1. Introduction
3. Architecture
4. 1. Microservices Architecture
5. 2. Project Structure Guide
7. Modules
8. 3. Admin Manage Module
   1. 3.1. Admin Account System
   2. 3.2. Role-based Access Control
   3. 3.3. Authentication & Audit
9. 4. Auth Module
   1. 4.1. User Account System
   2. 4.2. Session Management
   3. 4.3. Register Flow
   4. 4.4. Password Reset Flow
   5. 4.5. Authentication for Other Modules
10. 5. Telecom Module
    1. 5.1. Node Server
    2. 5.2. Node Client
    3. 5.3. Version Control of Packages
    4. 5.4. Package Queue
    5. 5.5. Usage Recording Flow
    6. 5.6. Observability
    7. 5.7. Fetching Config
11. 6. Market Module
    1. 6.1. Affiliate System
12. 7. Shop Module
    1. 7.1. Production
    2. 7.2. Order System
    3. 7.3. Ordering Flow
    4. 7.4. Account Balance
    5. 7.5. Coupon
    6. 7.6. EPay Support
    7. 7.7. Gift Card
13. 8. Notification Module
    1. 8.1. Announcement
    2. 8.2. Notification Settings
14. 9. Support Module
    1. 9.1. Ticket System
15. 10. Email Sender
16. 11. Built-in WAF
    1. 11.1. Rate Limiter
    2. 11.2. Hashcash Captcha
    3. 11.3. Anti-XSS
18. Frontend
19. 12. Basic Design
20. 13. Admin Dashboard
21. 14. User Web Application
23. Deployment
24. 15. helium-server Crate
25. 16. External Dependency
26. 17. Observability with OpenTelemetry
27. 18. Health Checks for Kubernetes
28. 19. Docker-based Deployment
29. 20. Configure
30. 21. Helium CLI
32. Migration
33. 22. Migrate From SS-Panel UIM