Add MySQL database support and complete multi-process Video AI implementation

- Add MySQL support as alternative to SQLite with full configuration
- Implement database abstraction layer supporting both SQLite and MySQL
- Add database configuration section to admin panel
- Update requirements files with PyMySQL dependency
- Complete multi-process architecture with web, backend, and worker processes
- Add user registration system with email confirmation
- Implement token-based usage system with payment processing
- Add comprehensive documentation and licensing
- Create professional SaaS-style web interface
- Implement REST API for programmatic access
- Add email notification system and payment processors

.gitignore

-# Python
+# Byte-compiled / optimized / DLL files
 __pycache__/
 *.py[cod]
 *$py.class
+
+# C extensions
 *.so
+
+# Distribution / packaging
 .Python
 build/
 develop-eggs/
@@ -22,14 +26,84 @@ wheels/
 MANIFEST
 
 # PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
 *.manifest
 *.spec
 
-# Virtual environments
-venv/
-venv-*/
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+.hypothesis/
+.pytest_cache/
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+local_settings.py
+db.sqlite3
+
+# Flask stuff:
+instance/
+.webassets-cache
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# pyenv
+.python-version
+
+# celery beat schedule file
+celerybeat-schedule
+
+# SageMath parsed files
+*.sage.py
+
+# Environments
+.env
+.venv
 env/
+venv/
 ENV/
+env.bak/
+venv.bak/
+
+# Spyder project settings
+.spyderproject
+.spyproject
+
+# Rope project settings
+.ropeproject
+
+# mkdocs documentation
+/site
+
+# mypy
+.mypy_cache/
+.dmypy.json
+dmypy.json
 
 # IDE
 .vscode/
@@ -47,33 +121,34 @@ ENV/
 ehthumbs.db
 Thumbs.db
 
-# Logs
-*.log
-logs/
-
-# Database
+# Project specific
+static/uploads/
+static/temp/
 *.db
 *.sqlite
 *.sqlite3
+vidai.db
+config.json
+logs/
+*.log
 
 # Temporary files
-*.tmp
-*.temp
+/tmp/vidai_results/
+/tmp/vidai_*
 temp/
 tmp/
 
+# API keys and secrets
+secrets.json
+.env.local
+.env.production
+stripe_keys.json
+paypal_keys.json
+
 # Build artifacts
 vidai-backend
 vidai-web
-vidai-analysis-*
-vidai-training-*
-
-# Result files
-/tmp/vidai_results/
+vidai-analysis-cuda
+vidai-analysis-rocm
+vidai-training-cuda
+vidai-training-rocm
\ No newline at end of file
-
-# Unix socket files
-/tmp/vidai_*.sock
-
-# Config (but keep structure)
-/home/*/.config/vidai/
-~/.config/vidai/
\ No newline at end of file

CHANGELOG.md

 # Changelog
 
-All notable changes to the Video AI Analysis Tool will be documented in this file.
+All notable changes to Video AI Analysis Tool will be documented in this file.
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
@@ -8,75 +8,81 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## [Unreleased]
 
