+    subscriber_id=1,
+    start_date=datetime.now() - timedelta(days=30),
+    end_date=datetime.now()
+)
+
+# List usage events
+events = await sdk.list_usage_events(
+    subscriber_id=1,
+    usage_type="data",
+    page=1,
+    page_size=50
+)
+
+# Get real-time usage
+realtime = await sdk.get_real_time_usage(subscriber_id)
+```
+
+### Payment Management
+
+```python
+# Create payment transaction
+transaction = await sdk.create_payment_transaction(
+    subscriber_id=1,
+    amount=25.00,
+    currency="USD",
+    gateway="stripe",
+    metadata={"description": "Monthly plan"}
+)
+
+# Get transaction
+transaction = await sdk.get_payment_transaction(transaction_id)
+
+# List transactions
+transactions = await sdk.list_payment_transactions(
+    subscriber_id=1,
+    status="completed"
+)
+```
+
+### System Management
+
+```python
+# Get system stats
+stats = await sdk.get_system_stats()
+
+# Get health status
+health = await sdk.get_health_status()
+```
+
+### Rating Plans
+
+```python
+# List rating plans
+plans = await sdk.list_rating_plans()
+
+# Get specific plan
+plan = await sdk.get_rating_plan(plan_id)
+```
+
+## Error Handling
+
+```python
+from telecom_sdk import TelecomSDK, AuthenticationError, APIError, NetworkError
+
+async def main():
+    try:
+        async with TelecomSDK(api_url="http://localhost:8000") as sdk:
+            subscriber = await sdk.get_subscriber(1)
+    except AuthenticationError:
+        print("Authentication failed")
+    except APIError as e:
+        print(f"API error: {e}")
+    except NetworkError as e:
+        print(f"Network error: {e}")
+    except TelecomError as e:
+        print(f"Telecom error: {e}")
+```
+
+## Configuration
+
+The SDK can be configured with the following options:
+
+- `api_url`: Base URL for the API server (default: "http://localhost:8000")
+- `api_key`: API key for authentication
+- `timeout`: Request timeout in seconds (default: 30)
+- `max_retries`: Maximum number of retry attempts (default: 3)
+- `retry_delay`: Delay between retries in seconds (default: 1.0)
+- `enable_logging`: Enable debug logging (default: False)
+
+## Development
+
+### Running Tests
+
+```bash
+# Install development dependencies
+pip install -r requirements-dev.txt
+
+# Run tests
+pytest tests/
+
+# Run tests with coverage
+pytest tests/ --cov=telecom_sdk
+```
+
+### Code Style
+
+```bash
+# Format code
+black telecom_sdk/
+
+# Lint code
+flake8 telecom_sdk/
+
+# Type checking
+mypy telecom_sdk/
+```
+
+## License
+
+This SDK is licensed under the MIT License.
