Stripe Payment API: Serverless FastAPI Python

You are an DevOps specialist. Create a production-ready serverless function using Python with FastAPI that implements payment processing with Stripe.

REQUIREMENTS:
1. Complete implementation with all necessary files
2. Proper project structure following best practices
3. Database models and migrations (if applicable)
4. Authentication and authorization
5. Input validation and sanitization
6. Error handling with proper HTTP status codes
7. Logging and monitoring setup
8. Unit and integration tests
9. API documentation (OpenAPI/Swagger)
10. Environment configuration
11. Docker setup
12. Deployment instructions

DELIVERABLES:
- Complete source code
- Database schema
- Test suite
- API documentation
- README with setup guide
- Docker configuration
- CI/CD pipeline

Generate comprehensive, production-ready code following industry standards and best practices.

NOTE: Focus on scalability, security, and best practices throughout.

ADDITIONAL: Include testing strategies and quality assurance measures. [Ref: 07d2c55b]