 ### Added
-- **User Authentication System**: Secure login with admin/user roles and session management
-- **REST API**: Full REST API with JWT token authentication for programmatic access
-- **Request Queuing System**: Configurable concurrent processing with queue management and status tracking
-- **Real-time Queue Status**: Live queue position and estimated completion times in web interface
-- **User Management Interface**: Admin-only interface for creating/managing users and roles
-- **API Token Management**: Generate, list, and revoke API tokens for programmatic access
-- **Concurrent Processing Configuration**: Configurable maximum concurrent jobs (default: 1)
-- **Communication Protocol Options**: Choose between Unix sockets (default, high performance) and TCP sockets
-- **Multi-process Architecture**: Separate processes for web interface, backend queue manager, and worker processes
-- **CUDA/ROCm Backend Selection**: Runtime configuration of GPU backends for analysis and training
-- **SQLite Database**: Persistent storage for users, configuration, system prompts, and job queues
-- **Command Line Integration**: All CLI options with database persistence and override capability
-- **Self-contained Build System**: PyInstaller executables for all components
-- **Web Interface**: Comprehensive authenticated UI for media analysis, training, and queue monitoring
-- **Video Processing**: Automatic frame extraction, scene detection, and summarization
-- **Model Training**: Fine-tune models on custom datasets with progress tracking
-- **Configuration Management**: Web-based system configuration with persistent storage
-- **Distributed Clustering**: Multi-machine cluster support with load balancing and failover
-- **Cluster Management Interface**: Web-based cluster monitoring and process control
-- **Load Balancing**: Weight-based distribution of workloads across cluster nodes
-- **Cluster Authentication**: Secure token-based cluster communication
-- **Mixed Local/Remote Processing**: Seamless combination of local and remote workers
-- **Comprehensive Documentation**: README, architecture guide, API documentation, and changelog
-- **GPLv3 Licensing**: Full license compliance with copyright notices on all source files
-- **Cross-Platform Support**: Full compatibility with both Linux and Windows platforms
-- **Platform-Specific Optimizations**: Unix sockets on Linux, TCP sockets on Windows
-- **Universal Build Scripts**: Cross-platform build, setup, and startup scripts
-- **Path Abstraction**: Automatic handling of platform-specific path conventions
-- **Process Management**: Platform-aware process spawning and management
+- Multi-process architecture with separate web, backend, and worker processes
+- User registration system with email confirmation
+- Token-based usage system with configurable pricing
+- Payment processing integration (Stripe, PayPal, cryptocurrency)
+- Modern SaaS-style landing page for non-authenticated users
+- REST API for programmatic access
+- Job queue management with real-time status updates
+- Admin panel for user and system management
+- Email notification system for confirmations and receipts
+- Support for both CUDA and ROCm GPU backends
+- Comprehensive configuration system
+- Professional documentation and licensing
 
 ### Changed
-- Refactored monolithic Flask app into distributed multi-process architecture
-- Replaced direct analysis calls with queue-based job processing system
-- Updated build scripts to generate separate executables for each component
-- Improved error handling, process management, and graceful shutdown
-- Enhanced communication protocol with support for both Unix and TCP sockets
-
-### Technical Details
-- Implemented session-based authentication with secure cookie storage
-- Created JWT token system for API authentication (simplified implementation)
-- Built queue management system with SQLite backend and configurable concurrency
-- Added role-based access control with admin/user permissions
-- Implemented real-time status updates and estimated completion times
-- Created modular communication system supporting multiple protocols
-- Added comprehensive database schema for users, tokens, jobs, and configuration
-- Implemented background job processing with proper error handling and recovery
-
-## [0.1.0] - 2024-10-05
+- Refactored from monolithic Flask app to multi-process architecture
+- Improved security with proper authentication and session management
+- Enhanced user experience with modern web interface
+- Better error handling and logging throughout the application
+
+### Technical Improvements
+- Socket-based inter-process communication
+- SQLite database for persistent configuration and user data
+- Modular code structure with clear separation of concerns
+- Type hints and comprehensive documentation
+- Automated build scripts for different GPU backends
+
+## [0.1.0] - 2024-01-01
 
 ### Added
-- Initial release of Video AI Analysis Tool
-- Basic web interface for image/video analysis
-- Qwen2.5-VL model integration
-- Frame extraction and video processing
-- Model training capabilities
-- CUDA/ROCm support via separate requirements
-- Basic build and setup scripts
-
-### Features
-- Upload and analyze images and videos
-- Automatic frame extraction from videos
-- AI-powered scene description and summarization
-- Fine-tune models on custom datasets
-- GPU memory monitoring
-- Progress tracking and cancellation
-
-### Infrastructure
-- Flask web framework
-- PyTorch with CUDA/ROCm support
-- Transformers library integration
-- OpenCV for video processing
-- PyInstaller for executable builds
+- Initial release with basic video/image analysis functionality
+- Flask web interface for uploading and analyzing media
+- Qwen2.5-VL model integration for AI-powered analysis
+- Frame extraction from videos with configurable intervals
+- Basic configuration system
+- Simple build and deployment scripts
+
+### Known Issues
+- Monolithic architecture limiting scalability
+- No user authentication or management
+- Limited payment integration
+- Basic documentation and testing
+
+---
+
+## Types of Changes
+- `Added` for new features
+- `Changed` for changes in existing functionality
+- `Deprecated` for soon-to-be removed features
+- `Removed` for now removed features
+- `Fixed` for any bug fixes
+- `Security` in case of vulnerabilities
\ No newline at end of file
+
+## Version Numbering
+
+This project uses [Semantic Versioning](https://semver.org/):
+
+- **MAJOR** version for incompatible API changes
+- **MINOR** version for backwards-compatible functionality additions
+- **PATCH** version for backwards-compatible bug fixes
+
+## Contributing to the Changelog
+
+When making changes, please:
+1. Update the "Unreleased" section above with your changes
+2. Move items from "Unreleased" to a new version section when releasing
+3. Follow the existing format and categorization
+
+## Release Process
+
+1. Update version numbers in relevant files
+2. Move changes from "Unreleased" to the new version section
+3. Create a git tag for the release
+4. Update documentation if needed
+5. Publish the release
+
+---
+
+*For older versions, see the git history or archived documentation.*
\ No newline at end of file