diff --git a/sdk/python/requirements.txt b/sdk/python/requirements.txt
new file mode 100644
index 0000000..3b4550c
--- /dev/null
+++ b/sdk/python/requirements.txt
@@ -0,0 +1,6 @@
+# Install with: uv pip install -r requirements.txt
+# Or traditional: pip install -r requirements.txt
+aiohttp>=3.8.0
+websockets>=11.0.0
+pydantic>=2.0.0
+typing-extensions>=4.0.0
diff --git a/sdk/python/telecom_sdk/__init__.py b/sdk/python/telecom_sdk/__init__.py
new file mode 100644
index 0000000..97b3a2d
--- /dev/null
+++ b/sdk/python/telecom_sdk/__init__.py
@@ -0,0 +1,30 @@
+from .client import TelecomSDK
+from .types import (
+    Subscriber,
+    UsageStats,
+    PaymentTransaction,
+    SystemStats,
+    HealthStatus,
+    WebSocketMessage,
+)
+from .exceptions import (
+    TelecomError,
+    AuthenticationError,
+    APIError,
+    NetworkError,
+)
+
+__version__ = "1.0.0"
+__all__ = [
+    "TelecomSDK",
+    "Subscriber",
+    "UsageStats", 
+    "PaymentTransaction",
+    "SystemStats",
+    "HealthStatus",
+    "WebSocketMessage",
+    "TelecomError",
+    "AuthenticationError",
+    "APIError",
+    "NetworkError",
+]
diff --git a/sdk/python/telecom_sdk/client.py b/sdk/python/telecom_sdk/client.py
new file mode 100644
index 0000000..fad6700
--- /dev/null
+++ b/sdk/python/telecom_sdk/client.py
@@ -0,0 +1,422 @@
+import asyncio
+import json
+import logging
+from typing import Optional, Dict, Any, List, Union
+from datetime import datetime
+import aiohttp
+import websockets
+from websockets.exceptions import ConnectionClosed
+
+from .types import (
+    Subscriber,
+    UsageStats,
+    PaymentTransaction,
+    SystemStats,
+    HealthStatus,
+    WebSocketMessage,
+    UsageEvent,
+    RatingPlan,
+    RealTimeUsage,
+    PaginatedResponse,
+)
+from .exceptions import (
+    TelecomError,
+    AuthenticationError,
+    APIError,
+    NetworkError,
+    ValidationError,
+    RateLimitError,
+    ServerError,
+)
+
+
+class TelecomSDK:
+    
+    def __init__(
+        self,
+        api_url: str = "http://localhost:8000",
+        api_key: Optional[str] = None,
+        timeout: int = 30,
+        max_retries: int = 3,
+        retry_delay: float = 1.0,
+        enable_logging: bool = False,
+    ):
+        """
+        Initialize the Telecom SDK client.
+        
+        Args:
+            api_url: Base URL for the API server
+            api_key: API key for authentication
+            timeout: Request timeout in seconds
+            max_retries: Maximum number of retry attempts
+            retry_delay: Delay between retries in seconds
+            enable_logging: Enable debug logging
+        """
+        self.api_url = api_url.rstrip('/')
+        self.api_key = api_key
+        self.timeout = aiohttp.ClientTimeout(total=timeout)
+        self.max_retries = max_retries
+        self.retry_delay = retry_delay
+        self.enable_logging = enable_logging
+        
+        if enable_logging:
+            logging.basicConfig(level=logging.DEBUG)
+            self.logger = logging.getLogger(__name__)
+        else:
+            self.logger = logging.getLogger(__name__)
+            self.logger.disabled = True
+        
+        self._session: Optional[aiohttp.ClientSession] = None
+        self._websocket: Optional[websockets.WebSocketServerProtocol] = None
+    
+    async def __aenter__(self):
+        """Async context manager entry."""
+        await self._ensure_session()
+        return self
+    
+    async def __aexit__(self, exc_type, exc_val, exc_tb):
+        """Async context manager exit."""
+        await self.close()
+    
+    async def _ensure_session(self):
+        """Ensure aiohttp session is created."""
+        if self._session is None or self._session.closed:
+            headers = self._get_headers()
+            self._session = aiohttp.ClientSession(
+                headers=headers,
+                timeout=self.timeout,
+            )
+    
+    def _get_headers(self) -> Dict[str, str]:
+        """Get default headers for API requests."""
+        headers = {
+            "Content-Type": "application/json",
+            "User-Agent": f"Telecom-Python-SDK/1.0.0",
+        }
+        if self.api_key:
+            headers["Authorization"] = f"Bearer {self.api_key}"
+        return headers
+    
+    async def _make_request(
+        self,
+        method: str,
+        endpoint: str,
+        data: Optional[Dict[str, Any]] = None,
+        params: Optional[Dict[str, str]] = None,
+    ) -> Dict[str, Any]:
+        """
+        Make an HTTP request with retry logic.
