---
since: 0.6.0
---

# Integration Boundaries

The issue tracker should isolate external integrations behind explicit
interfaces.

```text
Issue Tracker
      │
      ├── Email
      │
      ├── Webhooks
      │
      ├── SSO / identity
      │
      ├── Storage
      │
      └── Background workers
```

## Principle

External services should not leak provider-specific details throughout the
domain layer.

Prefer:

```text
domain/service
      │
      ▼
integration interface
      │
      ▼
provider implementation
```

This keeps provider replacement and testing manageable.