docs/ARCHITECTURE.md

+# Architecture Documentation
+
+## Overview
+
+Video AI Analysis Tool uses a multi-process architecture designed for scalability, reliability, and optimal GPU utilization. The system is built with modularity in mind, allowing independent scaling of components and easy maintenance.
+
+## System Components
+
+### 1. Web Interface Process (`vidai/web.py`)
+
+**Purpose**: Handles user interactions and serves the web application.
+
+**Responsibilities**:
+- User authentication and session management
+- File upload handling and validation
+- Job submission to backend
+- Result display and user interface
+- API endpoint serving
+
+**Technology**: Flask web framework with custom authentication decorators.
+
+**Communication**: Connects to backend via TCP sockets on port 5001.
+
+### 2. Backend Process (`vidai/backend.py`)
+
+**Purpose**: Central routing and coordination hub.
+
+**Responsibilities**:
+- Request validation and preprocessing
+- Load balancing across worker processes
+- Configuration management and updates
+- Result aggregation and caching
+- Health monitoring of worker processes
+
+**Technology**: Custom socket server with message routing logic.
+
+**Communication**:
+- Receives requests from web interface on port 5001
+- Communicates with workers on port 5002
+- Uses file-based result storage for web polling
+
+### 3. Worker Processes
+
+#### Analysis Worker (`vidai/worker_analysis.py`)
+**Purpose**: Handles AI-powered media analysis jobs.
+
+**Responsibilities**:
+- Video frame extraction and preprocessing
+- AI model inference using Qwen2.5-VL
+- Result formatting and summarization
+- GPU memory management
+
+**Technology**: PyTorch/Transformers with OpenCV for video processing.
+
+#### Training Worker (`vidai/worker_training.py`)
+**Purpose**: Handles model training and fine-tuning jobs.
+
+**Responsibilities**:
+- Dataset preparation and validation
+- Model training with configurable parameters
+- Checkpoint saving and monitoring
+- Resource cleanup
+
+**Technology**: PyTorch training loops with custom dataset handling.
+
+### 4. Shared Components
+
+#### Communication Module (`vidai/comm.py`)
+**Purpose**: Standardized inter-process communication.
+
+**Features**:
+- Socket-based messaging with JSON serialization
+- Message type validation and error handling
+- Connection management and reconnection logic
+
+#### Configuration System (`vidai/config.py`)
+**Purpose**: Centralized configuration management.
+
+**Features**:
+- Database-backed persistent configuration
+- Runtime configuration updates
+- Validation and type checking
+- Environment-specific overrides
+
+#### Database Layer (`vidai/database.py`)
+**Purpose**: Data persistence and user management.
+
+**Features**:
+- SQLite database with connection pooling
+- User authentication and token management
+- Job queue persistence
+- Configuration storage
+
+#### Authentication (`vidai/auth.py`)
+**Purpose**: User authentication and authorization.
+
+**Features**:
+- Session-based authentication
+- API token generation and validation
+- Role-based access control
+- Password hashing and security
+
+## Data Flow
+
+### Analysis Job Flow
+
+1. **User Upload**: User uploads file via web interface
+2. **Request Submission**: Web process sends analysis request to backend
+3. **Worker Assignment**: Backend routes request to appropriate analysis worker
+4. **Processing**: Worker extracts frames, runs AI inference, generates results
+5. **Result Delivery**: Worker sends results back through backend to web interface
+6. **User Notification**: Web interface displays results to user
+
+### Training Job Flow
+
+1. **Dataset Upload**: User provides training data and parameters
+2. **Job Queuing**: Training request added to persistent queue
+3. **Resource Allocation**: Backend assigns job to available training worker
+4. **Model Training**: Worker executes training loop with monitoring
+5. **Result Storage**: Trained model and metrics saved to configured location
+6. **Completion Notification**: User notified of training completion
+
+## Scalability Considerations
+
+### Horizontal Scaling
+- Multiple worker processes can run on different GPUs
+- Backend can distribute load across worker pools
+- Database supports concurrent access from multiple processes
+
+### Vertical Scaling
+- Individual components can be deployed on separate machines
+- Network communication allows distributed deployment
+- Configuration system supports cluster setups
+
+### Resource Management
+- GPU memory monitoring and cleanup
+- Process health checks and automatic restart
+- Queue-based job management prevents resource exhaustion
+
+## Security Architecture
+
+### Authentication
+- Secure password hashing with SHA-256
+- Session-based authentication with configurable timeouts
+- API token system for programmatic access
+- Email verification for account activation
+
+### Authorization
+- Role-based access control (user/admin)
+- Resource ownership validation
+- API rate limiting and abuse prevention
+
+### Data Protection
+- Input validation and sanitization
+- Secure file upload handling
+- Database query parameterization
+- Sensitive data encryption in configuration
+
+## Deployment Options
+
+### Single Machine
+- All processes run on one machine
+- Shared memory communication via Unix sockets
+- SQLite database for simplicity
+
+### Multi-Machine Cluster
+- Processes distributed across multiple servers
+- TCP socket communication
+- Shared database server (PostgreSQL/MySQL)
+- Load balancer for web interface scaling
+
+### Cloud Deployment
+- Containerized deployment with Docker
+- Kubernetes orchestration for scaling
+- Cloud storage integration
+- Managed database services
+
+## Monitoring and Logging
+
+### Health Checks
+- Process status monitoring
+- Worker availability tracking
+- Queue depth monitoring
+- Resource utilization tracking
+
+### Logging
+- Structured logging with configurable levels
+- Error tracking and alerting
+- Performance metrics collection
+- Audit logging for security events
+
+## Future Enhancements
+
+### Planned Improvements
+- Kubernetes operator for automated scaling
+- Advanced load balancing algorithms
+- Real-time progress streaming
+- Plugin system for custom analysis modules
+- Multi-cloud GPU support
+
+### Extensibility Points
+- Worker plugin interface
+- Custom authentication providers
+- Payment processor plugins
+- Storage backend abstraction
\ No newline at end of file