+        
+        Args:
+            method: HTTP method
+            endpoint: API endpoint
+            data: Request body data
+            params: Query parameters
+            
+        Returns:
+            Response data as dictionary
+            
+        Raises:
+            TelecomError: On API errors
+        """
+        await self._ensure_session()
+        url = f"{self.api_url}{endpoint}"
+        
+        for attempt in range(self.max_retries + 1):
+            try:
+                self.logger.debug(f"Making {method} request to {url} (attempt {attempt + 1})")
+                
+                async with self._session.request(
+                    method=method,
+                    url=url,
+                    json=data,
+                    params=params,
+                ) as response:
+                    await self._handle_response_errors(response)
+                    return await response.json()
+                    
+            except aiohttp.ClientError as e:
+                if attempt == self.max_retries:
+                    raise NetworkError(f"Network error after {self.max_retries} retries: {e}")
+                
+                self.logger.warning(f"Request failed (attempt {attempt + 1}), retrying in {self.retry_delay}s: {e}")
+                await asyncio.sleep(self.retry_delay * (2 ** attempt))
+    
+    async def _handle_response_errors(self, response: aiohttp.ClientResponse):
+        """Handle HTTP response errors."""
+        if response.status == 401:
+            raise AuthenticationError("Authentication failed")
+        elif response.status == 429:
+            raise RateLimitError("Rate limit exceeded")
+        elif 400 <= response.status < 500:
+            error_data = await response.json().get("error", "Bad request")
+            raise APIError(f"API error: {error_data}", response.status)
+        elif response.status >= 500:
+            raise ServerError(f"Server error: {response.status}", response.status)
+    
+    # Subscriber Management
+    
+    async def get_subscriber(self, subscriber_id: int) -> Subscriber:
+        """Get subscriber by ID."""
+        response = await self._make_request("GET", f"/v1/subscribers/{subscriber_id}")
+        return Subscriber(**response)
+    
+    async def list_subscribers(
+        self,
+        page: int = 1,
+        page_size: int = 50,
+        status: Optional[str] = None,
+    ) -> PaginatedResponse:
+        """List subscribers with pagination."""
+        params = {"page": page, "page_size": page_size}
+        if status:
+            params["status"] = status
+        
+        response = await self._make_request("GET", "/v1/subscribers", params=params)
+        return PaginatedResponse(**response)
+    
+    async def create_subscriber(
+        self,
+        imsi: str,
+        msisdn: str,
+        first_name: str,
+        last_name: str,
+        email: str,
+        plan_id: int,
+        organization_id: Optional[str] = None,
+    ) -> Subscriber:
+        """Create a new subscriber."""
+        data = {
+            "imsi": imsi,
+            "msisdn": msisdn,
+            "first_name": first_name,
+            "last_name": last_name,
+            "email": email,
+            "plan_id": plan_id,
+        }
+        if organization_id:
+            data["organization_id"] = organization_id
+        
+        response = await self._make_request("POST", "/v1/subscribers", data=data)
+        return Subscriber(**response)
+    
+    async def update_subscriber(
+        self,
+        subscriber_id: int,
+        **kwargs,
+    ) -> Subscriber:
+        """Update subscriber details."""
+        response = await self._make_request(
+            "PUT",
+            f"/v1/subscribers/{subscriber_id}",
+            data=kwargs,
+        )
+        return Subscriber(**response)
+    
+    async def suspend_subscriber(self, subscriber_id: int) -> Subscriber:
+        """Suspend a subscriber."""
+        response = await self._make_request("POST", f"/v1/subscribers/{subscriber_id}/suspend")
+        return Subscriber(**response)
+    
+    async def activate_subscriber(self, subscriber_id: int) -> Subscriber:
+        """Activate a suspended subscriber."""
+        response = await self._make_request("POST", f"/v1/subscribers/{subscriber_id}/activate")
+        return Subscriber(**response)
+    
+    async def terminate_subscriber(self, subscriber_id: int) -> bool:
+        """Terminate a subscriber."""
