api-changelog-versioning

# API Changelog
 
## Version 3.0.0 - 2025-01-15
 
### 🚨 Breaking Changes
 
#### Authentication Method Changed
 
**Previous (v2):**
 
```http
GET /api/users
Authorization: Token abc123
```
 
## Reference Guides
 
Detailed implementations in the `references/` directory:
 
| Guide | Contents |
|---|---|
| [🚨 Breaking Changes](references/breaking-changes.md) | 🚨 Breaking Changes |
| [✨ New Features](references/new-features.md) | ✨ New Features |
| [🔧 Improvements](references/improvements.md) | 🔧 Improvements |
| [🔒 Security](references/security.md) | 🔒 Security, 🗑️ Deprecated, 📊 Version Support Policy |
| [Step 1: Update Base URL](references/step-1-update-base-url.md) | Step 1: Update Base URL, Step 2: Migrate Authentication, Step 3: Update Response Parsing, Step 4: Update Error Handling (+2 more) |
 
## Best Practices
 
### ✅ DO
 
- Clearly mark breaking changes
- Provide migration guides with code examples
- Include before/after comparisons
- Document deprecation timelines
- Show impact on existing implementations
- Provide SDKs for major versions
- Use semantic versioning
- Give advance notice (3-6 months)
- Maintain backward compatibility when possible
- Document version support policy
 
### ❌ DON'T
 
- Make breaking changes without notice
- Remove endpoints without deprecation period
- Skip migration examples
- Forget to version your API
- Change behavior without documentation
- Rush deprecations