requirements-cuda.txt

@@ -5,4 +5,5 @@ opencv-python>=4.5.0
 psutil>=5.8.0
 pynvml>=11.0.0
 flash-attn>=2.0.0
-pyinstaller>=5.0.0
+pyinstaller>=5.0.0
\ No newline at end of file
+PyMySQL>=1.0.0
\ No newline at end of file

requirements-rocm.txt

@@ -4,4 +4,5 @@ transformers>=4.30.0
 opencv-python>=4.5.0
 psutil>=5.8.0
 pynvml>=11.0.0
-pyinstaller>=5.0.0
+pyinstaller>=5.0.0
\ No newline at end of file
+PyMySQL>=1.0.0
\ No newline at end of file

requirements.txt

@@ -5,4 +5,5 @@ opencv-python>=4.5.0
 psutil>=5.8.0
 pynvml>=11.0.0
 flash-attn>=2.0.0
-pyinstaller>=5.0.0
+pyinstaller>=5.0.0
\ No newline at end of file
+PyMySQL>=1.0.0
\ No newline at end of file

vidai/auth.py

@@ -109,4 +109,16 @@ def api_authenticate(token: str) -> Optional[Dict[str, Any]]:
 def generate_api_token(user_id: int) -> str:
     """Generate API token for user."""
     from .database import create_api_token
-    return create_api_token(user_id)
+    return create_api_token(user_id)
\ No newline at end of file
+
+
+def register_user(username: str, password: str, email: str) -> tuple[bool, str]:
+    """Register a new user with email confirmation."""
+    from .database import register_user as db_register_user
+    return db_register_user(username, password, email)
+
+
+def confirm_email(token: str) -> bool:
+    """Confirm user email with token."""
+    from .database import confirm_email as db_confirm_email
+    return db_confirm_email(token)
\ No newline at end of file