+        response = await self._make_request("DELETE", f"/v1/subscribers/{subscriber_id}")
+        return response.get("success", False)
+    
+    # Usage Management
+    
+    async def get_usage_stats(
+        self,
+        subscriber_id: int,
+        start_date: datetime,
+        end_date: datetime,
+    ) -> UsageStats:
+        """Get usage statistics for a subscriber."""
+        params = {
+            "start_date": start_date.isoformat(),
+            "end_date": end_date.isoformat(),
+        }
+        response = await self._make_request(
+            "GET",
+            f"/v1/subscribers/{subscriber_id}/usage",
+            params=params,
+        )
+        return UsageStats(**response)
+    
+    async def list_usage_events(
+        self,
+        subscriber_id: Optional[int] = None,
+        usage_type: Optional[str] = None,
+        start_date: Optional[datetime] = None,
+        end_date: Optional[datetime] = None,
+        page: int = 1,
+        page_size: int = 50,
+    ) -> PaginatedResponse:
+        """List usage events with filtering."""
+        params = {"page": page, "page_size": page_size}
+        
+        if subscriber_id:
+            params["subscriber_id"] = subscriber_id
+        if usage_type:
+            params["usage_type"] = usage_type
+        if start_date:
+            params["start_date"] = start_date.isoformat()
+        if end_date:
+            params["end_date"] = end_date.isoformat()
+        
+        response = await self._make_request("GET", "/v1/usage/events", params=params)
+        return PaginatedResponse(**response)
+    
+    async def get_real_time_usage(self, subscriber_id: int) -> RealTimeUsage:
+        """Get real-time usage for a subscriber."""
+        response = await self._make_request("GET", f"/v1/subscribers/{subscriber_id}/realtime")
+        return RealTimeUsage(**response)
+    
+    # Payment Management
+    
+    async def create_payment_transaction(
+        self,
+        subscriber_id: int,
+        amount: float,
+        currency: str = "USD",
+        gateway: str = "stripe",
+        metadata: Optional[Dict[str, Any]] = None,
+    ) -> PaymentTransaction:
+        """Create a payment transaction."""
+        data = {
+            "subscriber_id": subscriber_id,
+            "amount": amount,
+            "currency": currency,
+            "gateway": gateway,
+        }
+        if metadata:
+            data["metadata"] = metadata
+        
+        response = await self._make_request("POST", "/v1/payments/transactions", data=data)
+        return PaymentTransaction(**response)
+    
+    async def get_payment_transaction(self, transaction_id: str) -> PaymentTransaction:
+        """Get payment transaction by ID."""
+        response = await self._make_request("GET", f"/v1/payments/transactions/{transaction_id}")
+        return PaymentTransaction(**response)
+    
+    async def list_payment_transactions(
+        self,
+        subscriber_id: Optional[int] = None,
+        status: Optional[str] = None,
+        page: int = 1,
+        page_size: int = 50,
+    ) -> PaginatedResponse:
+        """List payment transactions with filtering."""
+        params = {"page": page, "page_size": page_size}
+        
+        if subscriber_id:
+            params["subscriber_id"] = subscriber_id
+        if status:
+            params["status"] = status
+        
+        response = await self._make_request("GET", "/v1/payments/transactions", params=params)
+        return PaginatedResponse(**response)
+    
+    # Rating Plans
+    
+    async def list_rating_plans(self) -> List[RatingPlan]:
+        """List all available rating plans."""
+        response = await self._make_request("GET", "/v1/rating-plans")
+        return [RatingPlan(**plan) for plan in response]
+    
+    async def get_rating_plan(self, plan_id: str) -> RatingPlan:
+        """Get rating plan by ID."""
+        response = await self._make_request("GET", f"/v1/rating-plans/{plan_id}")
+        return RatingPlan(**response)
+    
+    # System Management
+    
+    async def get_system_stats(self) -> SystemStats:
+        """Get system statistics."""
+        response = await self._make_request("GET", "/v1/system/stats")
+        return SystemStats(**response)
+    
+    async def get_health_status(self) -> HealthStatus:
+        """Get system health status."""
+        response = await self._make_request("GET", "/v1/health")
+        return HealthStatus(**response)
+    
+    # WebSocket Support
+    
+    async def connect_websocket(self, message_handler: callable) -> None:
+        """
+        Connect to WebSocket for real-time updates.
+        
+        Args:
+            message_handler: Async function to handle WebSocket messages
+        """
+        ws_url = self.api_url.replace("http://", "ws://") + "/ws"
+        
+        try:
+            self._websocket = await websockets.connect(ws_url)
+            self.logger.info("WebSocket connected")
+            
+            async for message in self._websocket:
+                try:
+                    data = json.loads(message)
+                    ws_message = WebSocketMessage(**data)
+                    await message_handler(ws_message)
+                except json.JSONDecodeError as e:
+                    self.logger.error(f"Failed to decode WebSocket message: {e}")
+                except Exception as e:
+                    self.logger.error(f"Error handling WebSocket message: {e}")
+                    
+        except ConnectionClosed:
+            self.logger.warning("WebSocket connection closed")
+        except Exception as e:
+            self.logger.error(f"WebSocket error: {e}")
+            raise NetworkError(f"WebSocket connection failed: {e}")
+    
+    async def disconnect_websocket(self) -> None:
+        """Disconnect from WebSocket."""
+        if self._websocket:
+            await self._websocket.close()
+            self._websocket = None
+            self.logger.info("WebSocket disconnected")
+    
+    # GraphQL Support
+    
+    async def execute_graphql_query(
+        self,
+        query: str,
+        variables: Optional[Dict[str, Any]] = None,
+    ) -> Dict[str, Any]:
+        """
+        Execute a GraphQL query.
+        
+        Args:
+            query: GraphQL query string
+            variables: Optional variables for the query
+            
+        Returns:
+            GraphQL response data
+        """
+        data = {"query": query}
+        if variables:
+            data["variables"] = variables
+        
+        response = await self._make_request("POST", "/graphql", data=data)
+        return response
+    
+    # Utility Methods
+    
+    async def close(self) -> None:
+        """Close the SDK client and cleanup resources."""
+        if self._websocket:
+            await self.disconnect_websocket()
+        
+        if self._session and not self._session.closed:
+            await self._session.close()
+        
+        self.logger.info("Telecom SDK client closed")
diff --git a/sdk/python/telecom_sdk/exceptions.py b/sdk/python/telecom_sdk/exceptions.py
new file mode 100644
index 0000000..12c08f5
--- /dev/null
+++ b/sdk/python/telecom_sdk/exceptions.py
@@ -0,0 +1,31 @@
+class TelecomError(Exception):
+    """Base exception for all Telecom SDK errors."""
+    
+    def __init__(self, message: str, status_code: Optional[int] = None, response_data: Optional[dict] = None):
+        super().__init__(message)
+        self.status_code = status_code
+        self.response_data = response_data or {}
+
+
+class AuthenticationError(TelecomError):
+    pass
+
+
+class APIError(TelecomError):
+    pass
+
+
+class NetworkError(TelecomError):
+    pass
+
+
+class ValidationError(TelecomError):
+    pass
+
+
+class RateLimitError(TelecomError):
+    pass
+
+
+class ServerError(TelecomError):
+    pass
diff --git a/sdk/python/telecom_sdk/types.py b/sdk/python/telecom_sdk/types.py
new file mode 100644