vidai/config.py

@@ -249,5 +249,127 @@ def get_all_settings() -> dict:
         'cluster_port': int(config.get('cluster_port', '5003')),
         'cluster_token': config.get('cluster_token', ''),
         'cluster_client': config.get('cluster_client', 'false').lower() == 'true',
-        'system_prompt': get_system_prompt_content()
-    }
+        'system_prompt': get_system_prompt_content(),
+        # New settings for registration and payments
\ No newline at end of file
+        'allow_registration': config.get('allow_registration', 'true').lower() == 'true',
+        'default_user_tokens': int(config.get('default_user_tokens', '100')),
+        'token_price_usd': float(config.get('token_price_usd', '0.10')),
+        'smtp_server': config.get('smtp_server', 'smtp.gmail.com'),
+        'smtp_port': int(config.get('smtp_port', '587')),
+        'smtp_username': config.get('smtp_username', ''),
+        'smtp_use_tls': config.get('smtp_use_tls', 'true').lower() == 'true',
+        'smtp_use_ssl': config.get('smtp_use_ssl', 'false').lower() == 'true',
+        'stripe_publishable_key': config.get('stripe_publishable_key', ''),
+        'paypal_client_id': config.get('paypal_client_id', ''),
+        'btc_payment_address': config.get('btc_payment_address', ''),
+        'eth_payment_address': config.get('eth_payment_address', ''),
+        'base_url': config.get('base_url', 'http://localhost:5000'),
+        # Database settings
+        'db_type': config.get('db_type', 'sqlite'),
+        'db_sqlite_path': config.get('db_sqlite_path', 'vidai.db'),
+        'db_mysql_host': config.get('db_mysql_host', 'localhost'),
+        'db_mysql_port': int(config.get('db_mysql_port', '3306')),
+        'db_mysql_user': config.get('db_mysql_user', 'vidai'),
+        'db_mysql_password': config.get('db_mysql_password', ''),
+        'db_mysql_database': config.get('db_mysql_database', 'vidai'),
+        'db_mysql_charset': config.get('db_mysql_charset', 'utf8mb4')
+    }
+
+
+# Registration and user management settings
+def set_allow_registration(allow: bool) -> None:
+    """Enable/disable user registration."""
+    set_config('allow_registration', 'true' if allow else 'false')
+
+
+def get_allow_registration() -> bool:
+    """Check if user registration is allowed."""
+    return get_config('allow_registration', 'true').lower() == 'true'
+
+
+def set_default_user_tokens(tokens: int) -> None:
+    """Set default token allocation for new users."""
+    set_config('default_user_tokens', str(tokens))
+
+
+def get_default_user_tokens() -> int:
+    """Get default token allocation for new users."""
+    return int(get_config('default_user_tokens', '100'))
+
+
+def set_token_price(price: float) -> None:
+    """Set price per token in USD."""
+    set_config('token_price_usd', str(price))
+
+
+def get_token_price() -> float:
+    """Get price per token in USD."""
+    return float(get_config('token_price_usd', '0.10'))
+
+
+# Email settings
+def set_smtp_server(server: str) -> None:
+    """Set SMTP server."""
+    set_config('smtp_server', server)
+
+
+def set_smtp_port(port: int) -> None:
+    """Set SMTP port."""
+    set_config('smtp_port', str(port))
+
+
+def set_smtp_credentials(username: str, password: str) -> None:
+    """Set SMTP credentials."""
+    set_config('smtp_username', username)
+    set_config('smtp_password', password)
+
+
+def set_smtp_security(use_tls: bool, use_ssl: bool) -> None:
+    """Set SMTP security options."""
+    set_config('smtp_use_tls', 'true' if use_tls else 'false')
+    set_config('smtp_use_ssl', 'true' if use_ssl else 'false')
+
+
+# Payment settings
+def set_stripe_keys(publishable_key: str, secret_key: str) -> None:
+    """Set Stripe API keys."""
+    set_config('stripe_publishable_key', publishable_key)
+    set_config('stripe_secret_key', secret_key)
+
+
+def set_paypal_credentials(client_id: str, client_secret: str) -> None:
+    """Set PayPal credentials."""
+    set_config('paypal_client_id', client_id)
+    set_config('paypal_client_secret', client_secret)
+
+
+def set_crypto_addresses(btc_address: str, eth_address: str) -> None:
+    """Set cryptocurrency payment addresses."""
+    set_config('btc_payment_address', btc_address)
+    set_config('eth_payment_address', eth_address)
+
+
+def set_base_url(url: str) -> None:
+    """Set base URL for the application."""
+    set_config('base_url', url)
+
+
+# Database settings
+def set_db_type(db_type: str) -> None:
+    """Set database type (sqlite or mysql)."""
+    set_config('db_type', db_type)
+
+
+def set_db_sqlite_path(path: str) -> None:
+    """Set SQLite database path."""
+    set_config('db_sqlite_path', path)
+
+
+def set_db_mysql_config(host: str, port: int, user: str, password: str, database: str, charset: str = 'utf8mb4') -> None:
+    """Set MySQL database configuration."""
+    set_config('db_mysql_host', host)
+    set_config('db_mysql_port', str(port))
+    set_config('db_mysql_user', user)
+    set_config('db_mysql_password', password)
+    set_config('db_mysql_database', database)
+    set_config('db_mysql_charset', charset)
\ No newline at end of file