index 0000000..9462e19
--- /dev/null
+++ b/sdk/python/telecom_sdk/types.py
@@ -0,0 +1,141 @@
+from typing import Optional, Dict, Any, List
+from datetime import datetime
+from pydantic import BaseModel, Field
+from enum import Enum
+
+class SubscriberStatus(str, Enum):
+    ACTIVE = "active"
+    SUSPENDED = "suspended"
+    TERMINATED = "terminated"
+
+class UsageType(str, Enum):
+    DATA = "data"
+    VOICE = "voice"
+    SMS = "sms"
+
+
+class PaymentStatus(str, Enum):
+    PENDING = "pending"
+    COMPLETED = "completed"
+    FAILED = "failed"
+    REFUNDED = "refunded"
+
+
+class Subscriber(BaseModel):
+    id: int
+    imsi: str
+    msisdn: str
+    first_name: str
+    last_name: str
+    email: str
+    organization_id: Optional[str] = None
+    status: SubscriberStatus
+    plan_id: int
+    balance: float = Field(ge=0.0)
+    created_at: datetime
+    updated_at: datetime
+    
+    class Config:
+        use_enum_values = True
+
+
+class UsageStats(BaseModel):
+    subscriber_id: str
+    data_up: int = Field(ge=0)
+    data_down: int = Field(ge=0)
+    voice_seconds: int = Field(ge=0)
+    sms_count: int = Field(ge=0)
+    period_start: datetime
+    period_end: datetime
+    cost: float = Field(ge=0.0)
+
+
+class PaymentTransaction(BaseModel):
+    id: str
+    subscriber_id: str
+    amount: float = Field(ge=0.0)
+    currency: str = Field(min_length=3, max_length=3)
+    status: PaymentStatus
+    gateway: str
+    transaction_id: Optional[str] = None
+    created_at: datetime
+    completed_at: Optional[datetime] = None
+    metadata: Optional[Dict[str, Any]] = None
+
+
+class SystemStats(BaseModel):
+    active_sessions: int = Field(ge=0)
+    total_accounts: int = Field(ge=0)
+    blocked_users: int = Field(ge=0)
+    low_balance_alerts: int = Field(ge=0)
+    uptime: float = Field(ge=0.0)
+    cpu_usage: float = Field(ge=0.0, le=100.0)
+    memory_usage: float = Field(ge=0.0, le=100.0)
+
+
+class HealthStatus(BaseModel):
+    status: str  # "healthy", "degraded", "unhealthy"
+    timestamp: datetime
+    checks: Dict[str, Dict[str, Any]]
+    uptime: float = Field(ge=0.0)
+
+
+class WebSocketMessage(BaseModel):
+    type: str
+    data: Dict[str, Any]
+    timestamp: datetime
+
+
+class UsageEvent(BaseModel):
+    id: str
+    subscriber_id: str
+    usage_type: UsageType
+    amount: int = Field(ge=0)
+    cost: float = Field(ge=0.0)
+    timestamp: datetime
+    metadata: Optional[Dict[str, Any]] = None
+
+
+class RatingPlan(BaseModel):
+    plan_id: str
+    name: str
+    data_rate: float = Field(ge=0.0)
+    voice_rate: float = Field(ge=0.0)
+    sms_rate: float = Field(ge=0.0)
+    monthly_fee: float = Field(ge=0.0)
+    data_limit: int = Field(ge=0)
+    voice_limit: int = Field(ge=0)
+    sms_limit: int = Field(ge=0)
+
+
+class CurrentSession(BaseModel):
+    session_id: str
+    start_time: datetime
+    data_up: int = Field(ge=0)
+    data_down: int = Field(ge=0)
+    voice_seconds: int = Field(ge=0)
+    sms_count: int = Field(ge=0)
+
+
+class RealTimeUsage(BaseModel):
+    """Real-time usage model."""
+    current_session: Optional[CurrentSession] = None
+    today_usage: Optional[Dict[str, int]] = None
+
+
+class APIResponse(BaseModel):
+    """Generic API response model."""
+    success: bool
+    data: Optional[Any] = None
+    error: Optional[str] = None
+    message: Optional[str] = None
+
+
+class PaginatedResponse(BaseModel):
+    """Paginated response model."""
+    items: List[Any]
+    total: int = Field(ge=0)
+    page: int = Field(ge=1)
+    page_size: int = Field(ge=1, le=100)
+    has_next: bool
+    has_prev: bool