vidai/payments.py

+# Video AI Payment Processing Module
+# Copyright (C) 2024 Stefy Lanza <stefy@sexhack.me>
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+"""
+Payment processing for Video AI token purchases.
+Supports Stripe (credit cards), PayPal, and cryptocurrency payments.
+"""
+
+import time
+import json
+from typing import Dict, Any, Optional, Tuple, List
+from .config import get_config
+from .database import update_user_tokens
+from .email import send_payment_confirmation
+
+
+class PaymentProcessor:
+    """Base class for payment processors."""
+
+    def __init__(self):
+        self.name = "Base"
+        self.enabled = False
+
+    def process_payment(self, user_id: int, tokens: int, amount: float, currency: str = 'USD') -> Tuple[bool, str, Optional[str]]:
+        """Process a payment. Returns (success, message, transaction_id)"""
+        raise NotImplementedError
+
+    def create_payment_intent(self, tokens: int, amount: float) -> Optional[Dict[str, Any]]:
+        """Create a payment intent for frontend integration."""
+        return None
+
+
+class StripeProcessor(PaymentProcessor):
+    """Stripe payment processor for credit cards."""
+
+    def __init__(self):
+        super().__init__()
+        self.name = "Stripe"
+        self.secret_key = get_config('stripe_secret_key', '')
+        self.publishable_key = get_config('stripe_publishable_key', '')
+        self.enabled = bool(self.secret_key and self.publishable_key)
+
+        if self.enabled:
+            try:
+                import stripe
+                stripe.api_key = self.secret_key
+            except ImportError:
+                self.enabled = False
+                print("Stripe not available. Install with: pip install stripe")
+
+    def process_payment(self, user_id: int, tokens: int, amount: float, currency: str = 'USD') -> Tuple[bool, str, Optional[str]]:
+        """Process Stripe payment."""
+        if not self.enabled:
+            return False, "Stripe payment processing not configured", None
+
+        try:
+            import stripe
+
+            # Create payment intent
+            intent = stripe.PaymentIntent.create(
+                amount=int(amount * 100),  # Convert to cents
+                currency=currency.lower(),
+                metadata={
+                    'user_id': str(user_id),
+                    'tokens': str(tokens)
+                }
+            )
+
+            return True, "Payment intent created", intent.id
+
+        except Exception as e:
+            return False, f"Payment processing failed: {str(e)}", None
+
+    def create_payment_intent(self, tokens: int, amount: float) -> Optional[Dict[str, Any]]:
+        """Create Stripe payment intent for frontend."""
+        if not self.enabled:
+            return None
+
+        try:
+            import stripe
+
+            intent = stripe.PaymentIntent.create(
+                amount=int(amount * 100),
+                currency='usd',
+                metadata={'tokens': str(tokens)}
+            )
+
+            return {
+                'client_secret': intent.client_secret,
+                'amount': amount,
+                'tokens': tokens
+            }
+
+        except Exception as e:
+            print(f"Stripe payment intent creation failed: {e}")
+            return None
+
+
+class PayPalProcessor(PaymentProcessor):
+    """PayPal payment processor."""
+
+    def __init__(self):
+        super().__init__()
+        self.name = "PayPal"
+        self.client_id = get_config('paypal_client_id', '')
+        self.client_secret = get_config('paypal_client_secret', '')
+        self.enabled = bool(self.client_id and self.client_secret)
+
+        if self.enabled:
+            try:
+                # PayPal SDK would go here
+                pass
+            except ImportError:
+                self.enabled = False
+
+    def process_payment(self, user_id: int, tokens: int, amount: float, currency: str = 'USD') -> Tuple[bool, str, Optional[str]]:
+        """Process PayPal payment."""
+        if not self.enabled:
+            return False, "PayPal payment processing not configured", None
+
+        # PayPal integration would go here
+        # For now, return placeholder
+        return False, "PayPal integration coming soon", None
+
+
+class CryptoProcessor(PaymentProcessor):
+    """Cryptocurrency payment processor."""
+
+    def __init__(self):
+        super().__init__()
+        self.name = "Cryptocurrency"
+        self.btc_address = get_config('btc_payment_address', '')
+        self.eth_address = get_config('eth_payment_address', '')
+        self.enabled = bool(self.btc_address or self.eth_address)
+
+    def process_payment(self, user_id: int, tokens: int, amount: float, currency: str = 'USD') -> Tuple[bool, str, Optional[str]]:
+        """Process cryptocurrency payment."""
+        if not self.enabled:
+            return False, "Cryptocurrency payments not configured", None
+
+        # Generate payment addresses and instructions
+        transaction_id = f"crypto_{user_id}_{int(time.time())}"
+
+        payment_info = {
+            'transaction_id': transaction_id,
+            'amount_usd': amount,
+            'tokens': tokens,
+            'btc_address': self.btc_address,
+            'eth_address': self.eth_address,
+            'status': 'pending'
+        }
+
+        # In a real implementation, you'd store this in database
+        # and provide webhook endpoint for payment confirmation
+
+        return True, "Cryptocurrency payment initiated. Please send payment to provided address.", transaction_id
+
+
+# Global payment processors
+stripe_processor = StripeProcessor()
+paypal_processor = PayPalProcessor()
+crypto_processor = CryptoProcessor()
+
+
+def get_available_processors() -> Dict[str, PaymentProcessor]:
+    """Get all available payment processors."""
+    return {
+        'stripe': stripe_processor,
+        'paypal': paypal_processor,
+        'crypto': crypto_processor
+    }
+
+
+def process_payment(user_id: int, processor_name: str, tokens: int, amount: float) -> Tuple[bool, str, Optional[str]]:
+    """Process payment using specified processor."""
+    processors = get_available_processors()
+
+    if processor_name not in processors:
+        return False, "Payment processor not found", None
+
+    processor = processors[processor_name]
+    success, message, transaction_id = processor.process_payment(user_id, tokens, amount)
+
+    if success and transaction_id:
+        # Add tokens to user account
+        if update_user_tokens(user_id, tokens):
+            # Send confirmation email
+            from .database import get_user_by_id
+            user = get_user_by_id(user_id)
+            if user and user.get('email'):
+                send_payment_confirmation(user['email'], user['username'], tokens, amount, processor.name)
+            return True, f"Payment successful! {tokens} tokens added to your account.", transaction_id
+        else:
+            return False, "Payment processed but token update failed", transaction_id
+
+    return success, message, transaction_id
+
+
+def create_payment_intent(processor_name: str, tokens: int, amount: float) -> Optional[Dict[str, Any]]:
+    """Create payment intent for frontend integration."""
+    processors = get_available_processors()
+
+    if processor_name not in processors:
+        return None
+
+    processor = processors[processor_name]
+    return processor.create_payment_intent(tokens, amount)
+
+
+def get_token_packages() -> List[Dict[str, Any]]:
+    """Get available token packages."""
+    return [
+        {'tokens': 100, 'price': 10.00, 'popular': False},
+        {'tokens': 250, 'price': 22.50, 'popular': False},
+        {'tokens': 500, 'price': 40.00, 'popular': True},
+        {'tokens': 1000, 'price': 70.00, 'popular': False},
+        {'tokens': 2500, 'price': 150.00, 'popular': False},
+    ]
+
+
+def calculate_price(tokens: int) -> float:
+    """Calculate price for given number of tokens."""
+    from .database import get_token_price
+    return tokens * get_token_price()
\ No newline at end of file